Surface water (including wastewater) detection

Standard Test Method for Drinking Water - Metal Index 1 Aluminum 1.1 Chromazurol S Spectrophotometer 1.1.1 Scope This standard specifies the use of Chromazurol S spectrophotometry to determine aluminum in drinking water and its source water. This method is applicable to the determination of aluminum in drinking water and its source water. The minimum detection mass of this method is 0.20 ug. If a 25 mL water sample is taken, the minimum detection mass concentration is 0.008 mg/L. Determination of copper, manganese, and iron interference in water. 1 mL of ascorbic acid (100 g/L) can eliminate interference from 25 ug of copper and 30 pug of manganese. 2 mL of oleic acid (10 g/L) can eliminate interference from 25 pg of iron. 1.1.2 Principle: In the pH range of 6.7-7.0, aluminum reacts with chrome azurol S in the presence of polyethylene glycol octylphenyl ether (OP) and brominated hexadecylpyridine (CPB) to form blue-green quaternary micelles, which are quantitatively quantified by colorimetry

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