二苯碳酰二肼分光光度法测定鸡饲料中的微量铬(Ⅵ)

Determination of Trace Chromium( Ⅵ) in Chicken Feed by1,5-Diphenylcarbazide Spectrophotometry

采用二苯碳酰二肼分光光度法测定鸡饲料中微量铬（Ⅵ）。经试验确定最佳试验条件为：1∶1磷酸0.5mL,1∶1硫酸0.3mL,波长为540nm。铬的含量在0.008~0.4μg·mL-1范围内与吸光度A呈良好的线性关系,标准工作曲线为y=0.0112x＋0.019,相关系数为r=0.9996。加标回收率为99.59%~101.12%。此方法操作简单,测定快速,测定结果的准确度和精密度较高。

Using biphenyl earbonyl 2 hydrazine spectrophotometer method determination of trace chromium in feed. Through experiment to determine the best conditions for： 1 ： 1 phosphoric acid 0.5 ml, 1 ： 1 sulfuric acid 0.3 ml, wavelength of 540 nm . At the content of chromium range in 0.008 - 0.4μg·mL- 1 ,between content andA values showed a good linear relationship, This experiment standard working curve for y = 0.0112 ＋ 0.019 x, the correlation eoefficiem ofr = 0.9996. Standard addition recovery rate was 99.59% - 101.12%. This method is simple, rapid, high accuracy and precision of testing results.