目的:建立了催化动力学光度法测定水样中痕量 Cr(Ⅵ)的新方法.方法:在硫酸介质中,痕量 Cr(Ⅵ)催化过硫酸铵氧化邻甲氧基酚显色,其化合物的最大吸收波长为513 nm.结果:方法的线性范围为0.016～1.6 μg/25 ml Cr(Ⅵ),检出限为5.42×10-10g/ml Cr(Ⅵ),相对标准偏差(RSD)＜3.27%,样品加标回收率为97.6%～101.1%.结论:该法用于环境水样中微量铬含量的测定快速、准确、简便.
摘要(英文)：
Objective :A new catalytic photometric method for the determination of trace chromium(Ⅵ) was established. METHODS:O-methoxyphnol was oxidized by ammonium persulfate under the catalysis of trace chromium(Ⅵ) in H 2SO 4 medium,the colored product revealed the maximum absorption peak at 513nm. RESULTS: The linear range and detection limit were 0.016～1.6 μg/25 ml and 5 42×10 -10 g/ml respectively. The relative standard deviation(RSD) was found to be less than 3.27% and the standard material-added recovery rate was from 97.6% to 101.1% .CONCLUSI...
