Some standard content:
Chemical Industry Standard of the People's Republic of China
Feed grade sodium propionate
Feed grade sodiun propionateUDC636.085.57
:661.833.7
HG2930-1987(1997)
Replace GB8247-87
This standard applies to sodium propionate prepared by the reaction of propionic acid and sodium carbonate. This product is added to feed as a mildew preventer. Molecular formula: CH,CH,COONa
Molecular weight: 96.06 (according to the international atomic weight in 1983) 1 Technical requirements
1.1 Appearance: This product is white crystalline particles or powder. It is easily soluble in water and slightly soluble in ethanol. It is odorless or has a slight odor of isopropionic acid. 1.2 Sodium propionate should meet the requirements of Table 1.
Indicator name
Content (in CHCH, COONa thousand bases)
Dissolved in water
Free acid (in CH, COOH)
Free thief (in Na, CO,)
Loss on drying
Heavy metal (in Pb)
2Test methodWww.bzxZ.net
Slightly turbid
The reagents and water used in the test, unless otherwise specified, are analytically pure reagents and distilled water or water of corresponding purity. The test instruments are ordinary laboratory instruments.
When no other requirements are specified, the standard solution used shall be prepared in accordance with GB601-77 "Method for the Preparation of Chemical Reagent Standard Solutions"; the impurity standard solution shall be prepared in accordance with GB602-77 (Method for the Preparation of Chemical Reagent Impurity Standard Solutions"; the preparations and products shall be prepared in accordance with GB603-77 "Method for the Preparation of Chemical Reagent Preparations and Products".
2.1 Identification
2.1.1 Reagents and Solutions
2.1.1.1 Sulfuric Acid (GB 625-77):1+9 solution;2.1.1.2 Uranyl acetate (HGB3512-62);2.1.1.3 Glacial acetic acid (GB676-78);
2.1.1.4 Zinc acetate (HGB3100-59);
2.1.1.5 Uranyl acetate zinc solution: Weigh 10g uranyl acetate (2.1.1.2) and place it in a conical flask, add 5ml glacial acetic acid (2.1.1.3) and 50ml water, and heat slightly to dissolve. Take another 30g zinc acetate (2.1.1.4), add 3ml glacial acetic acid (2.1.1.3) and 30ml water, heat slightly to dissolve, mix the two liquids, cool, filter and use. 2.1.2 Identification method
Approved by the National Bureau of Standards on October 14, 1987
Implemented on May 1, 1988
HG2930-1987 (1997)
2.1.2.1 Propionic acid: Take 0.5g of the sample and dissolve it in 5ml of water, add 5ml of sulfuric acid (2.1.1.1) solution, and it will have a special smell of propionic acid when heated. 2.1.2.2 Sodium: Take 0.5g of the sample and dissolve it in 5ml of water, add 5ml of sulfuric acid (2.1.1.1) solution, and it will have a special smell of propionic acid when heated. Dissolve in 10ml water, take a few drops of this solution, add a few drops of zinc acetate (2.1.1.5) solution, and a yellow precipitate will be produced.
