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Abstract
A flow-injection procedure is described for the determination of carbaryl based on its inhibition effect on luminol-cobalt(II) chemiluminescence reaction in alkaline medium in the presence of hydrogen peroxide. The calibration data over the range 5.0 × 10−7 to 20 × 10−6 M give a correlation coefficient (r 2) of 0.9972 with relative standard deviations (RSD; n = 4) in the range of 1.0–2.1% with a limit of detection (3 × blank noise) of 2.37 × 10−7 M for carbaryl. The sample throughput was 120 h−1. The effects of some carbamates, anions, and cations were studied on luminol CL system for carbaryl determination. The proposed method has been applied to determine carbaryl in natural waters.
Acknowledgements
The authors are grateful to the Higher Education Commission, Pakistan for financial support in the form of Indigenous PhD Scholarship (IQC-03600101) and HEC research project (No. 20-639/R&D/06) under the National Research Programme for Universities.