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GB 6782-2009 English PDF

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GB 6782-2009: Food additive -- Sodium citrate
Status: Obsolete

GB 6782: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 6782-2009	English	479	Add to Cart	3 days [Need to translate]	Food additive -- Sodium citrate	Obsolete	GB 6782-2009
GB 6782-1986	English	239	Add to Cart	2 days [Need to translate]	Food additive--Sodium citrate	Obsolete	GB 6782-1986

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Basic data

Standard ID	GB 6782-2009 (GB6782-2009)
Description (Translated English)	Food additive -- Sodium citrate
Sector / Industry	National Standard
Classification of Chinese Standard	X42
Classification of International Standard	67.220.20
Word Count Estimation	12,191
Date of Issue	2009-01-19
Date of Implementation	2009-08-01
Older Standard (superseded by this standard)	GB 6782-1986
Quoted Standard	GB/T 601; GB/T 602; GB/T 603; GB/T 606; GB/T 2009.11; GB/T 5009.12; GB/T 6682
Regulation (derived from)	Announcement of Newly Approved National Standards No. 2 of 2009 (total 142)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This Chinese standard specifies the requirements of trisodium citrate dihydrate, test methods, inspection rules and signs, packaging, transportation and storage. This standard applies to starch or sugar feedstock, obtained by fermentation of purified sodium citrate dihydrate product.

GB 6782-2009: Food additive -- Sodium citrate

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Food additive.Sodium citrate ICS 67.220.20 X42 National Standards of People's Republic of China Replacing GB 6782-1986 Food additive sodium citrate Posted 2009-01-19 2009-08-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

4.2 This standard is mandatory, the remaining provisions are recommended. The reference standard physical and chemical indicators of the FAO/WHO Joint Expert Committee on Food Additives "food additive The standard compendium "Volume [CompendiumofFoodAdditiveSpecifications, Volume1, JointFAO/WHOExpert CommitteeonFoodAdditive (JECFA)], "British Pharmacopoeia" BP-2003 Edition (BritishPharmacopeia-2003) and "The United States Pharmacopoeia "USP-31 version (UnitedStatedPharmacopeia-31). This standard replaces GB 6782-1986 "food additive sodium citrate." This standard compared with GB 1987-1986 The main changes are as follows. --- Content indicators defined range; --- Increased light transmittance, moisture, water insoluble requirements; --- Cancellation barium salt requirements; --- Tightened sulfate, iron salts, oxalate, chloride requirements; --- Calcium, easy to give a specific index carbide; --- Analytical methods increase or decrease accordingly adjusted. This standard by the National Standardization Technical Committee on Food Additives proposed. This standard by the National Standardization Technical Committee on Food Additives. This standard was drafted. sunshine Luxin Jinhe Sheng Chemical Co., Ltd., Huangshi Xing Hua Biochemical Co., Ltd., China Food Fermentation Industry Research Institute, Jiangsu Yixing Union Biochemical Co., Ltd., Anhui BBCA Fermentation Engineering Research Co., Ltd. Shandong lemon Biochemical Co., Ltd. The main drafters of this standard. Zhao Hongbo, Feng Jiajun, Zhang Wei, Chen Han, Chang Chu Xia, Qing, Liu Jianxiong Chen Ying war, Guo Xinguang, Yu Li Tao. This standard replaces the standards previously issued as follows. --- GB 6782-1986. Food additive sodium citrate

1 Scope

This standard specifies the requirements of trisodium citrate dihydrate, test methods, inspection rules and signs, packaging, transportation and storage. This standard applies to starch or sugar feedstock, obtained by fermentation of purified tri-sodium citrate dihydrate product.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. Preparation of GB/T 601 chemical reagent standard titration solution GB/T 602 Determination of impurities in chemical reagents prepared standard solution (GB/T 602-2002, ISO 6353-1. 1982, NEQ) with GB/T 603 chemical reagent test method Preparations of articles (GB/T 603-2002, ISO 6353-1 with. 1982, NEQ) GB/T 606 chemical reagent Moisture common method Karl Fischer method GB /5009.11 Determination of total arsenic in food T and inorganic arsenic Determination of GB/T 5009.12 of lead in food GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD) 3 chemical name, molecular formula, molecular mass and structural formula 3.1 Chemical name. 2-hydroxy-1,2,3 propane tricarboxylic acid sodium. 3.2 Formula. C6H5Na3O7 · 2H2O. 3.3 Molecular Weight. 294.10. 3.4 Structure. Trisodium citrate dihydrate

