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| Titel: |
Groundwater contamination by ricefield pesticides and some influencing factors |
| Auteur: |
Castaneda, A. R. Bhuiyan, S. I. |
| Verschenen in: |
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering |
| Paginering: | Jaargang 31 (1996) nr. 1 pagina's 83-99 |
| Jaar: |
1996-01 |
| Inhoud: |
An analysis of 270 groundwater samples collected over 1989-1991 was made for determining ricefield pesticide residue concentrations. The samples were collected from 53 tubewells located within ricefield boundaries in irrigated and rainfed areas and used for domestic water supply. Mean concentrations of six commonly used pesticides ranged from 0.002 ppb for chlorpyrifos to 0.209 ppb for monocrotophos. The maximum concentration found in a single sample was 3.19 ppb for monocrotophos. Endosulfan was present in 79% and monocrotophos in 54% of all samples. Irrigated environment, lighter soil texture, and wet season rice culture condition contributed to higher concentrations of pesticides in the groundwater. Increasing tubewell depths generally indicated a decreasing concentration trend. The study indicates that pesticides in groundwater samples had their residues in excess of the limit of 0.1 ppb for single pesticide and 0.5 ppb for multiple pesticides set by international agencies. Using these standards, groundwater of the study site might be considered to be threatened by excessive use of ricefield pesticides. However, toxicological standards established by FAO/WHO indicate that the water is safe for human consumption. Development of management models capable of predicting residue behaviour within the soil profile is necessary. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 16 gevonden artikelen
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