Some standard content:
Chemical Industry Standard of the People's Republic of China
Food Additives
Diluted Benzoyl Peroxide
Subject Content and Scope of Application
HG 2684-95
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of diluted benzoyl peroxide for food additives.
This standard applies to diluted benzoyl peroxide (also known as flour whitening agent) prepared from food additive benzoyl peroxide and one or more of the food additives alum, calcium phosphate, calcium acid, calcium carbonate, magnesium carbonate and starch as diluents, which is used to improve the quality of wheat flour. Main ingredient: Molecular formula of benzoyl peroxide: (CH, CO), O2 Relative molecular mass of benzoyl peroxide: 242.22 (according to the international relative atomic mass in 1991) 2 Reference standards
Pictorial symbols for packaging, storage and transportation
GB/T 601
GB/T 602
GB/T 603
GB/T 6678
GB/T 8450
GB/T8451
3 Technical requirements
Chemical reagents: Preparation of standard solution for titration analysis (volumetric analysis) Chemical reagents
Preparation of standard solution for impurity determination
Preparation of preparations and products used in the test method Chemical reagents
General rules for sampling of chemical products
Determination of arsenic in food additives
Limit test method for heavy metals in food additives Appearance: white smooth powder.
3.2 Food additives
Diluted benzoyl peroxide should meet the requirements of the following table
Benzoyl peroxide content (Cu,Hi.O,),% moisture,%
Fineness (R40/3 series, Φ200×50/0.075mm test sieve, sieve residue),% Burning test
Hydrochloric acid test
Approved by the Ministry of Chemical Industry of the People's Republic of China on April 5, 1995 136
Implemented on January 1, 1996
Ammonium salt test
Barium salt test|| tt||pH value of 10% aqueous solution
Content of heavy metal (in terms of Pb), %
Content of monument (in terms of As), %
Test method
HG2684-95
6.0～9.0
The reagents and water used in this standard, unless otherwise specified, refer to analytical reagents and distilled water or water of equivalent purity. The standard solutions, impurity standard solutions, preparations and products required by this standard, unless otherwise specified, shall be prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603.
4.1 Identification test
4.1.1 Reagents and solutions
a. Chloroform;
b. 4,4'-Diaminodiphenylamine solution: Add a small amount of ethanol to 4,4'-diaminodiphenylamine sulfate, grind and mix thoroughly, then add ethanol, pass through a reflux condenser, and heat on a water bath to reflux to make a saturated solution. 4.1.2 Analysis steps
Weigh 0.2g of the sample, put it into a test tube, add 7mL of chloroform, shake it thoroughly, and after standing, white insoluble matter should remain at the bottom of the test tube. Add 2mL of 4,4'-diazodiphenylamine solution, and the liquid and insoluble matter should appear blue-green. 4.2 Determination of benzoyl peroxide content
4.2.1 Summary of the method
In acetone solution, benzoyl peroxide reacts with potassium iodide to generate free iodine, which is titrated with sodium thiosulfate standard titration solution. 4.2.2 Reagents and solutions
Acetone;
Potassium iodide solution: 500g/L;
Sodium thiosulfate standard titration solution: c(NazS,O.)=0.1mol/L. 4.2.3 Analysis steps
Weigh 1g of sample (accurate to 0.0002g), place in a 250mL glass conical flask, add 30mL of acetone to dissolve it, add 2mL of potassium iodide solution, and immediately cover the stopper. After shaking well, place in a dark place for 15min, and titrate with sodium thiosulfate standard titration solution (without starch indicator solution) until the brown color disappears as the titration end point. Perform a blank test at the same time. 4.2.4 Expression of analytical results
The benzoyl peroxide content (X,) expressed as mass percentage is calculated according to formula (1): (ViV,)·cX0.121 1
Wherein: V.-the volume of sodium thiosulfate standard titration solution consumed by the sample, mL; X 100.....
HG 2684—95
V2-the volume of sodium thiosulfate standard titration solution consumed by the blank, mL; -the actual concentration of sodium thiosulfate standard titration solution, mol/L; .m-the mass of the sample, g;
0.1211-the mass of benzoyl peroxide in grams equivalent to 1.00mL of sodium thiosulfate standard titration solution [c(NazS,O,)=1.000mol/L].
