Development of an FIA system with amperometric detection for determination of bentazone in estuarine waters

Abstract

On the basis of its electrochemical behaviour a new flowinjection analysis (FIA) method with ampero-metric detection has been developed for quantification of the herbicide bentazone (BTZ) in estuarine waters. Standard solutions and samples (200 L) were injected into a water carrier stream and both pH and ionic strength were automatically adjusted inside the manifold. Optimization of critical FIA conditions indicated that the best analytical results were obtained at an oxidation potential of 1.10 V, pH 4.5, and an overall flow-rate of 2.4 mL min -1 . Analysis of real samples was performed by means of calibration curves over the concentration range 2.510 -6 to 5.010 -5 mol L -1 , and results were compared with those obtained by use of an independent method (HPLC). The accuracy of the amperometric determinations was ascertained; errors relative to the comparison method were below 4% and sampling rates were approximately 100 samples h -1 . The repeatability of the proposed method was calculated by assessing the relative standard deviation (%) of ten consecutive determinations of one sample; the value obtained was 2.1%.

Recent Development on the Electrochemical Detection of Selected Pesticides: A Focused Review

“…Electroanalytical techniques have been used for the determination of bentazone at different electrodes with or without surface modification [31,[86][87][88][89][90][91][92][93]. Overview of the electrochemical methods of analyses for bentazone determination is summarized in the Table 3.…”

“…Similarly, an amperometric detection coupled to a flow injection analysis(FIA) system at a glassy carbon electrode has been proposed by Cerejeira et al [93]. Analysis of bentazone in estuarine waters was performed by means of calibration curves over the concentration range 2.50 to 50.0 µM at an oxidation potential of 1.10 V in acetate buffer solution (ABS) of pH 4.5.…”

Exploring electrocatalytic proficiencies of CuO nanostructure for simultaneous determination of bentazone and mexacarbate pesticides

“…The toxicological studies have manifested that bentazone has been proved a highly toxic entity by dermal absorption and by ingestion in mammals (Harrison et al 2012). The reported studies have shown different toxicological effects of bentazone that include diarrhea, vomiting, weakness, trembling, eye, skin irritation and respiratory tract infections (Cerejeira et al 2002). The over doze of this harmful pesticide may cause renal failure, acute hepatitis and even demise (Liem et al 2011).…”