Effect of pH and particle size on the solubility of copper and zinc in river sediments

Jong, Hui Lan (2008) Effect of pH and particle size on the solubility of copper and zinc in river sediments. Universiti Malaysia Sabah. (Unpublished)

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Abstract

This study was conducted to detennine the effect of pH and particle size on the solubility of copper (Cu) and zinc (Zn) in river sediments. The sediment samples were collected from Bambangan River and Mentaki River in Ranau and divided into three fractions according to particle size: X ≤ 0.25 mm, 0.5 ≤ X ≤0.25 mm and 1.0≤X ≤ 0.5 mm. Each fraction was extracted using aqueous solutions with pH ranging from 2.0 to 6.0, and also digested in concentrated nitric acid. The concentrations of Cu and Zn extracts and digests were analyzed using atomic adsorption spectrophotometer (AAS). The results showed that the solubility of Cu was the highest compared to that of Zn, which was 34.45 μg/g obtained at pH 2 and particle size of ≤0.25 mm. The solubility of Cu and Zn increased as the pH and particle size decreased. The amount of soluble Cu and Zn were very low compared to the total concentration. The observed solubility of Cu and Zn in the sediment were under saturated with respect to the solid phases of CuO, Cu(OH)₂ and CuC0₃ and ZnO, Zn(OH)₂ and ZnC0₃

Item Type: Academic Exercise
Uncontrolled Keywords: copper, zinc, river sediment, particle size, pH, aqueous solution, nitric acid
Subjects: T Technology > TP Chemical technology
Divisions: SCHOOL > School of Science and Technology
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 13 Mar 2014 07:03
Last Modified: 12 Oct 2017 06:14
URI: http://eprints.ums.edu.my/id/eprint/8470

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