4 Requirements

4.1 Sensory requirements White or colorless crystalline granules or powder; odorless, taste salty; in the wet air slight deliquescence, slight weathering in hot air; Soluble in water, soluble in ethanol. 4.2 Physical and Chemical Requirements Shall comply with the requirements of Table 1. Table 1 Physical and chemical requirements of trisodium citrate dihydrate Project Requirements Content (dry matter basis) /% ≥ 99.0 ~ 100.5 Transmittance /% ≥ 95.0 Moisture /% ≤ 10.0 ~ 13.0 PH test accord Sulfate /% ≤ 0.01 Ferric/(mg/kg) ≤ 5 Oxalate /% ≤ 0.01 Calcium /% ≤ 0.02 Easy carbide ≤ 1.0 Chloride /% ≤ 0.005 Lead (Pb)/(mg/kg) ≤ 2 Arsenic salt/(mg/kg) ≤ 1 Water insoluble accord with test

5 Test methods

This standard is used in the water, did not specify when the other requirements, refer to comply with GB/T 6682 the requirements. This standard reagents, when not stated specifications, refer to AR (AR). If the special requirements otherwise expressly provided. This standard solution in a solvent which does not indicate when formulated with, refers to an aqueous solution. 5.1 sensory test Weigh the sample 10g, the naked eye, sniffing, make judgments based on the provisions of 4.1. 5.2 Identification Test 5.2.1 Reagents and solutions 5.2.1.1 5% sulfuric acid. according to GB/T 603 formulation. 5.2.1.2 mercury sulfate solution. Weigh mercuric oxide 5g, add water to 40mL, and then slowly adding concentrated sulfuric acid 20mL, with stirring, plus 40mL water was stirred to dissolve. 5.2.1.3 potassium permanganate solution [Ba = (1/5KMnO4) = 0.1mol/L]. prepared according to GB/T 601. 5.2.1.4 5% hydrochloric acid. according to GB/T 603 formulation. 5.2.1.5 pyridine - acetic anhydride (3 + 1). 5.2.1.6 dihydrate trisodium citrate sample solution. the preparation of water per ml of trisodium citrate dihydrate 5mg. 5.2.2 Analysis of step 5.2.2.1 A small sample was taken in the 25mL crucible straight Huochi burning, that decompose slowly, but may not occur caramel smell. 5.2.2.2 Take sample solution 2mL, add dilute sulfuric acid (5.2.1.1) a few drops, heated to boiling, add potassium permanganate solution (5.2.1.3) a few drops, vibration Shake, purple disappear; adding mercury sulfate solution (5.2.1.2) 1 drop, a white precipitate. 5.2.2.3 Take a sample solution of about 5mL, adding pyridine - acetic anhydride (5.2.1.5) about 5mL, shaking, that generate yellow to red or purple Solution. 5.2.2.4 take platinum wire, with hydrochloric acid (5.2.1.4) after wet, dipped into the sample, in a colorless flame combustion, flame appears yellow. 5.3 Content 5.3.1 Instruments 5.3.1.1 flask. 150mL. 5.3.1.2 Acid burette. 5.3.2 Reagents and solutions 5.3.2.1 standard perchloric acid titration solution (0.1mol/L). according to GB/T 601 formulation. 5.3.2.2 crystal violet indicator solution (10g/L). according to GB/T 603 formulation. 5.3.2.3 glacial acetic acid. 5.3.2.4 acetic anhydride. 5.3.3 Analysis of step Accurately weigh (105 ℃, 2h) of dried after trisodium citrate dihydrate 0.15g, ice acetic acid 20mL, heated and dissolved, after cooling, Acetic anhydride 10mL, with 0.1mol/L perchloric acid titration. In two drops of acetic acid - crystal violet indicator solution color from blue to purple through Green endpoint. Blank test in the same manner, and make necessary amendments to the dry matter content. 