摘要
探讨紫外可见分光光度法测定水中六价铬的最佳线性范围。GB 7467–1987规定以二苯碳酰二肼为显色剂,用紫外可见分光光度法测定水中的六价铬,实践表明,在标准规定的浓度区间内,测量精密度和准确度不能达到标准要求。大量的实验数据表明此法测定水中六价铬的最佳线性范围为0.05~0.4μg/mL。
The optimum range of the concentration for determining hexavalent chromium in water by UV–Vis spectrophotometry was discussed. UV-Vis spectrometry was used with diphenylcarbazide as the chromogenic agent in GB7476–1987 to determine hexavalent chromium in water, and in the range of hexavalent chromium concentration, the detection precision and accuracy did not meet the demand of the standard. By analysizing a lardge amount of test datas, it showed that the optimal linear range for the determination of hexavalent chromium in water by this method was 0.05–0.4 μg/mL.
引文
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