Study on the phytoremediation of arsenic (as) contaminated soils in Geita

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dc.contributor.authorSangu, George
dc.date.accessioned2019-10-26T14:31:20Z
dc.date.accessioned2020-01-07T15:46:43Z
dc.date.available2019-10-26T14:31:20Z
dc.date.available2020-01-07T15:46:43Z
dc.date.issued2014
dc.descriptionAvailable in print form, East Africana Collection, Dr. Wilbert Chagula Library, Class mark (THS EAF QK753.H4T34S26)en_US
dc.description.abstractThe study on phytoremediation of arsenic contaminated soils was carried out in Geita low land areas that receive effluents from gold mining. Screening of plant species with ability to accumulate arsenic using systematic random sampling revealed that Chloris pycnothrix is a potential arsenic hyperaccumulator. The species was found to accumulate 42.4 mg/kg in frond tissues with negligible amounts of arsenic in roots under field conditions .Laboratory testing of the species against hyperaccumulator criteria, C. pycnothrix qualified for high plant biomass, easy germination, rapid growth and translocation factor above one. This study found that amending the soils with organic matter, pH and mycorrhizae improved C. pycnothrix biomass increased the species tolerance to arsenic toxicity, improved arsenic uptake by the species and translocation of arsenic from the root tissues to the frond tissues. Single factor analysis of variance at P < 0.05 showed that there were significant differences in biomass, arsenic uptake and translocation when amended with organic matter > 5 %, amended to pH > 8 and mycorrhizae amended at all levels of arsenic subjected to the plant.These findings suggest that C. pycnothrix is a potential hyperaccumulator and that amending contaminated soils with organic matter, pH and mycorrhizaae can improve hyperaccumulation. The other species i.e. Cyperus papyrus, Paspalum auriculata, Oryza sativa, Ageratum conyzoides, Cynodon dactylon and Miscanthus vioolecium were classified as arsenic excluders although they can be explored for hyperaccumulation of other metals than arsenic.en_US
dc.identifier.citationSangu, G. (2014) Study on the phytoremediation of arsenic (as) contaminated soils in Geita, Doctoral dissertation, University of Dar es Salaam, Dar es Salaamen_US
dc.identifier.urihttp://localhost:8080/xmlui/handle/123456789/1932
dc.language.isoenen_US
dc.publisherUniversity of Dar es Salaamen_US
dc.subjectPlantsen_US
dc.subjectEffects of herbicides onen_US
dc.subjectArsenicen_US
dc.subjectSoilen_US
dc.subjectGeitaen_US
dc.subjectTanzaniaen_US
dc.titleStudy on the phytoremediation of arsenic (as) contaminated soils in Geitaen_US
dc.typeThesisen_US

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