5.3.4 Calculation Content of the sample according to equation (1). X1 = Ba (Vp - Vp 0) × 0.09803 (1) Where. Content X1 --- trisodium citrate dihydrate (in absolute terms),%; --- Ba molar standard solution of perchloric acid concentration, in units of moles per liter (mol/L); Vp --- sample titration consumed perchloric acid standard titration solution volume in milliliters (mL); V0 --- blank titration consumed perchloric acid standard titration solution volume in milliliters (mL); 0.09803 --- and 1.00mL perchlorate [Ba (HClO4) = 0.1mol/L] corresponding to dihydrate in grams of citric acid trisodium; 5.3.5 allowable difference The absolute difference between the same two samples of the test results shall not exceed 0.2% of the arithmetic mean. 5.4 transmittance 5.4.1 Instruments 5.4.1.1 flask. 100mL. 5.4.1.2 spectrophotometer. 5.4.2 Analysis of step Weigh 10g sample (accurate to 0.01g), dissolved in water, dilute to 100mL, shake; 1cm cuvette with water as a blank for According to the measured light transmittance of the sample solution at a wavelength of 366nm, the readings are recorded. 5.4.3 allowable difference The absolute difference between the same two samples of the test results shall not exceed 0.2% of the arithmetic mean. 5.5 Water 5.5.1 direct drying 5.5.1.1 Instruments 5.5.1.1.1 electric oven. 5.5.1.1.2 analytical balance. a sense of the amount of 0.1mg. 5.5.1.1.3 weighing bottle. 50mm × 30mm. 5.5.1.1.4 drier. with color gel desiccant. 5.5.1.2 analysis step Weigh 1g (accurate to 0.0002g) trisodium citrate dihydrate sample was already drying to constant weight weighing bottle was placed 180 ℃ ± 2 ℃ Power The hot oven drying, weighing, until constant weight. 5.5.1.3 Calculation Water samples according to equation (2). 100 (2) Where. X2 --- moisture content mass fraction,%; 5.5.1.4 allowable difference The absolute difference between the same two samples of the test results should not exceed 1% of the arithmetic mean. 5.5.2 Karl Fischer assay 5.5.2.1 Instruments Trace moisture measuring device (Karl Fischer moisture analyzer). 5.5.2.2 Reagents and solutions 5.5.2.2.1 anhydrous methanol. 5.5.2.2.2 Karl Fischer reagent. According to GB/T 606 preparation and titration. 5.5.2.3 analysis step Anhydrous methanol 20mL, stirring, until the end of the titration using Karl Fischer reagent (5.5.2.2.2), does not record the readings. Then quickly Adding an appropriate amount of sample (trisodium citrate dihydrate 0.1g), continue titration to the end. 5.5.2.4 Calculation Water samples according to equation (3) Calculated. 100 (3) Where. Moisture,% X3 --- sample; Vp 1 --- consumption volume of Karl Fischer reagent when the sample titration, in milliliters (mL); T --- Karl Fischer reagent titer of water, in grams per milliliter (g/mL); 5.5.2.5 allowable difference The absolute difference between the same two samples of the test results shall not exceed 2% of the arithmetic mean. PH 5.6 5.6.1 Reagents and solutions 5.6.1.1 phenolphthalein indicator solution. according to GB/T 603 formulation. 5.6.1.2 Sodium hydroxide solution [Ba (NaOH) = 0.1mol/L]. according to GB/T 601 formulation. 5.6.1.3 hydrochloric acid solution [Ba (HCl) = 0.1mol/L]. prepared according to GB/T 601. 5.6.2 Analysis of step Trisodium citrate dihydrate weighed sample 1.0g, dissolved in water and dilute to 10mL, add two drops of phenolphthalein indicator, such as a significant increase in red 0.1mol/L hydrochloric acid solution 0.2mL retreat should be colorless. Such as after adding phenolphthalein indicator does not color, then add 0.1mol/L sodium hydroxide solution 0.2mL should be significantly pink. 5.7 sulfate 5.7.1 Instruments 5.7.1.1 stoppered cuvette. 50mL. 5.7.1.2 beaker. 50mL. 5.7.2 Reagents and solutions 5.7.2.1 hydrochloric acid solution (6mol/L). according to GB/T 601 formulation. 