Adsorptive Stripping Voltammetric Determination of Phenol at an Electrochemically Pretreated Carbon-Paste Electrode with Solid Paraffin as a Binder
✍ Scribed by Huaisheng Wang; Aimei Zhang; Hui Cui; Daojie Liu; Renmin Liu
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 83 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0026-265X
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✦ Synopsis
An adsorptive stripping voltammetric method for determination of phenol at an electrochemically pretreated carbon-paste electrode has been developed. Solid paraffin was used as the binder of the carbon-paste electrode. The carbon-paste electrode was pretreated in the solution of 0.001 mol L Ϫ1 NaOH by holding it at ϩ1.8 V (versus an Ag/AgCl electrode) for 5 min. On the pretreated electrode, the adsorption of phenol was greatly enhanced. Phenol was accumulated in NH 3 -NH 4 Cl (pH 9.25) medium at the potential of ϩ0.1 V (versus Ag/AgCl electrode) for a certain time and then determined by second order differential anodic stripping voltammetry. An oxidative peak was observed at about ϩ0.66 V. The relationship between second order peak current and phenol concentration was linear in the range of 2.5 ϫ 10 Ϫ7 -5.0 ϫ 10 Ϫ6 mol L Ϫ1 phenol, and the detection limit was 5.0 ϫ 10 Ϫ8 mol L Ϫ1 . The method has been applied to the determination of phenol in tap water and waste water. The relative standard deviation (six determinations) was less than 3.5%.