Sediment-Water Exchange of Selected Heavy Metals at the Backwaters of Makupa Creek, Kenya.
In situ benthic studies using incubation chambers were conducted at the backwaters of Makupa Creek (a peripheral creek located next to a municipal dumpsite) to directly measure fluxes of dissolved Mn, Fe, Ni. Cd, CLI and Pb. Physicochemical variations of the water overlying the chambers were also monitored and sediment cores were collected to measure their pH and Eh profiles. The sediment pH decreased markedly just below the water column at about the 0-2 cm segment, the decrease attributed to oxidation of organic matter and other inorganic chemical species. Organic matter oxidation contributed to the mobilization of heavy metals, demonstrating the significant effect of atmospheric oxidation on heavy metals dynamics at the Makupa creek backwaters during low tide. Humic and flu vic acid mobilization did not have a significant effect in the mobilization of Fe (Pearson correlation coefficient Fe-pH r =-0.34). However, Cu, Ni, Mn and Pb were to some extent mobilized due to solubalization of humic and fluvic acids at high pH. Ni and Cu were mobilized the most (Ni-pH r =0.40 and Cu-pH r =0.42). with both benthic chambers producing a pH peak at the 6th hour, which corresponded with a peak in dissolved Cu and Ni. Directly measured benthic fluxes ranged from +1680 to +8000 p moles cm-2 h-1 for Fe, - 599 to +370 p moles cm2 h- 1 for Mn, -1.1 to -0.0045 p moles cm2 h-1 for Cd, -33 to +1.2 P moles cm-2 h- 1 for Pb, +174 to +432 p moles cm2 h-1 for Cu and +74 to +361 p moles cm-2 h1 for Ni.
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Format: | Journal Contribution biblioteca |
Language: | English |
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2005
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Subjects: | Heavy metals, Benthic flux, Pollution, |
Online Access: | http://hdl.handle.net/1834/8316 |
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dig-aquadocs-1834-83162021-05-19T06:15:17Z Sediment-Water Exchange of Selected Heavy Metals at the Backwaters of Makupa Creek, Kenya. Kamau, J.N. Dehairs, F. Marteen, L. Kazungu, J. Heavy metals Benthic flux Pollution In situ benthic studies using incubation chambers were conducted at the backwaters of Makupa Creek (a peripheral creek located next to a municipal dumpsite) to directly measure fluxes of dissolved Mn, Fe, Ni. Cd, CLI and Pb. Physicochemical variations of the water overlying the chambers were also monitored and sediment cores were collected to measure their pH and Eh profiles. The sediment pH decreased markedly just below the water column at about the 0-2 cm segment, the decrease attributed to oxidation of organic matter and other inorganic chemical species. Organic matter oxidation contributed to the mobilization of heavy metals, demonstrating the significant effect of atmospheric oxidation on heavy metals dynamics at the Makupa creek backwaters during low tide. Humic and flu vic acid mobilization did not have a significant effect in the mobilization of Fe (Pearson correlation coefficient Fe-pH r =-0.34). However, Cu, Ni, Mn and Pb were to some extent mobilized due to solubalization of humic and fluvic acids at high pH. Ni and Cu were mobilized the most (Ni-pH r =0.40 and Cu-pH r =0.42). with both benthic chambers producing a pH peak at the 6th hour, which corresponded with a peak in dissolved Cu and Ni. Directly measured benthic fluxes ranged from +1680 to +8000 p moles cm-2 h-1 for Fe, - 599 to +370 p moles cm2 h- 1 for Mn, -1.1 to -0.0045 p moles cm2 h-1 for Cd, -33 to +1.2 P moles cm-2 h- 1 for Pb, +174 to +432 p moles cm2 h-1 for Cu and +74 to +361 p moles cm-2 h1 for Ni. Published 2016-01-27T14:59:15Z 2016-01-27T14:59:15Z 2005 Journal Contribution Not Known 0856-860X 0856-860X http://hdl.handle.net/1834/8316 en pp.153-162 Kenya, Coast, Mombasa, Makupa Creek |
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Heavy metals Benthic flux Pollution Heavy metals Benthic flux Pollution |
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Heavy metals Benthic flux Pollution Heavy metals Benthic flux Pollution Kamau, J.N. Dehairs, F. Marteen, L. Kazungu, J. Sediment-Water Exchange of Selected Heavy Metals at the Backwaters of Makupa Creek, Kenya. |
description |
In situ benthic studies using incubation chambers were conducted at the backwaters
of Makupa Creek (a peripheral creek located next to a municipal dumpsite) to directly measure
fluxes of dissolved Mn, Fe, Ni. Cd, CLI and Pb. Physicochemical variations of the water overlying
the chambers were also monitored and sediment cores were collected to measure their pH and
Eh profiles.
The sediment pH decreased markedly just below the water column at about the 0-2 cm
segment, the decrease attributed to oxidation of organic matter and other inorganic chemical
species. Organic matter oxidation contributed to the mobilization of heavy metals, demonstrating
the significant effect of atmospheric oxidation on heavy metals dynamics at the Makupa creek
backwaters during low tide. Humic and flu vic acid mobilization did not have a significant
effect in the mobilization of Fe (Pearson correlation coefficient Fe-pH r =-0.34). However,
Cu, Ni, Mn and Pb were to some extent mobilized due to solubalization of humic and fluvic
acids at high pH. Ni and Cu were mobilized the most (Ni-pH r =0.40 and Cu-pH r =0.42).
with both benthic chambers producing a pH peak at the 6th hour, which corresponded with a
peak in dissolved Cu and Ni.
Directly measured benthic fluxes ranged from +1680 to +8000 p moles cm-2 h-1 for Fe,
- 599 to +370 p moles cm2 h- 1 for Mn, -1.1 to -0.0045 p moles cm2 h-1 for Cd, -33 to +1.2
P moles cm-2 h- 1 for Pb, +174 to +432 p moles cm2 h-1 for Cu and +74 to +361 p moles cm-2 h1
for Ni. |
format |
Journal Contribution |
topic_facet |
Heavy metals Benthic flux Pollution |
author |
Kamau, J.N. Dehairs, F. Marteen, L. Kazungu, J. |
author_facet |
Kamau, J.N. Dehairs, F. Marteen, L. Kazungu, J. |
author_sort |
Kamau, J.N. |
title |
Sediment-Water Exchange of Selected Heavy Metals at the Backwaters of Makupa Creek, Kenya. |
title_short |
Sediment-Water Exchange of Selected Heavy Metals at the Backwaters of Makupa Creek, Kenya. |
title_full |
Sediment-Water Exchange of Selected Heavy Metals at the Backwaters of Makupa Creek, Kenya. |
title_fullStr |
Sediment-Water Exchange of Selected Heavy Metals at the Backwaters of Makupa Creek, Kenya. |
title_full_unstemmed |
Sediment-Water Exchange of Selected Heavy Metals at the Backwaters of Makupa Creek, Kenya. |
title_sort |
sediment-water exchange of selected heavy metals at the backwaters of makupa creek, kenya. |
publishDate |
2005 |
url |
http://hdl.handle.net/1834/8316 |
work_keys_str_mv |
AT kamaujn sedimentwaterexchangeofselectedheavymetalsatthebackwatersofmakupacreekkenya AT dehairsf sedimentwaterexchangeofselectedheavymetalsatthebackwatersofmakupacreekkenya AT marteenl sedimentwaterexchangeofselectedheavymetalsatthebackwatersofmakupacreekkenya AT kazunguj sedimentwaterexchangeofselectedheavymetalsatthebackwatersofmakupacreekkenya |
_version_ |
1756075031396352000 |