5.7.2.2 barium chloride solution (250g/L). Weigh barium chloride 25g, dissolved in water, diluted with water to 100mL. 5.7.2.3 acetic acid solution (30%). according to GB/T 603 formulation. 5.7.2.4 ethanol solution (30%). amount of ethanol (96%) 313mL, diluted with water to 1000mL. 5.7.2.5 sulfate standard solution Ⅰ (0.1g/L). Weigh potassium sulfate 0.181g, diluted to 1000mL with ethanol solution (5.7.2.4). 5.7.2.6 Ⅱ sulfate standard solution (sulfate-containing 0.01g/L). lessons sulfate standard solution Ⅰ (5.7.2.5) 10.0mL, washed with ethanol Solution (5.7.2.4) diluted to 100mL. 5.7.3 Analysis of step Weigh the sample 1g (accurate to 0.01g) in 50mL colorimetric tube with a stopper, add water 15mL dissolved, this solution as the sample solution. Take two 50mL stoppered cuvette were added barium chloride solution (5.7.2.2) 1mL, hydrochloric acid solution (5.7.2.1) 2mL, then Sulphate standard solution Ⅱ1mL, shaking, standing 1min. Was added to a sample solution 15mL colorimetric tube, another branch colorimetric tube Ⅱ10mL sulfate standard solution was added water and 5mL (standard pipe), then added to each solution of hydrochloric acid (5.7.2.1) 2mL and acetic acid (5.7.2.3) 0.5mL, shake, 5min later, white-degree sample tube must not be deeper than the standard tube. 5.8 molysite 5.8.1 Instruments Stoppered cuvette. 50mL. 5.8.2 Reagents and solutions 5.8.2.1 hydrochloric acid solution (6mol/L). according to GB/T 601 formulation. 5.8.2.2 ammonium persulfate solution (10g/L). Weigh ammonium persulfate 1g, dissolved in water, diluted with water to 100mL. 5.8.2.3 ammonium thiocyanate solution (80g/L). Weigh ammonium thiocyanate 8g, dissolved in water, diluted with water to 100mL. 5.8.2.4 n-butanol. 5.8.2.5 iron standard solution Ⅰ (iron 0.1g/L). according to GB/T 602 formulation. 5.8.2.6 iron standard solution Ⅱ (iron 0.01g/L). draw iron standard solution Ⅰ10mL, diluted with water to 100mL. 5.8.3 Analysis of step Weigh the sample 2g (accurate to 0.01g), add water to dissolve 10mL, plus hydrochloric acid solution (5.8.2.1) 3mL, ammonium persulfate solution (5.8.2.2) 3mL and ammonium thiocyanate solution (5.8.2.3) 3mL, then diluted with water to 25mL, shake, adding n-butanol (5.8.2.4) 20mL, shaking stratification, and standard pipe is prepared as follows visual colorimetric, its alcohol layer color sample tube can not be deeper than the standard tube. Preparation of standard tube. absorb iron standard solution Ⅱ (5.8.2.6) 1mL, and the sample tube while the same treatment. 5.9 oxalate 5.9.1 Instruments 5.9.1.1 stoppered cuvette. 25mL. 5.9.1.2 tubes. 15mm × 180mm. 5.9.2 Reagents and solutions 5.9.2.1 hydrochloric acid (36% -38%). 5.9.2.2 phenylhydrazine hydrochloride solution (10g/L). according to GB/T 603 formulation. 5.9.2.3 iron potassium cyanide solution (50g/L). Weigh ferricyanide 5g, dissolved in water, diluted with water to 100mL. 5.9.2.4 zinc particles. 5.9.2.5 oxalic acid standard solution Ⅰ (0.25g/L). Weigh oxalic acid (C2H2O4 · 2H2O) 0.175g, dissolved in water, diluted with water to 500mL. 5.9.2.6 oxalate standard solution Ⅱ (0.01g/L). lessons oxalate standard solution Ⅰ (5.9.2.5) 4mL, diluted with water to 100mL. 5.9.3 Analysis of step Weigh the sample 0.4g (accurate to 0.01g) in a test tube, water was added 4mL, hydrochloric acid was added 3mL and zinc tablets 1g, boil 1min, put Set 2min. Moved containing 0.25mL phenylhydrazine hydrochloride solution (5.9.2.2) in a test tube, heated to boiling, rapidly cooled, poured into 25mL stoppered Color than the inner tube, was added 7mL hydrochloric acid and potassium ferricyanide solution (5.9.2.3) 0.25mL, shaking, 30min and was prepared as follows Standard visual colorimetric tube, pink sample tube must not produce deeper than standard pipe. Preparation of standard pipe. lessons oxalic acid solution Ⅱ (5.9.2.6) 4mL ships with a stopper colorimetric tube, and the sample tube while the same treatment. 