Determination of Trace Chromium (Ⅵ) in Drinking Water by Extraction-Spectrophotometry / 环境与健康杂志

ABSTRACT

Objective To establish a simple and rapid method for determination of trace chromium(Ⅵ) in drinking water. Methods In the weak acid solution containing n-butyl alchhol,trace chromium (Ⅵ) in the water connected with diphenylcarbazide and sodium dodecyl sulfate into purplish red ternary iron compound,which could be extracted by chloroform and quantified at wavelength of 550 nm. Results The detection limit was 0.001 mg/L,the RSDs were 1.1%-1.4% and the recovery rate was 96%-113%. Conclusion The method was rapid,simple and the sensitivity and accuracy will meet the requirement of standard test methods for drinking water.