2.2 Determination of sodium propionate content
2.2.1 Reagents and solutions
2.2.1.1 Glacial acetic acid (GB676-78);
2.2.1.2 Perchloric acid (GB623-77); C (HCIO) is about 0.1mol/l standard solution; 2.2.1.3 Crystal violet indicator solution: 0.2% (m/V) glacial acetic acid solution. 2.2.2 Determination Determination method
The sample is dried at 105℃ for 1h in advance, 0.3g of the sample is weighed, accurate to 0.0002g, and 40ml of glacial acetic acid (2.2.1.1) is added to a conical flask. If necessary, heat to dissolve, cool to room temperature, add 2 drops of crystal violet indicator solution (2.2.1.3), and titrate with perchloric acid standard solution (2.2.1.2) until it turns blue-green. The titration result is corrected by a blank test. 2.2.3 Calculation of results
The percentage of sodium propionate (CHCH, COONa) is calculated according to formula (1): C.(V-Yo) ×0.09606 × 100 = 9.606 ×C (V- v)m
Wherein: C is the molar concentration of perchloric acid standard solution, mol/l; V
is the volume of perchloric acid standard solution consumed in the blank test, ml; n
is the mass of the sample, g:
0.09606 is the number of grams per millimole of sodium propionate. The difference between the results of the two parallel samples shall not exceed 0.2%, and the arithmetic mean shall be reported as the result. 2.3 Determination of dissolved state in water
2.3.1 Reagents and solutions
2.3.1.1 Hydrochloric acid (GB622-77): C (HCI) is 0.1mol/1 standard solution: 2.3.1.2 Nitric acid (GB626-78): 1+3 solution; 2.3.1.3 Dextrin: 2% (W/V) solution:
2.3.1.4 Silver nitrate (GB670-77): 2% (W/V) solution; (1)
2.3.1.5 Turbidity standard stock solution: 1ml contains Cl21mg. Pipette 14.1ml 0.1mol/l hydrochloric acid standard solution (2.3.1.1) into a 50ml volumetric flask and dilute to the mark;
2.3.1.6 Turbidity standard solution: 1ml contains Cl20.01mg. Pipette 10ml of the standard stock solution (2.3.1.5) into a 1000ml volumetric flask and dilute to the mark.
2.3.2 Determination method
Weigh 1g of the sample, accurate to 0.01g, and dissolve it in 20ml of water. The solution should be colorless and the turbidity should not be deeper than that of the standard solution. Pipette 1.2ml of the turbidity standard solution (2.3.1.6), add water to 20ml, add 1ml of nitric acid solution (2.3.1.2), 0.2ml of dextrin solution (2.3.1.3) and 1ml of silver nitrate solution (2.3.1.4), and let stand for 15min. It will be a slightly turbid standard solution. 2.4 Determination of free acid and free base
2.4.1 Reagents and solutions
2.4.1.1 Hydrochloric acid (GB622-77): C(HCI) is a standard solution of about 0.1 mol/l: 2.4.1.2 Sodium hydroxide (GB629-81): C(NaOH) is a standard solution of about 0.1 mol/l; 2.4.1.3 Phenolic acid (HGB3039~59) indicator: 1% (W/V) ethanol solution; water without carbon dioxide.
2.4.2 Determination method
HG2930-1987(1997)
Weigh 2g of sample, accurate to 0.01g, place in a 100ml conical flask, add 20ml of water without carbon dioxide (2.4.1.4), dissolve, add 2 drops of phenolic acid indicator solution (2.4.1.3), if the test solution is colorless, it should turn pink when 0.3ml of sodium hydroxide standard solution (2.4.1.2) is added; if the test solution is pink, the pink color should disappear when 0.3ml of hydrochloric acid standard solution (2.4.1.1) is added. 2.5 Determination of loss on drying
2.5.1 Determination method
Weigh 1g of sample, accurate to 0.0002g, and place in a weighing bottle of 45mm×h25mm that has been weighed to a constant weight at 105℃ for 1h, take it out, put it in a desiccator, cool it to room temperature, and weigh it until it weighs a constant weight. 2.5.2 Calculation of results
The percentage of loss on drying is calculated according to formula (2): m-mi
Where: m-
-the mass of the sample before drying, g;
-the mass of the sample after drying, g.
