Some standard content:
National Standard of the People's Republic of China
Photographic grade hydroquinone
Photagraphic grade hydroquinoneThis standard is equivalent to the international standard LS0423-1976 "Photographic grade hydroquinone specification". This product is a white or nearly white powder. Formula: HO
Structural formula:
Molecular weight: 110.11 (according to the 1985 International Atomic Energy Agency) 1 Subject content and scope of application
GB 10552-89
Regulatory efficiency: HG/ 302X-
This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of photographic grade hydroquinone. This standard applies to hydroquinone used in the processing of concave noise light sensitive materials. 2
Cited standards
GR 6i7
GB 619
Chemical reagents-Preparation of standard solutions for titration analysis (volume analysis) Chemical reagents
Preparation of standard solutions for impurity determination
Chemical reagents
Chemical reagents
GB6682
3. Technical requirements
Method for determination of melting point
Sampling and acceptance rules
Specifications for laboratory water
Content of hydroquinone (110CH,0H) 99.0%～101%3.1
3.2 Melting point: 171~175 °C
3.3 Maximum content of impurities (in terms of percentage): %
Solubility
Ignition residue
Heavy metals (in terms of Pb)
Approved by the Ministry of Chemical Industry of the People's Republic of China on February 25, 1989
Implementation on December 0, 1989
4 Test methods
4.1 Determination of hydroquinone (HOC,H,OH) content］GB 10552 89
Weigh 0.1g of sample, accurate to 0.0001g, add 100mL of distilled water and 15mL of sulfuric acid bath solution (2mol/L) into a 500mL volumetric flask, cool to below 15, add 1~2 drops of aniline indicator solution (10g/L), and titrate with sulfuric acid (or ammonium sulfate) standard solution [e(SesO,)=0.05mal/L1. When the bath solution changes from blue to purple, the content of hydroquinone is calculated as follows:
. c X 0. 055 06
Wherein: "Percentage of hydroquinone, %; potassium sulfate standard solution, mL;
Concentration of cerium sulfate standard solution, mol/L; m——sample mass;
0.05506——Number of grams equivalent to each millimole of hydroquinone (1/2p-HOC,H,OH); 4.2 Determination of melting point
Determine in accordance with the provisions of GB617.
4.3 Determination of impurity content
4. 3. 1 Solubility
Weigh 2.5g of the sample, accurate to 0.01g. Place it in a 50mL colorimetric tube, add 50mL of acetic acid solution (1+19), and mix well. The test solution should be colorless and transparent, without any sediment. 4.3.2 Residue from ignition
Weigh 5g of the sample, accurate to 0.1g, place it in a constant weight pile, and heat it to carbonize. After cooling, add 1mE of sulfuric acid and heat until the sulfuric acid vapor escapes. Then ignite it in a muffle furnace at 600±50℃ for 4h. Cool it to room temperature in a desiccator and weigh it, accurate to 1mg. The weight of the residue should not be greater than 2.5mg. Keep the residue for measuring heavy metals and iron, 4.3.3 Heavy metals (Pb Calculation)
Take the ignition residue in 1.3.2 into a 60mL beaker, add 15mL hydrochloric acid solution (1+9), and heat on a water bath until the residue dissolves. Cool, add 2 drops of p-nitrophenol indicator solution (2.58/), add ammonia solution (1+9) until the test solution just turns yellow, then add acetic acid solution (1+16) until the test solution turns colorless. Pass 1ml. Transfer to a 50mL volumetric flask, dilute to the scale with water, and mix well. Transfer 20mL of the above test solution (the remaining test solution is used for iron measurement). Place in a 50mL Yu colorimetric tube. Add 5mL of saturated hydrogen sulfide solution, dilute to the scale, and mix well. The color of the test solution shall not be darker than that of the standard.
The standard is to take 0.02 mg of lead (Pb) impurity standard solution and treat it in the same way as the sample. 4.3.4 Iron (Fe)
Pipette 20 mL of the test solution (the remaining test solution in 4.3.2) into a 50 mL Nessler colorimetric tube, add 2 mL of hydroxylamine hydrochloride solution (100 g/L), mix, and let stand for 10 min. Add 2 mL of acetic acid-sodium acetate buffer (pH = 5.0), add 2 nl of o-phenanthroline solution (1 g/L), dilute to 5! mL with water, and mix. The color of the test solution must not be darker than the standard. The standard is to take 0.02 mg of iron (Fe) impurity standard solution, and treat it in the same way as the sample at the same time, and use the instructions.
1) Although JS0423-1976 uses ammonium sulphate-acetic acid standard solution, the toxicity of arsenic trioxide and arsenic trioxide standard substances in the standard solution is high, so this method uses sulfuric acid standard solution instead. 14
5 Acceptance rules
GB10552-89
5.1 This product should be inspected by the quality inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer should ensure that all products shipped meet the requirements of this standard.
5.2 The user has the right to inspect the received products in accordance with the provisions of this standard. 5.3 Sampling according to the provisions of G 619
5.4 If one of the indicators in the inspection results does not meet the requirements of this standard, the sample should be re-tested in the packaging twice as much as expected. If only one item of the re-inspection result does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.5 When the supply and demand parties have objections to the product quality, they shall be resolved through negotiation. If arbitration is required, it shall be handled in accordance with the provisions of the National Product Quality Arbitration Inspection Interim Measures. Www.bzxZ.net
6 Packaging, marking, transportation and purchase and storage 21
6.1 Packaging
The packaging unit is 25kg. The first layer of the inner packaging is a transparent plastic curtain seal, the second layer is an 80g paper bag seal, and the third layer is a carbon black plastic bag. The outer packaging is a woven bag. The third layer of the inner packaging bag and the outer packaging bag are reversed and locked together. If special packaging is required, it shall be agreed upon by the supply and demand parties separately. 6.2 Marking
The packaging container shall be accompanied by a product certificate. The outer packaging shall be marked with the product name, standard number, registered trademark, net weight, gross weight, production batch number, date, manufacturer name and address. 6.3 Transportation
During transportation, the product should be loaded and unloaded with care, and should be protected from heat, moisture, sunlight and hooks. 6.4 Storage
The product should be stored in a cool place away from sunlight. Additional remarks:
This standard was proposed by the National Photosensitive Material Standardization Technical Committee and is under the jurisdiction of the Photosensitive Material Technology Development Center of the Ministry of Chemical Industry. The Dalian Red Star Chemical Plant is responsible for drafting this standard. The main drafters of this standard are Ding Li, Miao Guangyun, Wang Shulian, Sun Maoqin and Jiang Lihua. From the date of implementation of this standard, the original Ministry of Chemical Industry standard HG7-136080 "Photographic Grade Para-phenol" will be invalid. Adoption instructions:
1] Compared with 150 423-1976, inspection rules are added. 2] Compared with 150 423-196, packaging, labeling, transportation and recommendations are added. 13
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