摘要
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513nm。结果:方法的线性范围为01016～116μg/25ml Cr(Ⅵ),检出限为5142×10-10g/ml Cr(Ⅵ),相对标准偏差(RSD)<3.27%,样品加标回收率为9716%～10111%。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。
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% .CONCLUSION: This method was rapid ,accurate and convenient for the determination of trace chromium(Ⅵ) in several environment water samples.
出处
《微量元素与健康研究》
CAS
2005年第2期44-45,共2页
Studies of Trace Elements and Health
关键词
铬
催化光度法
邻甲氧基酚
chromium
catalytic photometry
O-methoxyphnol