4.2.5 Allowable difference
The difference between two parallel determination results shall not exceed 0.2%, and the arithmetic mean shall be taken as the determination result. 4.3 Determination of moisture
4.3.1 Instruments and materials
a. Vacuum drying oven;
Weighing bottle, diameter 50mm, height 30mm.
4.3.2 Analysis steps
Weigh 2g of sample (accurate to 0.0002g) in a weighing bottle with constant weight in advance. Place in a vacuum drying oven with a vacuum degree of 6.4×104～7.1×10*Pa (equivalent to 480～530mmHg), dry at 50±2℃ to constant weight, and weigh. 4.3.3 Expression of analysis results
The moisture expressed as mass percentage (X, calculated according to formula (2): X, —
Where: m-
The mass of the sample before drying, m
- The mass of the sample after drying, g.
4.3.4 Permissible difference
The difference between the results of two parallel determinations shall not exceed 0.2%, and the arithmetic mean shall be taken as the determined result. 4.4 Determination of fineness
4.4.1 Test sieve (GB6003): R40/3 series, Φ200mm×50mm/0.075mm. With sieve bottom and sieve cover. 4.4.2 Analysis steps
Weigh 10g of sample (accurate to 0.1g), place it in the test sieve, shake it vigorously for 2min, and keep beating it. Weigh the residue in the test sieve, not more than 1. 0g Qualified.
4.5 Burning test
Weigh 1g of sample (accurate to 0.01g), place it on a glass plate with a height of 3mm and a width of 10mm, ignite it from one end, and it is qualified if the burning does not extend to the other end.
4.6 Hydrochloric acid test
4.6.1 Reagents and solutions
a. Ether;
b. Hydrochloric acid solution: 1→4.
4.6.2 Analysis steps
Weigh 0.2g of sample (accurate to 0.01g), place it in a test tube Add 10mL of hydrochloric acid solution, shake well, heat slowly and boil for about 1min, add 8mL of ether after cooling, shake well and let stand. After separation, the two liquid layers should be clear, and the turbidity should not be greater than the turbidity of the clear standard turbidity solution. It is qualified if there is no significant suspended matter at the interface of the two liquid layers. The preparation of clear standard turbidity solution is shown in Appendix A (Supplement). 4.7 Ammonium salt test
4.7.1 Solution
Sodium hydroxide solution: 400g/L.
4.7.2 Analysis steps
HG 2684-95
Weigh 0.2g of sample (accurate to 0.01g), put it into a test tube, add 3mL of sodium hydroxide solution, heat and boil, test it with moistened red litmus paper at the mouth of the test tube, if it does not turn blue, it is qualified. 4.8 Salt lock test
4.8.1 Solution
a. Nitric acid solution: 1-+10;
b. Sulfuric acid solution: 1-20;
c. Ammonia solution: 2→5.
4.8.2 Analysis steps
Weigh 2g of sample (accurate to 0.01g) , put it in a test tube, add 15mL of nitric acid solution, shake and filter, wash with water, combine the washing liquid and filtrate, add water to 40mL, adjust the pH value to 2.4~~2.8 with ammonia solution, then add water to 50mL, add 1mL of sulfuric acid solution, and after standing for 10 minutes, its turbidity shall not be greater than the turbidity of the turbidity standard turbidity solution. The preparation of turbidity standard turbidity solution is shown in Appendix B (Supplement). 4.9 pH value of 10% aqueous solution
4.9.1 Instrument
Acidity meter with a minimum graduation value of 0.1pH, equipped with a calomel reference electrode and a glass measuring electrode. 4.9.2 Analysis steps
Weigh 3g of sample (accurate to 0.1g), put it in a beaker, add 30mL of water and shake well, filter the solution, and measure the pH value on the acidometer. 4.9.3 Allowable difference
The difference between two parallel determination results shall not exceed 0.2pH, and the arithmetic mean is taken as the determination result. 4.10 Determination of heavy metal content
4.10.1 Solution
a. Hydrochloric acid solution: 1-4;
b. Sodium sulfide solution: weigh 5g of sodium sulfide, dissolve it in 10mL of water, add 30mL of glycerol and shake well, put it in a brown glass bottle, seal it and keep it away from light, and it is valid within three months.
Scale.
