Carbofuran: analytical methods and its determination in natural water samples by flow injection DPA(Ⅲ)-H_2SO_4 chemiluminescence

摘要

This study proposes, a simple, rapid and sensitive chemiluminescent (CL) method for determination of carbofuran based on diperiodatoargentate(III) (DPA)-sulfuric acid (H2SO4) reaction coupled with flow injection (FI) methodology. Under optimum conditions, a linear standard curve is achieved in the range of 0.001-8.0 mg L-1 (R-2= 0.9994 (n = 11) with relative standard deviation (RSD) of 1.4-3.7% (n = 4)), a limit of detection (LOD) 5.0 x 10(-4) mg L-1 (S/N = 3) and injection throughput 180 h(-1). The proposed method was applied satisfactorily for the analysis of carbofuran in freshwater samples using solid phase extraction (SPE) technique with the recoveries of 94-110% (% RSD = 1.7-3.8, n = 4). A possible CL reaction mechanism has also been discussed briefly.