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《Journal of Analytical Science》 2006-04
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Determination of Positional Isomers of Nitrophenol by Capillary Electrophoresis with Square-wave Amperometric Detection

LIU Qi-wen,XIE Tian-yao~*,ZENG Nuan-xi,LIU Qiu-ying (School of Chemistry and Chemical Engineering,Sun Yat-sen University,Guangzhou 510275)  
A rapid,sensitive and robust method of separation and determination of three positional isomers of nitrophenol by capillary electrophoresis with square-wave amperometric detection(SWAD) was developed.The positional isomers of nitrophenol were baseline separated within 6 min under the following separation conditions:2 mmol/L Na_2HPO_4+0.4 mmol/L NaH_2PO_4+2 mmol/L β-CD(pH=7.9)as the running buffer,+11 kV as the separation voltage and E_b=1.0 V as the square wave balance potential.The effects of the component and pH of the running buffer,the concentration of β-CD in buffer solution were discussed in detail.The calibration curves of m,p,and o-nitrophenol showed good linearity in the range from 0.5,1.0 and 1.6 to 80 mg/L with the LOD=0.2,0.3 and 0.6 mg/L,respectively.The mechanism of the host-guest action between β-CD and m,p,and o-nitrophenol was also discussed.This method was applicable to the analysis of industry waste wate including nitrophenol.
【Fund】: 广东省自然科学基金(No.031589)
【CateGory Index】: O658.9;O621.4
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