Lead standard solution: 0.01mgPb/mL, take 10mL of solution containing 0.1mgPb/mL, dilute to 4.10.2 Preparation of sample solution and lead limit standard solution Weigh 1.0g of sample, add 7mL of hydrochloric acid solution and 10mL of water, shake thoroughly, heat in a 90℃ constant temperature water bath for 30min, filter after cooling, wash with water, combine the washing liquid and filtrate, and add water to 40mL. Take 20mL of this solution as sample solution. Take 2.0mL of lead standard solution and treat it in the same way as the sample solution as lead limit standard solution. 4.10.3 Analysis steps
Perform according to the provisions of GB/T8451. In 6.4, add 10mL of freshly prepared hydrogen sulfide saturated solution to each tube, and add two drops of sodium sulfide solution instead.
4.11 Determination of arsenic content
4.11.1 Solution
a. Hydrochloric acid solution: 1→4;
b. Arsenic standard solution: 0.001mgAs/mL, take 1mL of arsenic standard solution containing 0.1mgAs/mL, add 1mL (3+100) sulfuric acid solution in a 100ml volumetric flask, and dilute to the mark with freshly boiled and cooled water. 4.11.2 Preparation of sample solution and arsenic limit standard solution Weigh 0.33g of sample, add 5mL of hydrochloric acid solution, heat steadily to boiling, quickly cool in ice water and filter, wash the filter residue with 15ml of water, combine the washing liquid and the filtrate, add water to 40mL, this solution is the sample solution. 139
HG2684-95
Take 1.00mL of arsenic standard solution and treat it in the same way as the sample solution, as the arsenic limit standard solution. 4.11.3 Analysis steps
Perform according to the provisions of the arsenic spot method in GB/T8450. 5 Inspection rules
5.1 The quality of the product shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all products leaving the factory meet the requirements of this standard. Each batch of products leaving the factory shall be accompanied by a quality certificate, the contents of which include: product name, this standard number, proof that the product quality meets this standard, production license number, food hygiene license number, production date, batch number, net weight, quality inspector, storage period, manufacturer name and address. 5.2 The user has the right to inspect and accept the received products in accordance with the provisions of this standard. 5.3 A batch of uniform products produced at one time. 5.4 Determine the number of sampling units in accordance with Article 6.6 of GB/T6678. When sampling, take samples from a small bag in each barrel, with each small bag being no less than 50g. Mix the samples thoroughly, and reduce them to no less than 200g by quartering, and put them into two dry, clean, and airtight glass bottles. Paste labels on the bottles and indicate: manufacturer name, product name, batch number, sampling date, and name of the sampler. One bottle is for inspection, and the other bottle is kept for future reference.
5.5 If one of the indicators in the inspection results does not meet the requirements of this standard, re-sample from twice the amount of packaging barrels for inspection. If there is still an indicator that does not meet the requirements of this standard in the re-inspection results, the entire batch of products is unqualified. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 6 Marking, packaging, transportation and storage
6.1 Each packaging container should have the words "food additive" clearly marked, and indicate the product name, production license number, trademark, batch number, production date, net weight, manufacturer name and address, this standard number and the "wet-afraid" mark specified in GB191. 6.2 This product is packaged in a hard barrel lined with food-grade plastic bags, with 5 small bags packed in food-grade plastic bags inside, each small bag has a net weight of 5kg, and each barrel has a net weight of 25kg, or it can be packaged according to user requirements. The barrel is accompanied by a product instruction manual. 6.3 This product should be covered during transportation to prevent rain and moisture. It is strictly forbidden to mix it with harmful substances. 6.4 This product should be stored in a cool, dry and ventilated warehouse to prevent heat or sunlight exposure. It is strictly forbidden to mix it with toxic and harmful substances. 6.5 The storage period of this product is two years. If it is overdue, it must be re-inspected to see if it meets the requirements of this standard. Those that meet the requirements can continue to be used. 140
