Metasilicate detection

This standard specifies the chromaticity, odor and taste, 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 Nitrates, 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, 126Ra radioactivity, Escherichia coli, Streptococcus faecalis, 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. Prescribed l mg/1 The color that Pt [exists in the form of (PtCl)] has as one chromaticity unit is called 1 degree. Even slight turbidity can interfere with the determination, so when measuring turbid water samples, it is necessary to first centrifuge them to make them clear. 2.2 Reagents and Materials Unless otherwise specified, all 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: PtClR) 2.2.2.2 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 cobalt chloride (CoCl. · 6H, O), dissolve them in 100 mL of water, add 100 mL of hydrochloric acid (ppo=1.19 g/mL), and dilute to 1000 mL with water. 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: with a sensitivity of 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. 2.4.2 Determination: Take another 11 colorimetric tubes and add 0 mL, 0.50 mL, 1.00 mL, 1.50 ml., and 2.00 mLl of platinum cobalt standard solution (2.2.3), respectively

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