Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia
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...
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Forestry Department Peninsular Malaysia
2019
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my.upm.eprints.822892020-10-16T20:39:04Z http://psasir.upm.edu.my/id/eprint/82289/ Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia Godon, Edrianna Mohamed, Khairul Nizam Yusoff, M. K. Surimin, A. Gani, M. A. Wahab, Z. A. 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. Forestry Department Peninsular Malaysia 2019 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/82289/1/Study%20of%20dissolved%20copper%20%28ii%29%20speciation%20at%20Pulau%20Pangkor%2C%20Perak%2C%20Peninsular%20Malaysia.pdf 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 |
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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. |
| format |
Article |
| author |
Godon, Edrianna Mohamed, Khairul Nizam Yusoff, M. K. Surimin, A. Gani, M. A. Wahab, Z. A. |
| spellingShingle |
Godon, Edrianna Mohamed, Khairul Nizam Yusoff, M. K. Surimin, A. Gani, M. A. Wahab, Z. A. Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia |
| author_facet |
Godon, Edrianna Mohamed, Khairul Nizam Yusoff, M. K. Surimin, A. Gani, M. A. Wahab, Z. A. |
| author_sort |
Godon, Edrianna |
| title |
Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia |
| title_short |
Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia |
| title_full |
Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia |
| title_fullStr |
Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia |
| title_full_unstemmed |
Study of dissolved copper (ii) speciation at Pulau Pangkor, Perak, Peninsular Malaysia |
| title_sort |
study of dissolved copper (ii) speciation at pulau pangkor, perak, peninsular malaysia |
| publisher |
Forestry Department Peninsular Malaysia |
| publishDate |
2019 |
| url |
http://psasir.upm.edu.my/id/eprint/82289/1/Study%20of%20dissolved%20copper%20%28ii%29%20speciation%20at%20Pulau%20Pangkor%2C%20Perak%2C%20Peninsular%20Malaysia.pdf http://psasir.upm.edu.my/id/eprint/82289/ |
| _version_ |
1681490852602445824 |
| score |
13.211869 |