5.10 calcium 5.10.1 Instruments Stoppered cuvette. 25mL. 5.10.2 Reagents and solutions 5.10.2.1 96% (volume fraction) ethanol. 5.10.2.2 acetic acid solution (2mol/L). amount of glacial acetic acid 118mL, diluted with water to 1000mL. 5.10.2.3 acetic acid (6mol/L). amount of glacial acetic acid 350mL, diluted with water to 1000mL. 5.10.2.4 ammonium oxalate solution (40g/L). Weigh ammonium oxalate 4g, dissolved in water, diluted with water to 100mL. 5.10.2.5 calcium standard solution Ⅰ (calcium 1g/L). Weigh to the drying of 105 ℃ ~ 110 ℃ calcium carbonate 2.5g, was added 6mol/L acetic acid 12mL dissolved, diluted with water to 1000mL. 5.10.2.6 calcium standard solution Ⅱ (calcium 0.01g/L). absorb calcium standard solution Ⅰ1mL, diluted with water to 100mL. 5.10.2.7 Sample solution. Weigh trisodium citrate dihydrate 0.50g, add water to dissolve 15mL. 5.10.3 analysis step In 25mL colorimetric tube, add the sample solution 15mL, ammonium oxalate solution (5.10.2.4) 1mL, acetic acid solution was added after 1min (5.10.2.2) 1mL and 96% ethanol 1mL, shake, place 15min after the standard was prepared as follows Visible turbidimetric tube, its milky degree Shall not exceed the standard pipe. Preparation of standard tube. absorb calcium standard solution Ⅱ (5.10.2.6) 10mL and water 5mL, adding ammonium oxalate solution (5.10.2.4) 1mL, Acetic acid solution (5.10.2.2) 1mL and 96% ethanol 1mL, shake. 5.11 Yi carbide 5.11.1 Instruments 5.11.1.1 stoppered cuvette. 25mL. 5.11.1.2 water bath. temperature control accuracy of ± 1 ℃. 5.11.2 Reagents and solutions 5.11.2.1 1% (volume fraction) solution of hydrochloric acid. lessons hydrochloric acid 24mL, diluted to 1000mL. 5.11.2.2 potassium iodide. 5.11.2.3 sulfuric acid solution [Ba (1/2H2SO4) = 1mol/L]. according to GB/T 601 formulation. 5.11.2.4 sodium thiosulfate standard titration solution [Ba (Na2S2O3) = 0.1mol/L]. according to GB/T 601 formulation and calibration. 5.11.2.5 3% (volume fraction) hydrogen peroxide solution. lessons of 30% hydrogen peroxide 10mL, diluted with water to 100mL. 5.11.2.6 sodium hydroxide solution (300g/L). Weigh sodium hydroxide 30g, dissolved in water, diluted with water to 100mL. 5.11.2.7 starch indicator solution (10g/L). according to GB/T 603 formulation. 5.11.2.8 ferric chloride. 5.11.2.9 cobalt chloride. 5.11.2.10 yellow liquid. weigh ferric chloride (5.11.2.8) 46g, was dissolved in approximately 900mL of hydrochloric acid solution (5.11.2.1), and then this Hydrochloric acid solution was diluted to 1000mL. When calibration with hydrochloric acid solution (5.11.2.1) to adjust the yellow liquid to 46mg per ml FeCl3 · 6H2O. The solution must be protected from light, now with the current calibration. Calibration. lessons 10mL freshly prepared ferric chloride solution, water was added 15mL, potassium iodide (5.11.2.2) 4g, hydrochloric acid (5.11.2.1) 5mL, immediately stuffed with dark cap standing 15min, water was added 100mL, iodine with sodium thiosulfate standard titration solution precipitated Solution (5.11.2.4) titrated to a pale yellow, add starch indicator solution (5.11.2.7) 0.5mL, continue titration to a pink endpoint. NOTE. 0.1mol/L sodium thiosulfate standard titration solution equivalent 27.03mgFeCl3 · 6H2O per ml. 5.11.2.11 red liquid. weigh cobalt chloride (5.11.2.9) 60g, was dissolved in approximately 900mL of hydrochloric acid