Simultaneous Determination of Nitrophenol Isomers Using Ultra-thin Carbon Paste Electrode Modified with Chitosan Carbon Nanotubes Composite
  
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DOI:10.3969/j.issn.1004-4957.年份.月份
KeyWord:chitosan  carbon nanotubes  ultra-thin carbon paste electrode  nitrophenol isomers  simultaneous determination
  
AuthorInstitution
DONG Xiao-ya,WANG Zhen-hui,QIU Bai-jing,GUAN Xian-ping 江苏大学现代农业装备与技术省部共建教育部重点实验室
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Abstract:
      Based on nickel chromium substrate,a novel electochemical sensor was prepared by coating chitosan on the surface of nanotubes modified ultra thin carbon paste electrode(CTS-CNTs-UTCPE),and this sensor was further employed for electrochemical determination of o-,m- and p-nitrophenol.Electrochemical behaviors of o-,m- and p-nitrophenol on CTS-CNTs-UTCPE were investigated by cyclic voltammetry(CV)and semi-differential voltammetry method.Effects of supporting electrolyte,pH value,onset potential,scan rate and accumulation time on the result of detection were explored.Compared to nickel chromium electrode,ultra thin carbon paste electrode(UTCPE)and carbon nanotubes modified ultra thin carbon paste electrode(CNTs-UTCPE),the new electrode displays a larger oxidative current response to o-,m- and p-nitrophenol in pH 5.72 B-R solution,probably due to the synergistic effects between chitosan and carbon nanotubes.Under the optimum conditions,the presented sensor exhibited wide linear responses to o-nitrophenol ranging from 4.0×10-7mol/L to 8.0×10-5 mol/L with a detection limit(S/N=3)down to 2.3×10-7 mol/L,to m-nitrophenol ranging from 4.0×10-7 mol/L to 8.0×10-5 mol/L,with a detection limit down to 2.9×10-7 mol/L,to p-nitrophenol ranging from 8.0×10-7 to 8.0×10-5 mol/L with a detection limit down to 6.7 ×10-7 mol/L.This presented sensor also showed a good stability and an excellent selectivity,and was successfully applied in the simultaneous determination of o-,m- and p-nitrophenol in artificial water samples.
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