TY - GEN
T1 - Speciation of Cr(III) and Cr(VI) in the presence of chromium azo dye Acid Yellow 99 by column solid phase extraction
AU - Cai, Qinhong
AU - Ng, Tsz Wai
AU - Wong, Kin Hang
AU - Wong, Po Keung
AU - Xiong, Ya
AU - Wang, Yonghua
AU - Zhang, Ying
PY - 2012
Y1 - 2012
N2 - A novel method, which determines the concentrations of speciated Cr(III) and Cr(VI) with the presence of Cr(III)-organic complexes (particularly chromium dyes), was developed based on a column solid phase extraction using Amberlite XAD-4 resin (XAD-4). Acid Yellow 99 (AY99), a chromium monoazo dye, used as a model organic compound, could be quantitatively recovered at pH 5 with low recoveries of Cr(III) and Cr(VI) (below 5%). After Cr(VI) being converted to Cr(III)-diphenylcarbazone (Cr-DPC) by 1, 5-diphenylcarbazide, Cr(VI) was quantitatively recovered at pH 1 with the recovery of Cr(III) below 5%. The recoveries of AY99, Cr(III) and Cr(VI) by the newly developed method were 94.7±1.7, 103.0±2.5 and 96.7±3.6%, respectively. In addition, the recoveries of organics (i.e. proteins, amino acids, and organic acids) complexing with chromium ion were all below 5% at pH 1 and had little interference to the selective determination of Cr(VI) concentration. The adsorption capacity and detection limit of XAD-4 for Cr(VI) was 281.6±2.8 μg g-1 and 1.37 μg L-1, respectively.
AB - A novel method, which determines the concentrations of speciated Cr(III) and Cr(VI) with the presence of Cr(III)-organic complexes (particularly chromium dyes), was developed based on a column solid phase extraction using Amberlite XAD-4 resin (XAD-4). Acid Yellow 99 (AY99), a chromium monoazo dye, used as a model organic compound, could be quantitatively recovered at pH 5 with low recoveries of Cr(III) and Cr(VI) (below 5%). After Cr(VI) being converted to Cr(III)-diphenylcarbazone (Cr-DPC) by 1, 5-diphenylcarbazide, Cr(VI) was quantitatively recovered at pH 1 with the recovery of Cr(III) below 5%. The recoveries of AY99, Cr(III) and Cr(VI) by the newly developed method were 94.7±1.7, 103.0±2.5 and 96.7±3.6%, respectively. In addition, the recoveries of organics (i.e. proteins, amino acids, and organic acids) complexing with chromium ion were all below 5% at pH 1 and had little interference to the selective determination of Cr(VI) concentration. The adsorption capacity and detection limit of XAD-4 for Cr(VI) was 281.6±2.8 μg g-1 and 1.37 μg L-1, respectively.
KW - Amberlite XAD-4
KW - Chromium ion speciation
KW - Cr(III)-organic complexes
KW - Flame atomic absorption spectroscopy (FASS)
UR - https://www.scopus.com/pages/publications/84866692724
U2 - 10.1109/iCBEB.2012.360
DO - 10.1109/iCBEB.2012.360
M3 - Conference contribution
AN - SCOPUS:84866692724
SN - 9780769547060
T3 - Proceedings - 2012 International Conference on Biomedical Engineering and Biotechnology, iCBEB 2012
SP - 1684
EP - 1687
BT - Proceedings - 2012 International Conference on Biomedical Engineering and Biotechnology, iCBEB 2012
T2 - 2012 International Conference on Biomedical Engineering and Biotechnology, iCBEB 2012
Y2 - 28 May 2012 through 30 May 2012
ER -