A1 Reagents and solutions
Nitric acid solution: 1-→3;
Dextrin solution: 20g/1.;wwW.bzxz.Net
Silver nitrate solution: 20g/L;
HG 2684-95
Appendix A
Preparation of clear standard turbidimetric solution
(Supplement)
d Hydrochloric acid standard solution: c(HCl)=0.1mol/L. A2 Preparation of standard turbidimetric solution
A2.1 Preparation of solution containing 1mg of chlorine (Cl) per 1mL Take 14.1mL of hydrochloric acid standard solution, place it in a 50mL volumetric flask, and dilute to the mark with water. A2.2 Preparation of a solution containing 0.01 mg of chlorine (Cl) per 1 mL Measure 10 mL of a solution containing 1 mg of chlorine (Cl) per 1 mL, place it in a 1000 mL volumetric flask, and dilute to the mark with water. A2.3 Preparation of a clear standard turbidity solution
Accurately measure 0.2 mL of a solution containing 0.01 mg of chlorine (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution, and 1 mL of silver nitrate solution, shake well, and place in a dark place for 15 minutes. Appendix B
Preparation of turbid standard turbidimetric solution
(Supplement)
B1 Reagents and solutions
Nitric acid solution: 1-3;
Dextrin solution: 20g/l.;
Silver nitrate solution: 20g/L;
d Hydrochloric acid standard solution: c(HCI)=0. 1mol/L. B2 Preparation of standard turbidimetric solution
B2.1 Preparation of solution containing 1mg of fluorine (Cl) per 1ml Take 14.1mL of hydrochloric acid standard solution, place it in a 50mL volumetric flask, and dilute to the mark with water. B2.2 Preparation of turbid standard turbidity solution
Accurately measure 0.3 mL of a solution containing 1 mg of nitrogen (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution and 1 ml of silver nitrate solution. Shake well and place in a dark place for 15 minutes. Additional remarks:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical jurisdiction of the Beijing Chemical Research Institute of the Ministry of Chemical Industry and the Food Hygiene Supervision and Inspection Institute of the Ministry of Health. This standard was drafted by the First Branch of Xuchang Pharmaceutical Factory, Henan Province and the Nuclear Industry Physical and Chemical Engineering Research Institute. The main drafters of this standard are Xia Shujun, Zhao Qitai, Zhang Genyi and Xue Jiangfeng. This standard is equivalent to the fifth edition of the "Japanese Food Additive Code" (1986) "Diluted Benzoyl Peroxide". 1411mL of arsenic standard solution with 1mgAs/mL, add 1mL (3+100) sulfuric acid solution in a 100mL volumetric flask, and dilute to the mark with freshly boiled and cooled water. 4.11.2 Preparation of sample solution and arsenic limit standard solution Weigh 0.33g of sample, add 5mL of hydrochloric acid solution, heat steadily to boiling, quickly cool in ice water and filter, wash the filter residue with 15mL of water, combine the washing liquid and filtrate, add water to make up to 40mL, this solution is the sample solution. 139
HG2684-95
Pull 1.00mL of arsenic standard solution and treat it in the same way as the sample solution, as the arsenic limit standard solution. 4.11.3 Analysis steps
Perform according to the provisions of the arsenic spot method in GB/T8450. 5 Inspection rules
5.1 The quality supervision and inspection department of the manufacturer shall inspect the product quality in accordance with the provisions of this standard. The manufacturer shall ensure that all products shipped out of the factory meet the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate, which includes: product name, this standard number, proof that the product quality meets this standard, production license number, food hygiene license number, production date, batch number, net weight, quality inspector, storage period, manufacturer name and address. 5.2 The user has the right to inspect and accept the received products in accordance with the provisions of this standard. 5.3 A uniform product produced at one time is a batch. 5.4 Determine the number of sampling units in accordance with Article 6.6 of GB/T6678. When sampling, take samples from a small bag in each barrel, each small bag should be no less than 50g, mix the samples thoroughly, reduce them to no less than 200g by quartering, and put them into two dry, clean, and sealed glass bottles respectively. Label the bottles and indicate: manufacturer name, product name, batch number, sampling date and name of the sampler. One bottle is for inspection and the other bottle is kept for future reference.
