Rapid determination of chromium(VI) in electroplating waste water by use of a spectrophotometric flow injection system.
A new rapid and sensitive FI method is reported for spectrophotometric determination of trace chromium(VI) in electroplating waste water. The method is based on the reaction of Cr(VI) with sodium diphenylamine sulfonate (DPH) in acidic medium to form a purple complex (lambda(max) = 550 nm). Under the optimized conditions, the calibration curve is linear in the range 0.04-3.8 microg ml(-1) at a sampling rate of 30 h(-1). The detection limit of the method is 0.0217 microg ml(-1), and the relative standard deviation is 1.1% for eight determinations of 2 microg ml(-1) Cr(VI). The proposed method was applied to the determination of chromium in electroplating waste water with satisfactory results.
Yuan
Dong
D
Material and Chemical Engineering Department, Sichuan University of Sciences & Engineering, Sichuan 643000, Zigong, PR China. yuandong68@126.com
Fu
Dayou
D
Wang
Rong
R
Yuan
Jigang
J
D001331:Automation; D002138:Calibration; D002412:Cations; D002852:Chromatography, Ion Exchange / Q000379:methods; D002857:Chromium / Q000737:chemistry*; D004595:Electroplating; D004867:Equipment Design; D008670:Metals / Q000737:chemistry; D008956:Models, Chemical; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D014867:Water / Q000737:chemistry*; D014873:Water Pollutants / Q000032:analysis / Q000737:chemistry
D002412:Cations; D008670:Metals; D014873:Water Pollutants; D014867:Water; D002857:Chromium