Organochlorine pesticides and metabolites in young leaves of Mangifera indica from sites near a point source in Coast Region, Tanzania
| dc.contributor.author | Mahugija, John A.M. | |
| dc.contributor.author | Kishimba, Michael A. | |
| dc.date.accessioned | 2018-09-05T12:01:54Z | |
| dc.date.available | 2018-09-05T12:01:54Z | |
| dc.date.issued | 2007 | |
| dc.description.abstract | Young leaves of Mangifera indica (mango tree) from nine sites were used as bioindicators of local atmospheric contamination by organochlorine pesticides and metabolites from a point source, an old storage site at Vikuge farm in Tanzania. Sample extracts were analyzed by GC-ECD and GC-MS. The concentrations ranged 2.7–649 ng g-1 p,p’-DDT, below detection limit (bdl)–290 ng g-1 o,p’-DDT, 0.4–13 ng g-1 p,p’-DDE, bdl to 4 ng g-1 o,p’-DDE, 1–231 ng g-1 p,p’-DDD and 0.5–55 ng g-1 o,p’-DDD. The concentrations of other compounds were up to 3.9 ng g-1 pentachloroanisole, 1.3 ng g-1 a-HCH, 12 ng g-1 b-HCH and 2 ng g-1 g-HCH, on fresh weight basis. The compounds p,p’-DDT, p,p’-DDE, p,p’-DDD and o,p’-DDD were found in 100% of the samples, while pentachloroanisole, o,p’-DDT and o,p’-DDE were detected in 78%, 56% and 67% of the samples, respectively. The low DDE/DDT ratios (0.01–0.20) in all samples indicate recent input of significantly non-degraded DDT from the point source. The low a-/g-HCH ratios (<0.3–0.7) in most samples indicate recent input of lindane (99% g-HCH). The slightly high a-/g-HCH ratios in some samples might be due to photochemical or bacterial transformation of g-HCH to a-HCH, or could reflect input of technical HCH. The very strong positive correlations in the concentrations of p,p’-DDT, p,p’-DDE, p,p’-DDD, o,p’-DDT, o,p’-DDE and o,p’-DDD (r = 0.91–0.98, n = 18, p < 0.01) indicate that they have a common source. The results suggest that young mango leaves are suitable bioindicators of recent inputs of organochlorine contaminants from a point source. | en_US |
| dc.description.sponsorship | The German Academic Exchange Service (DAAD) | en_US |
| dc.identifier.citation | Marco, J.A.M. and Kishimba, M.A., 2007. Organochlorine pesticides and metabolites in young leaves of Mangifera indica from sites near a point source in Coast region, Tanzania. Chemosphere, 68(5), pp.832-837. | en_US |
| dc.identifier.doi | https://doi.org/10.1016/j.chemosphere.2007.02.026 | |
| dc.identifier.issn | 0045-6535 | |
| dc.identifier.uri | http://hdl.handle.net/20.500.11810/4772 | |
| dc.language.iso | en | en_US |
| dc.publisher | Elsevier | en_US |
| dc.subject | Research Subject Categories::NATURAL SCIENCES | en_US |
| dc.title | Organochlorine pesticides and metabolites in young leaves of Mangifera indica from sites near a point source in Coast Region, Tanzania | en_US |
| dc.type | Journal Article | en_US |