摘要
详细实验了铬（Ⅵ) 与对氨基二乙基苯胺氧化显色反应的条件。实验结果表明：铬（Ⅵ）与对氨基二乙基苯胺反应形成的红色产物在 554 nm处有最大吸收。表观摩尔吸收系数为 3．3 × 104L·mol-1·cm-1；线性范围为0～1.6 mg／L。实验了采用全差示光度法测定水中铬的条件，用于某湖水中 4．07 μg/L的铬测定时，相对标准偏差为 3．4％（n=6）。测定结果与二苯胺基脲法的测定结果相比令人满意。
In this work the oxidative color reaction of Cr(Ⅵ) with p-amino-N,N-diethylani- line has been studied in detail. It is found that Cr(Ⅵ) reacts with the mentioned reagent to form a red product in the presence of alcohol. Its apparent molar absorptivity is 3. 3×104 L. mol-1. cm-1 at 554 nm. Beer's law is obeyed in the range of Cr(Ⅵ) 0~1. 6 mg/L. The pro- posed method has been used for the determination of Cr in water by total differential spec- trophotometric method. The analytical results indicate a precision of 3. 4% (n=6) for the determination of 4.07 μg/L Cr in lake water. The determination results are in good agree- ment with those of the diphenyl carbazine method.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1997年第2期208-211,共4页
Chinese Journal of Analytical Chemistry
关键词
铬
对氨基二乙基苯胺
全差示光度法
水
Chromium, p-amino-N, N-diethylaniline, total differential spectrophotometric method, water