5.5 If one of the indicators in the test results does not meet the requirements of this standard, re-sample from the packaging barrel with twice the amount. If one of the indicators in the re-examination results still does not meet the requirements of this standard, the entire batch of products is unqualified. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 6 Marking, packaging, transportation and storage
6.1 Each packaging container should have the words "food additives" clearly marked, and indicate the product name, production license number, trademark, batch number, production date, net weight, manufacturer name and address, this standard number and the "wet-afraid" mark specified in GB191. 6.2 This product is packaged in a hard barrel lined with food-grade plastic bags, with 5 small bags packed in food-grade plastic bags inside, each small bag has a net weight of 5kg, and each barrel has a net weight of 25kg, or it can be packaged according to user requirements. The product instruction manual is attached to the barrel. 6.3 This product should be covered during transportation to prevent rain and moisture. It is strictly forbidden to mix it with harmful substances. 6.4 This product should be stored in a cool, dry and ventilated warehouse to prevent heat or sunlight exposure. It is strictly forbidden to mix it with toxic and harmful substances. 6.5 The storage period of this product is two years. If it is overdue, it should be re-inspected to see if it meets the requirements of this standard. Those that meet the requirements can continue to be used. 140
A1 Reagents and solutions
Nitric acid solution: 1-→3;
Dextrin solution: 20g/1.;
Silver nitrate solution: 20g/L;
HG 2684-95
Appendix A
Preparation of clear standard turbidity solution
(Supplement)
d Hydrochloric acid standard solution: c(HCl)=0.1mol/L. A2 Preparation of standard turbidity solution
A2.1 Preparation of solution containing 1 mg of chlorine (Cl) per 1 mL Measure 14.1 mL of standard hydrochloric acid solution, place it in a 50 mL volumetric flask, and dilute to the mark with water. A2.2 Preparation of solution containing 0.01 mg of chlorine (Cl) per 1 mL Measure 10 mL of solution containing 1 mg of chlorine (Cl) per 1 mL, place it in a 1000 mL volumetric flask, and dilute to the mark with water. A2.3 Preparation of clear standard turbidity solution
Accurately measure 0.2 mL of solution containing 0.01 mg of chlorine (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution, and 1 mL of silver nitrate solution, shake well, and place in a dark place for 15 minutes. Appendix B
Preparation of turbid standard turbidimetric solution
(Supplement)
B1 Reagents and solutions
Nitric acid solution: 1-3;
Dextrin solution: 20g/l.;
Silver nitrate solution: 20g/L;
d Hydrochloric acid standard solution: c(HCI)=0. 1mol/L. B2 Preparation of standard turbidimetric solution
B2.1 Preparation of solution containing 1mg of fluorine (Cl) per 1ml Take 14.1mL of hydrochloric acid standard solution, place it in a 50mL volumetric flask, and dilute to the mark with water. B2.2 Preparation of turbid standard turbidity solution
Accurately measure 0.3 mL of a solution containing 1 mg of nitrogen (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution and 1 ml of silver nitrate solution. Shake well and place in a dark place for 15 minutes. Additional remarks:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical jurisdiction of the Beijing Chemical Research Institute of the Ministry of Chemical Industry and the Food Hygiene Supervision and Inspection Institute of the Ministry of Health. This standard was drafted by the First Branch of Xuchang Pharmaceutical Factory, Henan Province and the Nuclear Industry Physical and Chemical Engineering Research Institute. The main drafters of this standard are Xia Shujun, Zhao Qitai, Zhang Genyi and Xue Jiangfeng. This standard is equivalent to the fifth edition of the "Japanese Food Additive Code" (1986) "Diluted Benzoyl Peroxide". 1411mL of arsenic standard solution with 1mgAs/mL, add 1mL (3+100) sulfuric acid solution in a 100mL volumetric flask, and dilute to the mark with freshly boiled and cooled water. 4.11.2 Preparation of sample solution and arsenic limit standard solution Weigh 0.33g of sample, add 5mL of hydrochloric acid solution, heat steadily to boiling, quickly cool in ice water and filter, wash the filter residue with 15mL of water, combine the washing liquid and filtrate, add water to make up to 40mL, this solution is the sample solution. 139
HG2684-95
Pull 1.00mL of arsenic standard solution and treat it in the same way as the sample solution, as the arsenic limit standard solution. 4.11.3 Analysis steps
Perform according to the provisions of the arsenic spot method in GB/T8450. 5 Inspection rules
5.1 The quality supervision and inspection department of the manufacturer shall inspect the product quality in accordance with the provisions of this standard. The manufacturer shall ensure that all products shipped out of the factory meet the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate, which includes: product name, this standard number, proof that the product quality meets this standard, production license number, food hygiene license number, production date, batch number, net weight, quality inspector, storage period, manufacturer name and address. 5.2 The user has the right to inspect and accept the received products in accordance with the provisions of this standard. 5.3 A uniform product produced at one time is a batch. 5.4 Determine the number of sampling units in accordance with Article 6.6 of GB/T6678. When sampling, take samples from a small bag in each barrel, each small bag should be no less than 50g, mix the samples thoroughly, reduce them to no less than 200g by quartering, and put them into two dry, clean, and sealed glass bottles respectively. Label the bottles and indicate: manufacturer name, product name, batch number, sampling date and name of the sampler. One bottle is for inspection and the other bottle is kept for future reference.
