Potentiometric Determination of Trace Amounts of Mercury (II) in Water Sample Using a New Modified Palm Shell Activated Carbon Paste Electrode Based on Kryptofix 5 — Oak Academic Publishing
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Potentiometric Determination of Trace Amounts of Mercury (II) in Water Sample Using a New Modified Palm Shell Activated Carbon Paste Electrode Based on Kryptofix 5
Chemical Engineering Department, University of Malaya, Kuala Lumpur, Malaysia
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Chemical Engineering Department, University of Malaya, Kuala Lumpur, Malaysia
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Chemical Engineering Department, University of Malaya, Kuala Lumpur, Malaysia
1 Chemical Engineering Department, University of Malaya, Kuala Lumpur, Malaysia
2 Chemical Engineering Department, University of Malaya, Kuala Lumpur, Malaysia
3 Chemical Engineering Department, University of Malaya, Kuala Lumpur, Malaysia
A new modified palm shell activated carbon paste electrode based on 1,13-Bis(8-quinolyl)-1,4,7,10,13-pentaoxat-ride-cane ,8,8-(1,4,7,10,13-Pentaoxatridecylene)-diquinoline (Kryptofix ? 5) and plasticizing agent was prepared and studied as Hg2+ selective electrode. The best performance was observed with the electrode composition having the iono-phore-palm shell activated carbon-plasticizer composition 10%:50%:40% with Nernstian response over the concentration range of 1.0 × 10 –8 - 1.0 × 10 –2 M with a slope of 42 ± 1.5 mV per decade of concentration. The detection limit as determined from the calibration plot is 1.0 × 10 –7 M. The proposed electrode shows good selectivity for Hg(II) with interfering ions. The response time of the electrode is fast (≤10 s), and can be used in the pH range of 3 - 11. The electrode was used to determine mercury in drinking water.
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