Assessment of heavy metals distribution in sediment and water, and their bioaccumulation in thumbprint emperor (lethrinus harak) in the msimbazi bay, Dar es salaam

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dc.contributor.authorAlfred, James
dc.date.accessioned2019-11-07T09:28:30Z
dc.date.accessioned2020-01-07T15:45:06Z
dc.date.available2019-11-07T09:28:30Z
dc.date.available2020-01-07T15:45:06Z
dc.date.issued2018
dc.descriptionAvailable in print form, East Africana Collection, Dr. Wilbert Chagula Library, Class mark (THS EAF QC1080.T34.A 583)en_US
dc.description.abstractThis study aimed at investigating the distribution, influencing factors and concentration levels of cadmium (Cd), lead (Pb), zinc (Zn) and chromium(Cr) in marine sediments, seawater and fish (Lethrinus harak) in the Msimbazi Bay of the Dar es Salaam coast.The samples for heavy metals analysis were collected, prepared, digested accordingly and analyzed using AAS. The obtained results found that, marine sediments had higher levels of zinc (105.16 ±11.83 mg/kg) at sampling station OM (Mangrove creek) compared to other sampling stations in the bay and their concentration levels were found to be in the order of Zn > Pb > Cr > Cd. In the seawater, Pb and Zn were detected within the range considered as natural in the ocean and their concentrations were 1.84 and 19.35µg/L, respectively. Comparatively, concentration levels of heavy metals in sediments were higher than those of seawater. However, concentrations in both compartments were below the maximum permissible levels proposed by USEPA, CCME and, ANZECC and ARMCANZ with a decreasing concentration trend from the river mouth (mangrove creek) to offshore areas. Relationships were statistically observed between concentration of heavy metals in seawater and sediments against their physico-chemical characteristics. With emphasis on fish muscles as edible parts for human consumption, the concentration levels of heavy metals were; Zn (0.89 ± 0.18) > Pb (0.18 ± 0.09) > Cr (0.1 ± 0.04) > Cd (0.05 ± 0.012) µgg-1. Generally, concentration levels of heavy metals in all fish tissues examined (liver, gills, kidney and muscles) were below the permissible levels recommended by FAO and WHO.Despite the fact that the study findings on the levels of metals in all investigated samples were below permissible levels recommended by international organizations, there is still a need to put mechanisms in place to monitor contamination of heavy metals in the Msimbazi catchment area and it’s Bay.en_US
dc.identifier.citationAlfred, J (2018) Assessment of heavy metals distribution in sediment and water, and their bioaccumulation in thumbprint emperor (lethrinus harak) in the msimbazi bay, Dar es salaam.Master dissertation, University of Dar es Salaam, Dar es Salaam.en_US
dc.identifier.urihttp://localhost:8080/xmlui/handle/123456789/1568
dc.language.isoenen_US
dc.publisherUniversity of Dar es Salaamen_US
dc.subjectMarine pollutionen_US
dc.subjectHeavy metalsen_US
dc.subjectCoastal zone managementen_US
dc.subjectMsimbazi Bayen_US
dc.subjectDar es Salaamen_US
dc.subjectTanzaniaen_US
dc.titleAssessment of heavy metals distribution in sediment and water, and their bioaccumulation in thumbprint emperor (lethrinus harak) in the msimbazi bay, Dar es salaamen_US
dc.typeThesisen_US

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