5.5 If one of the indicators in the test results does not meet the requirements of this standard, re-sample from the packaging barrel with twice the amount. If one of the indicators in the re-examination results still does not meet the requirements of this standard, the entire batch of products is unqualified. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 6 Marking, packaging, transportation and storage
6.1 Each packaging container should have the words "food additives" clearly marked, and indicate the product name, production license number, trademark, batch number, production date, net weight, manufacturer name and address, this standard number and the "wet-afraid" mark specified in GB191. 6.2 This product is packaged in a hard barrel lined with food-grade plastic bags, with 5 small bags packed in food-grade plastic bags inside, each small bag has a net weight of 5kg, and each barrel has a net weight of 25kg, or it can be packaged according to user requirements. The product instruction manual is attached to the barrel. 6.3 This product should be covered during transportation to prevent rain and moisture. It is strictly forbidden to mix it with harmful substances. 6.4 This product should be stored in a cool, dry and ventilated warehouse to prevent heat or sunlight exposure. It is strictly forbidden to mix it with toxic and harmful substances. 6.5 The storage period of this product is two years. If it is overdue, re-inspect whether it meets the requirements of this standard. Those that meet the requirements can continue to be used. 140
A1 Reagents and solutions
Nitric acid solution: 1-→3;
Dextrin solution: 20g/1.;
Silver nitrate solution: 20g/L;
HG 2684-95
Appendix A
Preparation of clear standard turbidity solution
(Supplement)
d Hydrochloric acid standard solution: c(HCl)=0.1mol/L. A2 Preparation of standard turbidity solution
A2.1 Preparation of solution containing 1 mg of chlorine (Cl) per 1 mL Measure 14.1 mL of standard hydrochloric acid solution, place it in a 50 mL volumetric flask, and dilute to the mark with water. A2.2 Preparation of solution containing 0.01 mg of chlorine (Cl) per 1 mL Measure 10 mL of solution containing 1 mg of chlorine (Cl) per 1 mL, place it in a 1000 mL volumetric flask, and dilute to the mark with water. A2.3 Preparation of clear standard turbidity solution
Accurately measure 0.2 mL of solution containing 0.01 mg of chlorine (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution, and 1 mL of silver nitrate solution, shake well, and place in a dark place for 15 minutes. Appendix B
Preparation of turbid standard turbidimetric solution
(Supplement)
B1 Reagents and solutions
Nitric acid solution: 1-3;
Dextrin solution: 20g/l.;
Silver nitrate solution: 20g/L;
d Hydrochloric acid standard solution: c(HCI)=0. 1mol/L. B2 Preparation of standard turbidimetric solution
B2.1 Preparation of solution containing 1mg of fluorine (Cl) per 1ml Take 14.1mL of hydrochloric acid standard solution, place it in a 50mL volumetric flask, and dilute to the mark with water. B2.2 Preparation of turbid standard turbidity solution
Accurately measure 0.3 mL of a solution containing 1 mg of nitrogen (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution and 1 ml of silver nitrate solution. Shake well and place in a dark place for 15 minutes. Additional remarks:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical jurisdiction of the Beijing Chemical Research Institute of the Ministry of Chemical Industry and the Food Hygiene Supervision and Inspection Institute of the Ministry of Health. This standard was drafted by the First Branch of Xuchang Pharmaceutical Factory, Henan Province and the Nuclear Industry Physical and Chemical Engineering Research Institute. The main drafters of this standard are Xia Shujun, Zhao Qitai, Zhang Genyi and Xue Jiangfeng. This standard is equivalent to the fifth edition of the "Japanese Food Additive Code" (1986) "Diluted Benzoyl Peroxide". 141;
Silver nitrate solution: 20g/L;
HG 2684-95
Appendix A
Preparation of clear standard turbidimetric solution
(Supplement)
d Hydrochloric acid standard solution: c(HCl)=0.1mol/L. A2 Preparation of standard turbidimetric solution
