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GB 8538-2022 English PDF

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GB 8538-2022: National food safety standard - Methods for examination of natural mineral drinking water
Status: Valid

GB 8538: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB 8538-2022English3189 Add to Cart 16 days [Need to translate] National food safety standard - Methods for examination of natural mineral drinking water Valid GB 8538-2022
GB 8538-2016EnglishRFQ ASK 16 days [Need to translate] Food safety national standard - Methods for examination of drinking natural mineral water Obsolete GB 8538-2016
GB/T 8538-2008EnglishRFQ ASK 3 days [Need to translate] Methods for examination of drinking natural mineral water Obsolete GB/T 8538-2008
GB/T 8538-1995EnglishRFQ ASK 3 days [Need to translate] Methods for examination of drinking natural mineral water Obsolete GB/T 8538-1995
GB/T 8538.1-1987EnglishRFQ ASK 3 days [Need to translate] General principles for analysis method of drinking natural mineral water Obsolete GB/T 8538.1-1987

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Basic data

Standard ID GB 8538-2022 (GB8538-2022)
Description (Translated English) National food safety standard - Methods for examination of natural mineral drinking water
Sector / Industry National Standard
Classification of Chinese Standard C53
Word Count Estimation 194,125
Issuing agency(ies) National Health Commission of the People's Republic of China, State Administration for Market Regulation

GB 8538-2022: National food safety standard - Methods for examination of natural mineral drinking water


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National food safety standard - Methods for examination of natural mineral drinking water Book the National Standard of the People's Republic of China national food safety standards Test method for drinking natural mineral water Published on 2022-06-30 Implementation on 2022-12-30 National Health Commission of the People's Republic of China Released by the State Administration for Market Regulation directory Preface III 1 Scope 1 2 Chroma 1 3 Taste and smell 2 4 State 2 5 Turbidity 2 6 pH 3 7 Total dissolved solids 4 8 total hardness 5 9 Total alkalinity 7 10 Total acidity9 11 Multi-element determination 10 12 Potassium and sodium 15 13 Calcium 19 14 Magnesium 21 15 iron 24 16 Manganese 25 17 Copper 28 18 Zinc 36 19 Total chromium 37 20 Lead 39 21 Cadmium 41 22 Total mercury 43 23 silver 47 24 Strontium 50 25 Lithium 53 26 Barium 56 27 Vanadium 57 28 Antimony 61 29 Cobalt 64 30 Nickel 68 31 Aluminum 72 32 Selenium 76 33 Arsenic 81 34 Borate 87 35 Metasilicic acid 90 36 Fluoride 93 37 Chloride 100 38 Iodide 102 39 Carbon dioxide 109 40 Nitrate 110 41 Nitrite 113 42 Carbonates and bicarbonates 114 43 Sulfate 115 44 Oxygen consumption 120 45 Cyanide 122 46 Volatile phenolic compounds 127 47 Anionic synthetic detergents 131 48 Mineral oil 133 49 Bromate 140 50 Sulfide 145 51 Phosphate 148 52 Total beta radioactivity 150 53 Tritium 153 54 226Ra Radioactivity 157 55 Coliform 160 56 Streptococcus faecalis 168 57 Pseudomonas aeruginosa 170 58 Clostridium perfringens 174 Appendix A Media and Reagents 177 Appendix B Collection and preservation of drinking natural mineral water 187

foreword

This standard replaces GB 8538-2016 "National Food Safety Standard Drinking Natural Mineral Water Inspection Method". Compared with GB 8538-2016, the main changes are as follows. --- Pseudomonas aeruginosa added the content of confirmation test; --- Added the methods and requirements for sampling and preservation of water samples for microbial testing in Appendix B; ---Coliform modified the multi-tube fermentation test method and its scope of application; --- Clostridium perfringens modified confirmatory test and enumeration method and enumeration medium. national food safety standards Test method for drinking natural mineral water

1 Scope

This standard specifies the color, taste and odor, state, turbidity, pH, total dissolved solids, total hardness, total alkalinity of drinking natural mineral water degree, total acidity, multi-element determination, potassium and sodium, calcium, magnesium, iron, manganese, copper, zinc, total chromium, lead, cadmium, total mercury, silver, strontium, lithium, barium, vanadium, antimony, cobalt, nickel, Aluminum, Selenium, Arsenic, Borate, Metasilicic Acid, Fluoride, Chloride, Iodide, Carbon Dioxide, Nitrate, Nitrite, Carbonate and Bicarbonate, Sulfur Acid salts, oxygen consumption, cyanide, volatile phenolic compounds, anionic synthetic detergents, mineral oil, bromate, sulfide, phosphate, total beta radioactivity, tritium, 226Ra radioactivity, coliforms, Streptococcus faecalis, Pseudomonas aeruginosa, Clostridium perfringens determination method. This standard applies to the determination of drinking natural mineral water indicators.

