UPSI Digital Repository (UDRep)
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UPSI Digital Repository (UDRep)
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| Abstract : Universiti Pendidikan Sultan Idris |
| This study describes the preparation of chemically modified multi-walled carbon nanotube paste electrode with zinc/aluminium layered double hydroxide-3(4- hydroxyphenyl)propionate nanocomposite (Zn/Al-LDH-HPP) for determination of Hg(II) by cyclic voltammetry method. Experimental parameters influencing the voltammetric response including percentage of modifier, type of supporting electrolyte, pH and scan rate were examined and optimized. The results show that optimum conditions of the voltammetric response were obtained at 2.5% (w/w) of Zn/Al-LDH-HPP, 0.5 M potassium chloride, pH 5.0 and scan rate of 100 mV s-1. A linear range was obtained within the concentration of 1.0 x 10-9 to 1.0 x 10-7M Hg(II) and 1.0 x 10-7 to 1.0 x 10-3 M Hg(II) with the limit of detection 5.0 x 10-10 M Hg(II). The presence of 25-folds concentration of most metal ions did not interfere the anodic peak current except Zn(II). In conclusion, the proposed modified multi-walled carbon nanotube paste electrode showed a high sensitivity, good selectivity, repeatability and reproducibility, making it suitable for the determination of Hg(II) in marine animal samples, for instance, fish and shellfish. |
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