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基于铬 ( )在稀盐酸介质中氧化盐酸羟胺产生亚硝酸根 ,而亚硝酸根与对氨基苯磺酸重氮化后可与 α-萘胺偶联产生粉红色偶氮染料 ,提出了分光光度法测定铬 ( )的新方法。研究表明 :铬( )浓度在 0～ 0 .0 0 1 g/L内服从比耳定律 ,其线性相关系数 γ为 0 .99998,表观摩尔吸光度 ε52 0 为3.442 4× 1 0 4 L· mol-1· cm-1。所拟方法可用于水样中微量铬 ( )的测定 ,结果令人满意。
Oxidation of hydroxylamine hydrochloride in dilute hydrochloric acid medium produces nitrite based on chromium (II), while diazonium of nitrite and p-aminobenzenesulfonic acid can be coupled with α-naphthylamine to produce a pink azo dye, giving a spectrophotometric Determination of chromium () a new method. The results showed that the linear correlation coefficient γ was 0.99998 and the apparent molar absorptivity ε52 0 was 3.442 4 × 10 4 L · mol, which was obeyed by Beer’s law at a concentration of 0-0.01 g / L -1 · cm -1. The proposed method can be used for the determination of trace chromium (Ⅵ) in water samples with satisfactory results.