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Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia


Citation

Godon, Edrianna and Mohamed, Khairul Nizam and Yusoff, M. K. and Surimin, A. and Gani, M. A. and Wahab, Z. A. (2019) Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia. Malaysian Forester, 82 (1). pp. 27-36. ISSN 0302-2935

Abstract

The profile of seawater samples was analyzed from a few selected stations at Pulau Pangkor, Perak for dissolved copper speciation analysis in order to determine the concentration level of toxic cupric ions (Cu ²⁺ ) in seawater. The concentration of natural organic Cu(II)-ligand binding (CuL) and its conditional stability constant (Log K’CuL) in each sample was determined by using competitive ligand exchange–adsorptive cathodic stripping voltammetry (CLE-AdCSV) method with salicylaldoxime (SA) as competitive ligand. Our present data have recorded a total dissolved Cu concentration [dCu] ranged between 3.14–7.12 nM and 3.10–9.11 nM at a surface layer and at 15-meter depth, respectively. An organic ligand concentration [CuL] at the surface layer ranges between 4.41-13.25 nM, with its conditional stability constants (log K'CuL) between 11.55-12.17. However, at 15-meter depth, the [CuL] was recorded between 5.90-11.14 nM with log K'CuL ranged 10.93-12.84. On the other hands, a free Cu ion activity, pCu (pCu = −log[Cu ²⁺ ]), was ranged from 8.97-10.35, and was slightly less compared to the pCu values that have been recorded in other coastal waters (>12). The free [Cu ²⁺ ] was ranged between 10 ⁻⁹ –10 ⁻¹¹ pM, which was slightly below the toxicity threshold (10 ⁻⁸ pM). This initial study has suggested that dCu was largely complexed by organic ligands (>99.6%), both strong organic ligand (L1: LogK>12) at surface and weak organic ligand (L2: LogK<11) at the deeper layer. The presence of these two classes of ligands have buffering the free Cu ²⁺ ions, yielding a non-toxic Cu to the microorganisms.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Environmental Studies
Publisher: Forestry Department Peninsular Malaysia
Keywords: Total dissolved copper; Organic ligands; Cupric ions; Cu speciation; Conditional stability constants; Coastal water
Depositing User: Mr. Sazali Mohamad
Date Deposited: 16 Oct 2020 20:39
Last Modified: 16 Oct 2020 20:39
URI: http://psasir.upm.edu.my/id/eprint/82289
Statistic Details: View Download Statistic

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