Groundwater vulnerability to pesticides in Northwest Bangladesh
The transport and leaching potential hazards of various pesticides were studied in a shallow unconfined aquifer located in Northwest Bangladesh. Pesticide leaching potential was quantified using a one-dimensional advective–dispersive transport equation for a non-conservative chemical that follows fi...
| Main Authors: | , |
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| Format: | Journal Article |
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Springer
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/10408 |
| _version_ | 1848746223897411584 |
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| author | Anwar, Faisal Yunus, Anika |
| author_facet | Anwar, Faisal Yunus, Anika |
| author_sort | Anwar, Faisal |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The transport and leaching potential hazards of various pesticides were studied in a shallow unconfined aquifer located in Northwest Bangladesh. Pesticide leaching potential was quantified using a one-dimensional advective–dispersive transport equation for a non-conservative chemical that follows first-order decay and linear adsorption in soils. Leaching potential index (LPI) was calculated for 69 sites in the study area to evaluate the relative vulnerability to pesticide leaching and to prioritize sites for model study and soil sampling. The numerical ranks of computed LPI were grouped by quantiles into very high, high, moderate, low and very low categories; and based on these rankings, the most vulnerable site was selected. The fate and transport of pesticides in this most vulnerable site was modeled using MT3D. The model results indicate that pesticides with high sorptivity and moderate to high persistence have low potential impact on groundwater. Top soils are found to be particularly vulnerable to the accumulation of organochlorine pesticides. Results also revealed that decreasing the soil organic matter and increasing the half-life of the pesticides at deeper depths did not make any significant change. Finally, six soil samples were collected from the same site at depths of 0.0, 1.5, 3.0, 4.5, 6.0, and 7.5 m for the analysis of pesticide residues. The soil–water was extracted from the samples following standard extraction technique and tested using gas chromatography (GC) and high-performance liquid chromatography (HPLC) for pesticide residues. Results showed no trace of pesticide residues in the soil–water; however, a few unknown peaks were detected indicating the use of some unknown brand of chemicals in the study area. |
| first_indexed | 2025-11-14T06:29:51Z |
| format | Journal Article |
| id | curtin-20.500.11937-10408 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:29:51Z |
| publishDate | 2013 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-104082017-09-13T14:50:54Z Groundwater vulnerability to pesticides in Northwest Bangladesh Anwar, Faisal Yunus, Anika Sorption Pesticide Leaching Vulnerability Soil–water Groundwater Bangladesh The transport and leaching potential hazards of various pesticides were studied in a shallow unconfined aquifer located in Northwest Bangladesh. Pesticide leaching potential was quantified using a one-dimensional advective–dispersive transport equation for a non-conservative chemical that follows first-order decay and linear adsorption in soils. Leaching potential index (LPI) was calculated for 69 sites in the study area to evaluate the relative vulnerability to pesticide leaching and to prioritize sites for model study and soil sampling. The numerical ranks of computed LPI were grouped by quantiles into very high, high, moderate, low and very low categories; and based on these rankings, the most vulnerable site was selected. The fate and transport of pesticides in this most vulnerable site was modeled using MT3D. The model results indicate that pesticides with high sorptivity and moderate to high persistence have low potential impact on groundwater. Top soils are found to be particularly vulnerable to the accumulation of organochlorine pesticides. Results also revealed that decreasing the soil organic matter and increasing the half-life of the pesticides at deeper depths did not make any significant change. Finally, six soil samples were collected from the same site at depths of 0.0, 1.5, 3.0, 4.5, 6.0, and 7.5 m for the analysis of pesticide residues. The soil–water was extracted from the samples following standard extraction technique and tested using gas chromatography (GC) and high-performance liquid chromatography (HPLC) for pesticide residues. Results showed no trace of pesticide residues in the soil–water; however, a few unknown peaks were detected indicating the use of some unknown brand of chemicals in the study area. 2013 Journal Article http://hdl.handle.net/20.500.11937/10408 10.1007/s12665-013-2708-1 Springer restricted |
| spellingShingle | Sorption Pesticide Leaching Vulnerability Soil–water Groundwater Bangladesh Anwar, Faisal Yunus, Anika Groundwater vulnerability to pesticides in Northwest Bangladesh |
| title | Groundwater vulnerability to pesticides in Northwest Bangladesh |
| title_full | Groundwater vulnerability to pesticides in Northwest Bangladesh |
| title_fullStr | Groundwater vulnerability to pesticides in Northwest Bangladesh |
| title_full_unstemmed | Groundwater vulnerability to pesticides in Northwest Bangladesh |
| title_short | Groundwater vulnerability to pesticides in Northwest Bangladesh |
| title_sort | groundwater vulnerability to pesticides in northwest bangladesh |
| topic | Sorption Pesticide Leaching Vulnerability Soil–water Groundwater Bangladesh |
| url | http://hdl.handle.net/20.500.11937/10408 |