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Mercury has been the major electrode material employed in voltammetry. This is mainly due to its high overvoltage properties toward hydrogen, which enable it to determine heavy metals with negative reduction potensials. Mercury can form amalgam with most metals but can not amalgamate arsenic directl...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/8561 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Mercury has been the major electrode material employed in voltammetry. This is mainly due to its high overvoltage properties toward hydrogen, which enable it to determine heavy metals with negative reduction potensials. Mercury can form amalgam with most metals but can not amalgamate arsenic directly so the presence of copper(II) is needed. In previous researches, hanging mercury drop electrode has been used to determine arsenic concentration. The purpose of this research is to develop mercury film electrodes on a copper wire and to determine As(III) concentration using differential pulse stripping voltammetry. Relative standard deviation for repeated measurement of 30 ppb As(III) solution is 7,88%. The calibration plot for As(III) solution was linear over the range concentration of 10 ppb-100 ppb with detection limit of 8,67 ppb. The percent recovery are between 99,06%-101,77%. The performance of this electrode has been compared with mercury film electrode on carbon paste-silica. Relative standard deviation for repeated measurement of 47 ppb As(III) solution is 8,76%. The calibration plot for As(III) solution was linear over concentration range of 1 ppb-10 ppb with detection limit of 8,67 ppb. The percent recovery are between 93,42%-101,52%. The performance of mercury film electrode on carbon paste-silica is better to used for determination arsenic concentration. |
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