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Title:	Speciation and spatial variation of heavy metals in Laut Jemberau, Tasik Chini, Malaysia
Authors:	Nimisha Krishnankutty (P80133)
Supervisor:	Mushrifah Idris, Prof. Dato' Dr.
Keywords:	Heavy metals -- Malaysia
Issue Date:	7-Aug-2018
Description:	Mining is the major contributor of heavy metal pollution in Tasik Chini, Malaysia. Deforestation of the protected zone of reserve forest exacerbates the problem. The current study is to understand the speciation of heavy metals spatially in soil, water and sediment to analyze the risk associated in terms of mobility and bioavailability. The sample of soil samples are collected from Bukit Ketaya, water and sediment samples from Sungai Jemberau, Laut Jemberau and Laut Gumum of Tasik Chini. Four samplings are conducted for a year, by collecting the top 20 centimeters of soil, sediment and water. Sequential extraction method was followed for speciation of soil and sediment and classified it into -exchangeable, -reducible, Fe-Mn oxides, -organic and -residual fractions. The results were also analyzed using Principal Component Analysis (PCA) and Cluster Analysis (CA). The result reveals that Fe, Al, Mn, Zn and Pb are the primary constituents of both soil and sediment contributing to about 98% of residual fraction. Co, Cd, Cr, As and Ni are found in trace metal concentration and are identified to be mainly released from anthropogenic sources nearby. Although the individual proportion is less than major metals in exchangeable and carbonate fraction, they possess geochemically significant concentration above permissible limit. More than 70-80% of all its total concentration proportion is hence found in mobile and bioavailable state. These possess toxic and have chronic effects to aquatic life and public health even in trace elemental concentration. Hence, these metals are the most toxic and bioavailable metals pausing risk for aquatic and public health. The risk assessment code (RAC) results also identifies that the risk associated with As, Co, Cd, Pb, and Ni pauses higher risk in the closer vicinity of mining site, especially in dry season. PCA analysis highlights that the enrichment of heavy metals in bioavailable fraction is mostly contributed from anthropogenic sources. The same results are emphasized by cluster analysis.,“Certification of Master's/Doctoral Thesis” is not available,Master of Science
Pages:	141
Call Number:	TD196.M4K735 2018 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Science and Technology / Fakulti Sains dan Teknologi

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