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冷却水中苯并三氮唑（BTA）与Ag+生成微溶性沉淀，对莫尔（Mohr）法测定Cl-造成严重干扰。本文在HNO3介质中用Hg（SCN）2-FE（Ⅲ）为显色剂，经可见分光光度法测定冷却水中低含量Cl-，BTA不干扰。测定条件为：波长λ=460nm，在25mL测试溶液中，含5ml。Fe（Ⅲ），2mLHg（SCN）2饱和乙醇溶液；线性范围为0～3.2mg／LCl－；对NaNO2的干扰可用脲素消除。测定的相对标准偏差为1％～4％，回收率为96％～101％。
Benzotriazole (BTA) and Ag + in the cooling water formed slightly soluble precipitate, which caused serious interference with Cl- determination by Mohr method. In this paper, the HNO3 medium with Hg (SCN) 2-FE (Ⅲ) as a reagent, by visible spectrophotometry Determination of low concentrations of Cl-, BTA does not interfere. The measurement conditions were: wavelength λ = 460 nm, containing 5 ml in 25 mL of the test solution. Fe (Ⅲ), 2mLHg (SCN) 2 saturated ethanol solution; linear range of 0 ~ 3.2mg / LCl-; interference of NaNO2 available urea to eliminate. The relative standard deviations were 1% ~ 4% and the recoveries were 96% ~ 101%.