| 聚乙烯毗咯烷酮修饰碳糊电极溶出伏安法测定水中硝基酚 |
| 摘要点击 890 全文点击 1086 投稿时间：1995-07-17 |
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| 中文关键词 聚乙烯吡咯烷酮 修饰碳糊电极 硝基酚 |
| 英文关键词 polyvinylpyrrolidone modified carbon paste electrode nitrophenols |
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| 中文摘要 |
| 提出用聚乙烯毗咯烷酮(PVPr)修饰碳糊电极同时测定水中对硝基酸和2,4-二硝基酚的方法。在0.1mol/LKCl的酚试液中开路富集,然后在磷酸盐缓冲液介质中溶出。以微分脉冲伏安法恻定,检测限分别为0.50μg/L和1.80μg/L.讨论了测定的影响因素以及2种硝基酚在该修饰电极上的反应机理。测定了地面水中对硝基酸和2,4-二硝基酸的含量,回收率分别为90±6%和86±5%。 |
| 英文摘要 |
| In this paper, a method to determine simultaneously p-ni-trophenol and 2,4-dinitrophenol in water by differential pulse voltammetry (DPV) with a carbon paste electrode modified with 10% (W/W) polyvinylpyrrolidone (PVPr) was described. The electrode showed a strong response to the nitrophenols, and the sensitivity and selectivity were much higher than ordinary carbon paste electrode. The nitrophenols were preconcentrated in 0.1 mg/L KCI solution during open circuit period, then the preconcentrated nitrophenols at the electrode were determined in phosphate buffer solution (pH7.0). The oxidation peak potentials were+0.88 V and+1.23 V (VS Ag-AgCl) respectively and two current peaks were completely separated. The detection limits were 0.50 ig/L (p-nitrophenol)and 1.80 ig/L (2,4-dinitrophenol). This method had been applied to the determination of nitrophenols in pol luted surface water,and the recoveries of p-nitrophenol and 2,4-dinitrophenol wer 90±6% and 86±5% respectively. |
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