کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1166594 | 1491122 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Native vs photoinduced chemiluminescence in dimethoate determination Native vs photoinduced chemiluminescence in dimethoate determination](/preview/png/1166594.png)
The determination of dimethoate using either its native chemiluminescent (CL) properties or its photoinduced chemiluminescence obtained by irradiation with a 15 W low-pressure mercury lamp was studied. Thereby, two flow injection systems (FIA) with and without irradiation were exhaustively optimized and their analytical characteristics studied. Better sensitivity and selectivity was found in absence of irradiation, due to the enhancing effect of hexadecylpyridinium chloride (HPC), which acted as a sensitizer. In the developed FIA-CL system, the alkaline hydrolysis of dimethoate with NaOH was performed on-line in presence of HPC. The oxidation of the product of hydrolysis with Ce(IV) in hydrochloric medium induced chemiluminescence. The method provided a limit of detection of only 0.05 ng mL−1 without any pre-treatment. However, the combination with solid phase extraction allowed the removal of some potential interferents as well as the preconcentration of the pesticide. Finally, the developed method was successfully applied to natural waters with recoveries between 95 and 108%.
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► Comparison between native and photoinduced chemiluminescence of dimethoate.
► Hexadecylpyridinium enhanced greatly the chemiluminescence.
► Solid phase extraction allowed the successful determination of dimethoate in water.
Journal: Analytica Chimica Acta - Volume 710, 13 January 2012, Pages 81–87