2 Chroma

2.1 Principle It is formulated with potassium chloroplatinate and cobalt chloride to make a standard color with the same hue as natural water yellow for visual colorimetric determination of water samples. Regulation The color of 1mg/LPt [existing in the form of (PtCl6)2-] is used as a chromaticity unit, which is called 1 degree. Even slight turbidity can interfere with the measurement, so turbid water samples need to be centrifuged to make them clear. 2.2 Reagents and materials Unless otherwise specified, the reagents used in this method are of analytical grade, and the water is grade 3 water specified in GB/T 6682. 2.2.1 Potassium chloroplatinate (K2PtCl6). 2.2.2 Cobalt chloride (CoCl2·6H2O). 2.2.3 Platinum-cobalt standard solution. accurately weigh 1.246g potassium chloroplatinate (K2PtCl6) and 1.000g dry cobalt chloride (CoCl2·6H2O), dissolve in 100mL water, add 100mL hydrochloric acid (ρ20= 1.19g/mL), dilute to 1000mL with water. The color of this standard solution is 500 degrees. 2.3 Instruments and equipment 2.3.1 Colorless colorimetric tube with stopper. 50mL. 2.3.2 Centrifuge. 2.3.3 Analytical balance. the sensed amount is 0.1 mg. 2.4 Analysis steps 2.4.1 Sample processing Pipette 50mL of transparent water sample into a colorimetric tube. If the color of the water sample is too high, take less water sample, add water to dilute the color, and multiply the result by dilution factor. 2.4.2 Determination Take another 11 colorimetric tubes, add platinum-cobalt standard solution (2.2.3) 0mL, 0.50mL, 1.00mL, 1.50mL, 2.00mL, 2.50mL, 3.00mL, 3.50mL, 4.00mL, 4.50mL and 5.00mL, add water to the mark, shake well, that is, the chromaticity is 0 degrees, Standard series of 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees and 50 degrees. Compare the water sample with the platinum-cobalt standard color series, if the color tone of the water sample is inconsistent with the standard series, it is a different color, which can be described in words. 2.5 Presentation of analysis results The chromaticity in the sample is calculated according to formula (1). Chroma = V1×500V(1) In the formula. chromaticity---unit is degree; V1 --- equivalent to the amount of platinum-cobalt standard solution, in milliliters (mL); V—volume of water sample, in milliliters (mL).

3 Taste and smell

3.1 Taste analysis steps Take a small amount of water sample and put it in your mouth (this water sample should be harmless to human body), do not swallow it, taste the taste of the water, describe and record it with appropriate words. 3.2 Odor analysis steps Measure 100mL water sample, put it in a 250mL conical flask, after shaking, smell the smell of water from the bottle mouth, describe and record with appropriate words.

4 Status

Shake the water sample well, observe directly with the naked eye, and record.

5 Turbidity

5.1 Principle The intensity of the scattered light from the standard suspension of formazin was compared with the intensity of the scattered light from the water sample under the same conditions. The intensity of scattered light The larger the value, the higher the turbidity. 5.2 Reagents and materials Unless otherwise specified, the reagents used in this method are of analytical grade, and the water is grade 3 water specified in GB/T 6682. 5.2.1 Hydrazine sulfate solution (10g/L). Accurately weigh 1.000g of hydrazine sulfate [(NH2)2·H2SO4], dissolve in water, and dilute to a 100mL volumetric flask. Warning---The solution is carcinogenic, avoid inhalation, ingestion and skin contact! 5.2.2 Hexamethylenetetramine solution (100g/L). accurately weigh 10.00g of hexamethylenetetramine [(CH2)6N4], dissolve in water, and dilute to in a 100mL volumetric flask. 5.2.3 Formazin standard suspension. respectively pipette 5.00mL hydrazine sulfate solution and 5.00mL hexamethylenetetramine solution into a 100mL volumetric flask, mix well, and place at 25℃±3℃ for 24h Then, add water to the mark and mix well. The turbidity of this standard suspension is 400 NTU. Book Standard solution can be used for one month. 5.2.4 Formazin standard working solution. Dilute the formazin standard suspension 10 times with water. The turbidity after dilution is 40NTU, and it should be diluted appropriately when needed. 5.3 Instruments and equipment Scattering Turbidimeter. 5.4 Analysis steps Operate according to the instruction manual of the instrument. When the turbidity exceeds 40NTU, it can be diluted with water and measured. 5.5 Presentation of analysis results The result is calculated by multiplying the turbidity reading displayed by the instrument by the dilution factor. Note 1.When the room temperature rises, the saturated potassium chloride solution in the calomel electrode may change from a saturated state to an unsaturated state, so a certain amount of chloride should be maintained in the electrode. Potassium crystals. Note 2.For solutions with pH > 9, a high alkali glass electrode should be used to measure the pH.