A2.1 Preparation of a solution containing 1mg of chlorine (Cl) per 1mL Measure 14.1mL of hydrochloric acid standard solution, place it in a 50mL volumetric flask, and dilute to the mark with water. A2.2 Preparation of a solution containing 0.01mg of chlorine (Cl) per 1mL Measure 10mL of a solution containing 1mg of chlorine (Cl) per 1mL, place it in a 1000mL volumetric flask, and dilute to the mark with water. A2.3 Preparation of clear standard turbidity solution
Accurately measure 0.2 mL of a solution containing 0.01 mg of chlorine (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution and 1 mL of silver nitrate solution, shake well, and place in a dark place for 15 min. Appendix B
Preparation of turbid standard turbidity solution
(Supplement)
B1 Reagents and solutions
Nitric acid solution: 1-3;
Dextrin solution: 20 g/l.;
Silver nitrate solution: 20 g/L;
d Hydrochloric acid standard solution: c(HCI)=0. 1 mol/L. B2 Preparation of standard turbidity solution
B2.1 Preparation of solution containing 1 mg of fluorine (Cl) per 1 ml Measure 14.1 mL of standard hydrochloric acid solution, place it in a 50 mL volumetric flask, and dilute it to the mark with water. B2.2 Preparation of standard turbidity solution
Accurately measure 0.3 mL of solution containing 1 mg of nitrogen (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution and 1 mL of silver nitrate solution. Shake well and place in a dark place for 15 minutes. Additional remarks:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical jurisdiction of the Beijing Chemical Industry Research Institute of the Ministry of Chemical Industry and the Food Sanitation Supervision and Inspection Institute of the Ministry of Health. This standard was drafted by the First Branch of Xuchang Pharmaceutical Factory, Henan Province and the Nuclear Industry Physical and Chemical Engineering Research Institute. The main drafters of this standard are Xia Shujun, Zhao Qitai, Zhang Genyi and Xue Jiangfeng. This standard is equivalent to the fifth edition (1986) of the "Japanese Food Additive Code" "Diluted Benzoyl Peroxide".;
Silver nitrate solution: 20g/L;
HG 2684-95
Appendix A
Preparation of clear standard turbidimetric solution
(Supplement)
d Hydrochloric acid standard solution: c(HCl)=0.1mol/L. A2 Preparation of standard turbidimetric solution
A2.1 Preparation of a solution containing 1mg of chlorine (Cl) per 1mL Measure 14.1mL of hydrochloric acid standard solution, place it in a 50mL volumetric flask, and dilute to the mark with water. A2.2 Preparation of a solution containing 0.01mg of chlorine (Cl) per 1mL Measure 10mL of a solution containing 1mg of chlorine (Cl) per 1mL, place it in a 1000mL volumetric flask, and dilute to the mark with water. A2.3 Preparation of clear standard turbidity solution
Accurately measure 0.2 mL of a solution containing 0.01 mg of chlorine (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution and 1 mL of silver nitrate solution, shake well, and place in a dark place for 15 min. Appendix B
Preparation of turbid standard turbidity solution
(Supplement)
B1 Reagents and solutions
Nitric acid solution: 1-3;
Dextrin solution: 20 g/l.;
Silver nitrate solution: 20 g/L;
d Hydrochloric acid standard solution: c(HCI)=0. 1 mol/L. B2 Preparation of standard turbidity solution
B2.1 Preparation of solution containing 1 mg of fluorine (Cl) per 1 ml Measure 14.1 mL of standard hydrochloric acid solution, place it in a 50 mL volumetric flask, and dilute it to the mark with water. B2.2 Preparation of standard turbidity solution
Accurately measure 0.3 mL of solution containing 1 mg of nitrogen (Cl) per 1 mL, add water to 20 mL, add 1 mL of nitric acid solution, 0.2 mL of dextrin solution and 1 mL of silver nitrate solution. Shake well and place in a dark place for 15 minutes. Additional remarks:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical jurisdiction of the Beijing Chemical Industry Research Institute of the Ministry of Chemical Industry and the Food Sanitation Supervision and Inspection Institute of the Ministry of Health. This standard was drafted by the First Branch of Xuchang Pharmaceutical Factory, Henan Province and the Nuclear Industry Physical and Chemical Engineering Research Institute. The main drafters of this standard are Xia Shujun, Zhao Qitai, Zhang Genyi and Xue Jiangfeng. This standard is equivalent to the fifth edition (1986) of the "Japanese Food Additive Code" "Diluted Benzoyl Peroxide".
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