solution (5.11.2.1), and then this salt Acid solution was diluted to 1000mL. (5.11.2.1) to adjust the calibration of this red liquid with hydrochloric acid solution to 59.5mg per ml CoCl2 · 6H2O. The solution must be protected from light, now with the current calibration. Calibration. lessons cobalt chloride solution 5.0mL freshly prepared by adding hydrogen peroxide solution (5.11.2.5) 5mL and sodium hydroxide solution (5.11.2.6) 10mL, slowly boil 10min, cooled. Plus potassium iodide (5.11.2.2) 2g, sulfuric acid solution (5.11.2.3) 60mL, Li That stuffed caps and gently shake to dissolve the precipitate. Precipitated iodine with sodium thiosulfate standard titration solution (5.11.2.4) titrated to a pale yellow, When the end add starch indicator solution (5.11.2.7) 0.5mL, continue titration until the solution was pink. NOTE. 0.1mol/L sodium thiosulfate standard titration solution equivalent 23.79mgCoCl2 · 6H2O per ml. 5.11.2.12 limit color standard solution. yellow and red liquid stock solution by mixing 1 + 9. 5.11.3 analysis step Weigh 1.0g sample in a 25mL tube with a stopper colorimetric, concentrated sulfuric acid 10mL, heated at 90 ℃ ± 1 ℃ water bath Must be cooled with ice time 60min, at 5min, 30min are removed quickly shaken uniformly heating was continued to 1h, removed, rapid cooling (hot days but). Slowly into 1cm cuvette, with water as the blank, measured at a wavelength of 470nm absorbance A1; was measured as color limit Standard solutions (5.11.2.12) absorbance A2. 5.11.4 Calculation Absorbance ratio easily carbonized by formula (4) Calculated. K = A1/A2 (4) Where. K --- Easy carbonized absorbance ratio; A1 --- absorbance of the sample solution value; Absorbance A2 --- standard solution. Determined. K less than or equal to 1.0 qualified. 5.11.5 allowable difference The absolute difference between two samples of the same measurement result shall not exceed 5% of the arithmetic mean. 5.12 Chloride 5.12.1 Instruments Stoppered cuvette. 25mL. 5.12.2 Reagents and solutions 5.12.2.1 13% (volume fraction) nitric acid solution. Press GB/T 603 formulation. 5.12.2.2 silver nitrate solution [Ba (AgNO3) = 0.1mol/L]. according to GB/T 603 formulation. 5.12.2.3 chloride standard solution Ⅰ (chlorine-containing 0.1g/L). according to GB/T 602 formulation. 5.12.2.4 chloride standard solution Ⅱ (chlorine-containing 0.005g/L). draw chloride standard solution Ⅰ5mL, diluted with water to 100mL. 5.12.3 analysis step Weigh the sample 1g (accurate to 0.0001g), add water to dissolve 15mL, plus nitric acid solution (5.12.2.1) 1mL, join now Silver nitrate solution (5.12.2.2) 1mL, dark standing 2min, on a black background horizontal visual turbidity simultaneously with the standard tube cream Shall not exceed the following standard pipe prepared. Preparation of standard pipe. lessons chloride standard solution Ⅱ (5.12.2.4) 10mL, add water, 5mL, and the sample tube at the same time for the same deal with. 5.13 Lead Weigh sample 1g (accurate to 0.01g), dissolved in water and dilute to 50mL, shake, without digesting, as a sample solution. Following According to GB/T 5009.12 Determination. 5.14 Arsenic salt According to GB/T 5009.11 Determination. 5.15 Water insoluble matter 5.15.1 Instruments 5.15.1.1 conical flask. 1000mL. 5.15.1.2 vacuum filtration apparatus. 50mm filtration device. 5.15.1.3 membrane. pore size 0.2μm. 5.15.1.4 membrane. pore size 0.8μm. 5.15.2 Reagents and solutions Water. water through 0.2μm membrane filter. 5.15.3 analysis step Weigh the sample 50g, stirred and dissolved in 400mL of wat...

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