|
OceanDocs >
Africa >
African Marine Science - Oceanography - Fishery >
Miscellaneous >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1834/819
|
| Title: | Organochlorine pesticides in residues in waters from the coastal area of Dar es Salaam and their effect on aquatic biota |
| Authors: | Mwevura, H.
Othman, O.C.
Mhehe, G.L. |
| ASFA Terms: | Pesticides
Water pollution |
| Issue Date: | 2002 |
| Citation: | Tanzania Journal of Science, 28 (2), p. 117-130 |
| Abstract: | Water samples were collected from Msimbazi and Kizinga rivers in Dar es
Salaam and from the coastal marine environment receiving waters from
these rivers during both the wet season and the dry season and analysed
for various organochlorine pesticide residues using GC-ECD. The pesticides
p,p’-DDE, p,p’-DDT, dieldrin and g-HCH were the only organochlorines
detected at significantly greater concentrations above detection limits.
There was a marked difference on the frequency of pesticide residue
detection during the two seasons. All the wet season samples and 37.5%
of the dry season samples contained p,p’-DDE at concentrations ranging
from 0.05 to 0.45mg/l and 0.08 to 0.20mg/l respectively. p,p’-DDT was
detected in 25% of the dry season samples at a concentration range of
0.1–0.4mg/l and in 81% of the wet season samples at concentrations
ranging from 0.1– 0.3mg/l. Dieldrin and g-HCH were only detected during
the wet season. Dieldrin amounts ranging between 0.2 and 2.5mg/l were
detected in all wet season samples whereas g-HCH (0.2mg/l) was found in
only one wet season sample. Recoveries of all pesticides ranged from 65
to 108%.
This study showed that the current levels of pesticides residues in the
studied waters have no acute effects to aquatic biota. However, the levels
of total DDT and dieldrin during the wet season might result in chronic
effects to aquatic biota. |
| URI: | http://hdl.handle.net/1834/819 |
| Appears in Collections: | Miscellaneous
|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
|
