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Quantification of Pesticide Residues in Some Soils of NARShingdi Area

M. Amin Uddin
Agrochemical and Environmental Research Division, Institute of Food and Radiation Biology (IFRB), Atomic Energy Research Establishment (AERE), GPO Box-3787, Dhaka-1000, Bangladesh

M. Alamgir Z. Chowdhury
Agrochemical and Environmental Research Division, Institute of Food and Radiation Biology (IFRB), Atomic Energy Research Establishment (AERE), GPO Box-3787, Dhaka-1000, Bangladesh

Z. Fardous
Agrochemical and Environmental Research Division, Institute of Food and Radiation Biology (IFRB), Atomic Energy Research Establishment (AERE), GPO Box-3787, Dhaka-1000, Bangladesh

M. Hasanuzzaman
Agrochemical and Environmental Research Division, Institute of Food and Radiation Biology (IFRB), Atomic Energy Research Establishment (AERE), GPO Box-3787, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

Results of residual pesticides in soils of Narshingdi district showed that out of 9 samples, only two contained organochlorines, namely DDT and DDE ranging from 0 - 0.726 and 0.404 - 0.563 µg/kg, respectively. While, organophosphorous, carbamate and pyrethroid residues were found below the detection limit. However, the contamination level of DDT and its metabolites was lower as compared to the IAEA/FAO/Codex Alimentarious Guide line value.

Keywords: Pesticide residues, Organochlorine, organophosphorous, Carbamate, Pyrethroid, Soil, Vegetables, Rice

Location: Narshingdi district, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil quality, Pesticide

Objectives:

To assess the types of pesticide residues (i.e. organochlorine, organophosphorous, carbamate and pyrethroid) used and their concentration levels in some selected soils extensively used for vegetables and rice cultivation in Narshingdi district.

Methodology:

Soil samples collected from nine selected spots of high land vegetables and low land paddy fields of Narshingdi district were immediately kept in refrigerator in glass containers in the laboratory. The samples were dried at room temperature in a fume cupboard and grounded to fine powder. Fifty g soil sample was extracted with 100 ml mixed solution of hexane and acetone (1 : 1) by using electronic shaker. The extract was treated with 5 g anhydrous sodium sulphate to remove traces of water. The extract was subjected to clean-up using florisil column chromatography (DFG Manual of Pesticide Residue Analysis 1987). The top 1.5 cm of the florisil column was packed with anhydrous sodium sulphate. Elution was done with 2% diethyl ether in hexane (5 ml/min). The eluate was concentrated in a rotary vacuum evaporator and transferred to glass-stoppered test tubes. Solvents were completely removed under mild nitrogen flow. The evaporated sample was dissolved in hexane and made to volume (1 ml) in a volumetric flask for subsequent gas chromatography. Determination of pesticide was done by Gas Chromatography (Hewlett Packard 5890 II) and High Performance Liquid Chromatography (Detector-waters 486, Pump-Waters 515) by injecting a portion of aliquot. Identification of the pesticide was carried out in relation to the retention time of the pure analytical standard supplied by International Atomic Energy Agency (IAEA), Austria. Quantification was made with a freshly prepared standard curve of the standard pesticide. GCECD (ECD- Electron Capture Detector) mode was used for the detection of Organochlorine pesticide residues, and HPLC was used for the detection of organophosphorus, carbamate and pyrethroid pesticide residues.

Source of Information: Bangladesh J. Sci. Res. 29(1): 85-88, 2016 (June)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Although, the Pesticide Rule (PR) 1985 of Bangladesh strictly prohibits any kind of unauthorized use of pesticides but because of lack of strong monitoring and proper evaluation facilities, this regulation did not work effectively to control hazardous pesticides. Proper regulatory enforcement of the relevant rules and provisions, and regular monitoring of residues would prevent misuses and could minimize the environmental problems.

Knowledge Management: Journal