The difference between the two determination results shall not be greater than 0.2%, and the arithmetic mean shall be reported as the result. 2.6 Determination of heavy metals
2.6.1 Reagents and solutions
2.6.1.1 Glacial acetic acid (GB676-78): 6% (V/V) solution; 2.6.1.2 Sodium sulfide (HG3-905-76): weigh 1g sodium sulfide, dissolve it in water to 10ml, prepare it freshly before use; 2.6.1.3 Lead standard solution: 1ml contains 0.01mgPb. Prepare it according to the provisions of GB602-77, and then dilute it 10 times. 2.6.2 Determination method
Weigh 1g of sample, accurate to 0.01g, put it in a 50ml Nessler colorimetric tube, add 2ml glacial acetic acid solution (2.6.1.1), 30ml water and 2 drops of sodium sulfide solution (2.6.1.2), dilute it with water to the scale, shake it well, and let it stand for 5min. Its color should not be darker than the standard. The standard is to take 2.0 ml of lead standard solution (2.6.1.3) and treat it in the same way as the sample. 2.7 Determination of arsenic
2.7.1 Reagents and solutions
2.7.1.1 Hydrochloric acid (GB622-77): 1+1 solution 2.7.1.2 Potassium iodide (GB1272~77): 16.5% (m/V) solution; 2.7.1.3 Stannous chloride (GB638-78): 40% (m/V) hydrochloric acid solution; valid for one month; 2.7.1.4 Arsenic-free metallic zinc (GB2304-80); 2.7.1.5 Lead acetate absorbent cotton;
2.7.1.6 Mercuric bromide test paper;
2.7.1.7 Arsenic standard solution: 1ml contains 0.001mgAs. Prepare according to the provisions of GB602-77 and dilute 100 times. 2.7.2 Determination method
Weigh 1g of sample, accurate to 0.01g, place in a wide-mouth bottle, and determine according to the "1 monument spot method" in GB610-77 "Determination of Arsenic". The arsenic spot shall not be deeper than the standard.
The standard is to take 2.0ml of arsenic standard solution and treat it in the same way as the sample. 3 Acceptance rules
3.1 This product shall be inspected by the technical inspection department of the manufacturer. The manufacturer shall ensure that all products shipped meet the requirements of this standard. Each batch of products shipped shall be accompanied by a quality certificate and instruction manual. 3.2 The user unit may conduct acceptance in accordance with the provisions of this standard. If the supply and demand parties have objections to the product quality, the state authorized 3.
Quality inspection agencies shall conduct arbitration inspections on products of this type.
HG2930-1987(1997)
3.3 The weight of each batch of this product shall not exceed the production output of the production plant per shift. 3.4 Sampling method
3.4.1 Select the number of sampling bags from each batch of products as specified in Table 2. Table 2
Total number of bags per batch
17~400
3.4.2 Use a sampler to take samples through 3/4 of the material layer. Each bag shall be sampled for no less than 50g. Number of bags selected
Total number of bags
VTotal number
3.4.3 Mix the samples quickly and reduce them to 20 by quartering. 0g. Divide into two clean, dry bottles with ground stoppers. Label the bottles. Note: manufacturer name, product name, batch number and sampling date. One bottle is used for inspection, and one bottle is kept for 6 months for arbitration analysis.
3.5 If one indicator does not meet the standard during the inspection, samples should be selected from twice the amount of packaging for re-verification. Even if one indicator does not meet the standard during the verification, the entire batch cannot be accepted. 4 Packaging, marking, storage and transportation
4.1 Feed-grade sodium propionate is packaged in plastic woven bags lined with food-grade plastic bags. The net weight of each bag is 1kg or 5kg. 4.2 The package should have a firm mark indicating the product name, manufacturer, Name, factory address, batch number, approval number, storage conditions, usage, net weight, and marked with "feed grade". 4.3·The ex-factory products should be accompanied by a quality certificate, which includes the product name, manufacturer name, factory address, batch number, approval number, product quality, this standard number and laboratory technician code.
4.4 This product should be stored in a ventilated, cool and dry place. 4.5 It must not be mixed or transported with toxic and hazardous substances during transportation. Additional notes:
This standard was proposed by the Ministry of Agriculture, Animal Husbandry and Fisheries of the People's Republic of China and the Ministry of Chemical Industry of the People's Republic of China. This standard was drafted by the China Veterinary Drug Supervision Institute and the Beijing Institute of Chemical Industry. The main drafters of this standard are Zhong Feng and Hu Yanfeng.
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