基于智能手机比色测定水环境中的六价铬

在酸性条件下,水样中的六价铬能够和显色剂二苯碳酰二肼反应生成紫红色络合物,该络合物溶液用自制的数字图像比色装置测定颜色值实现六价铬的现场快速检测。该方法在0.05 mg/L~1.00 mg/L范围内线性良好,方法检出限为0.02 mg/L,标准溶液10次测定结果的RSD为1.6%~7.9%,实际水样加标回收率为94.7%~102%。用该方法与国标法同时测定实际水样,结果无显著差异。

Determination of Hexavalent Chromium in Water Environment Based on Smartphone Colorimetry

In acidic condition, hexavalent chromium in water samples reacted with diphenylcarbazide to form a purple red complex. The complex solution was placed in a self made digital image colorimeter to determine the color value for realizing field fast detection of hexavalent chromium. This method had a good linear range in the concentration from 0.05 mg/L to 1.00 mg/L. The method detection limit was 0.02 mg/L. The RSDs of 10 times measurement of standard solutions were from 1.6% to 7.9%. The recoveries of practical samples were from 94.7% to 102%. Comparing this method with the national standard method in determining practical samples, the results had no significant difference.