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Citation: YANG Bing-Yi, MO Jin-Yuan, ZOU Xiao-Yong, LAI Rong, HUANG Bao-Mei. Simultaneous Determination of Nitrite,Nitrate and Chlorophenols via Capillary Electrophoresis with a Dual-channel Electrochemical Detection System[J]. Chinese Journal of Applied Chemistry, ;2005, 22(5): 484-488. shu

Simultaneous Determination of Nitrite,Nitrate and Chlorophenols via Capillary Electrophoresis with a Dual-channel Electrochemical Detection System

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a Guangdong College of Pharmacy, Guangzhou;
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b School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guanzhou 510275

Corresponding author: MO Jin-Yuan,
Received Date: 26 June 2004
Available Online: 26 August 2004
Fund Project: 国家自然科学基金(29675033) (29675033)广东省科技计划(2004B1041027)资助项目 (2004B1041027)

A novel method was presented for simultaneous determination of nitrite,nitrate and chloro-phenols by means of capillary electrophoresis combined with a dual-channel electrochemical detection system.Two detectors,including an amperometric detector and a conductivity detector,were connected in parallel to the same capillary electrophoresis system and were simultaneously performed for detecting all the samples.The effects of some important factors such as buffer,working electrode,working potential and separation voltage on separation were investigated.The results show that under the optimum condition of 25 μm (i.d.)×70 cm (l.) capillary,13 kV separation voltage,15.0 mmol/L borax-15.5 mmol/L KH₂PO₄(pH=8.6) buffer,PAD modified carbon paste electrode and 1.0 V(vs.SCE) detection potential (amperometric detection),six samples were eluted in 14 min,and the detection limits were 0.02~0.05 mg/L.The response was linear in the range of 0.05~30.0 mg/L.The relative standard deviations (n=8) of peak current and migration time were 2.0%~3.4%.The method was successfully applied to analyze waste water samples with satisfactory assay results.Sample recovery rates were 97.2%~106%.
- dual-channel electrochemical detection,
- nitrite,
- nitrate,
- chlorophenol
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