Determination of carbamate residues in water by gas chromatography with electron capture detector (gc-ecd): a case study in talata iboaka, fianarantsoa, madagascar

Research concerning the residue of carbamate in water from central production samples from Talata Iboaka, Fianarantsoa province has been conducted. The aim of this study was to analyze, identify and evaluate carbamate insecticides in water. Water samples were extracted using separator funnel with 15% (v/v) dichloromethane/n-hexane. Clean up was done using a chromatography column with florisil, and the residues were derivatized with 1- fluoro-2,4-dinitrobenzene. The derivatives were determined by gas chromatography with Electron Capture Detector (GC- ECD). The results of the study revealed that the average concentration of carbamate pesticides in all carbamate residues in water samples ranged from 0.001 to 2.508ppm in all samples investigated. Except for methonyl and carbaryl, the water sample taken from the white cabbage field was below the established water standard. The results of this study indicated that, in spite of more careful usages, of pesticides especially carbamate residues still pollute the environment resulting in contamination of these white cabbage fields.