Flow‐Injection Chemiluminescence Study of Luminol–Hydrogen Peroxide–Carbendazim System

Abstract

A new flow‐injection chemiluminescence (CL) method is described for the determination of carbendazim. The method is based on the CL reaction of luminol and hydrogen peroxide (H₂O₂). Carbendazim can greatly enhance the chemiluminescence intensity in sodium hydroxide–sodium dihydrogen phosphate (NaOH–NaH₂PO₄) medium (pH=12.6). Under the optimum conditions, the linear range for the determination of carbendazim is 2.00×10⁻⁸ to 2.00×10⁻⁶ g mL⁻¹ with a detection limit (S/N=3) of 7.24×10⁻⁹ g mL⁻¹. The relative standard deviation is 1.8% for 1.0×10⁻⁷ g mL⁻¹ carbendazim (n=8). The proposed method has been applied to the determination of carbendazim in tap‐water samples. Furthermore, the possible enhanced CL mechanism is discussed by examining the CL spectra and fluorescence spectra.

Keywords:

• Carbendazim
• chemiluminescence
• flow‐injection analysis

Acknowledgments

This project was financially supported by Program for New Century Excellent Talents in University, the Science Foundation of Ministry of Science and Technology, P.R. China (no. 2001BA804A26), the Science and Technology Key Project of Fujian Province, P.R. China (no. 2002Y051, 2003Y005) and Supporting Program for Scientific Research of Young Teachers from Nanping Teacher's College, P.R. China (no. XQL05028).