[Separation of Cr( VI) and organic Cr(III) in natural water by weak basic anion exchange resin and determination by ICP-AES].
For the separation and determination of inorganic Cr(VI) and organic Cr(III) in natural water, a sensitive and selective method was developed using a weak basic anion exchange resin micro-column and inductively coupled plasma atomic emission spectrometry (ICP-AES). Under optimized conditions, organic Cr(III) and inorganic Cr( VI) were retained on the column, and eluted with 1. 0 mol x L(-1) HCl and 2. 0 mol x L(-1) NH4 NO3 +0. 5 mol x L(-1) NH3 x H2O respectively. Then the concentrations of Cr(VI) and organic Cr(III) were determined by ICP-AES. The detection limits of organic Cr( III ) and inorganic Cr(VI) were 1. 1 and 1. 4 microg x L(-1) , and relative standard deviations(RSD) were 3. 8% and 5. 6% respectively. The proposed method has been applied to the determination and separation of chromium in several practical water samples with a recovery between 90. 4% and 106. 3%.
Ma
Hong-mei
HM
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
Zhu
Zhi-liang
ZL
Zhang
Rong-hua
RH
Zhao
Jian-fu
JF