7 Total dissolved solids

7.1 105°C drying-gravimetric method 7.1.1 Principle Total Dissolved Solids is the total amount of dissolved inorganic mineral components in water. The water sample was filtered through a 0.45 μm filter membrane to remove the suspended solids, and a certain volume of the filtrate was evaporated to dryness and dried at 105 °C to constant weight. Half (bicarbonate decomposes when drying loses carbon dioxide and converts to carbonate) is the total dissolved solids. 7.1.2 Instruments and equipment 7.1.2.1 Porcelain evaporating dish. 7.1.2.2 Oven. temperature control accuracy ±1°C. 7.1.2.3 Water bath. 7.1.2.4 Dryer. 7.1.2.5 Analytical balance. 0.1 mg of sense. 7.1.3 Analysis steps Put the cleaned porcelain evaporating dish into an oven to dry at 105 ℃ for 1 h, then take it out and cool it to room temperature in a desiccator, and weigh it. Repeat dry Dry, cool and weigh until constant weight (the difference between two consecutive weighings is less than 0.0005g). Draw an appropriate amount (so that the measured soluble solids are 2.5mg to.200mg) of clear water samples (water samples containing suspended solids should be filtered through a 0.45μm filter) into a constant weight porcelain evaporating dish, and evaporate to dryness in a boiling water bath. Put the porcelain evaporating dish into the oven, dry at 105 ℃ for 1 h, then take it out and cool it to room temperature in the desiccator, and weigh. Repeated drying, cooling But, weigh until constant weight. 7.1.4 Presentation of analysis results The content of total dissolved solids in the sample is calculated according to formula (2). 7.1.5 Precision Under the conditions of repeatability, the absolute difference between the two independent determination results obtained shall not exceed 10% of the arithmetic mean. 7.2 180°C drying-gravimetric method 7.2.1 Principle When the water sample has permanent hardness, the calcium and magnesium ions that make up the permanent hardness will form sulfate and chloride when evaporated to dryness. Dry at 105°C. During the determination by the method, the crystal water contained in the sulfate of calcium and magnesium cannot be completely removed, which will make the result high; the chloride of calcium and magnesium has a strong The hygroscopicity will also affect the measurement accuracy. Add an appropriate amount of sodium carbonate to the water sample in advance, so that calcium and magnesium ions form carbon after evaporation to dryness acid, and drying at 180 °C will eliminate the above effects. 7.2.2 Reagents and materials Sodium carbonate (Na2CO3). 7.2.3 Instruments and equipment Same as 7.1.2. 7.2.4 Analysis steps Weigh 0.2g ~ 0.4g of sodium carbonate (Na2CO3) in a cleaned porcelain evaporating dish, put it in an oven to dry at 180 ℃ for 2h. Take out and let dry Cool to room temperature in a desiccator and weigh. Repeat drying, cooling and weighing until constant weight (the difference between two consecutive weighings is less than 0.0005g). Take an appropriate amount of clear water sample into a constant-weight porcelain evaporating dish and evaporate to dryness on a water bath. The porcelain evaporating dish was dried in an oven at 180 °C for 2 h, then taken out and cooled to room temperature in a desiccator, and weighed. Repeat drying, cooling, Weigh until constant weight. 7.2.5 Presentation of analysis results Same as 7.1.4. 7.2.6 Precision Under the conditions of repeatability, the absolute difference between the two independent determination results obtained shall not exceed 10% of the arithmetic mean.

8 total hardness

8.1 Principle When there is chromium black T indicator in the water sample, it forms purple chelates with calcium and magnesium ions, and the instability constants of these chelates are greater than Instability constants for calcium and magnesium chelates of diaminetetraacetate. When pH=10, disodium EDTA forms first with calcium ions, and then with magnesium ions. At the end point of titration, the solution showed the blue color of chrome black T indicator. Since the reaction between calcium ions and chrome black T indicator can not show obvious color change when the titration reaches the equivalence point, so when the water sample When the magnesium content is very small, it is necessary to add a known amount of magnesium salt to make the color of the equivalence point clear. When calculating the result, subtract the added magnesium salt amount, or add a small amount of complexing EDTA magnesium salt to the buffer solution to ensure a clear endpoint.

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