Testing of beverages and natural mineral water for drinking

This standard specifies the chromaticity, odor, and taste of natural mineral water for drinking, including visible matter, turbidity, pH, total dissolved solids, total hardness, total alkalinity, 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, etc Nitrites, carbonates, and bicarbonates, sulfates, oxygen consumption, cyanide, volatile phenolic compounds, anionic synthetic detergents, mineral oils, bromates, sulfides, phosphates, total β Determination methods for radioactivity, fluoride, 11 * Ra radioactivity, coliform bacteria, fecal streptococcus, Pseudomonas aeruginosa, and Clostridium perfringens. This standard is applicable to the determination of indicators for drinking natural mineral water. 2. Determination of Chromaticity 2.1 Principle: A standard color column with the same color tone as natural water yellow is prepared using potassium chloroplatinate and cobalt chloride for visual colorimetric determination of water samples. The color of l mg/L Pt [present in the form of (PtCI,)] is specified as one chromaticity unit, called 1 degree. Even slight turbidity can interfere with the determination, so the turbid water sample needs to be centrifuged first to make it clear. 2.2 Reagents and materials Unless otherwise specified, the test reagents used in this method are analytical pure, and the water is Grade III water according to GB/T6682. 2.2.1 Potassium chloroplatinate (K, PtCl). 2.2.2 Cobalt chloride (CoCl. · 6H: O) . 2.2.3 Platinum cobalt standard solution; Weigh 1.246 g of potassium chloroplatinate (K; PtCl) and 1.000 g of dried oxidized diamond (CoCl · 6H: O), dissolve them in 100 mL of water, add 100 mL of hydrochloric acid (ps=1.19 g/mL), and bring to a constant volume of 1000 ml. The chromaticity of this standard solution is 500 degrees. 2.3 Instruments and equipment 2.3.1 Colorless stopper colorimetric tube: 50 mL. 2.3.2 Centrifuge. 2.3.3 Analytical balance; The sensitivity is 0.1 mg. 2.4 Analysis steps 2.4.1 Sample processing: Take 50 mL of transparent water sample and place it in a colorimetric tube. If the chromaticity of the water sample is too high, take a small amount of water sample, dilute with water, and compare the color. Multiply the result by the dilution factor

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