PVC membrane ion selective electrode for the determination of pentachlorophenol in water, wood and soil using tetrazolium pentachlorophenolate.
PVC membrane ion selective electrode for the determination of pentachlorophenol in water, wood and soil using tetrazolium pentachlorophenolate.
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DOI：
10.1016/s0039-9140(01)00475-1
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发表时间：
2001-09
期刊：
影响因子：
6.1
通讯作者：
M. N. Abbas;G. Mostafa;A. Homoda
中科院分区：
文献类型：
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作者：
M. N. Abbas;G. Mostafa;A. Homoda
以2，3，5-三苯基-2H-四氮唑(TPT)离子对为电活性物质，研制了一种选择性测定五氯酚(PCP)的聚氯乙烯膜电极。该电极对五氯苯酚的浓度在6×10−5~1×10−2M范围内呈良好的线性关系，检测下限为4×10−5M，最低检测温度为25℃。电极的能斯腾斜率为−55.0±1 mV/十，快速电位响应值为45 S，在pH 5.5~10.5范围内几乎保持不变。一些常见离子的选择性系数数据可以忽略不计，而2，4，6-三氯苯酚和十六烷基吡啶离子则有干扰。对废水样品中75.0ppm的五氯酚进行测定，平均回收率为96.2%，相对标准偏差为2.3%。土壤和木材样品中五氯苯酚的测定结果与用气相色谱测定的结果相当。该电极已被用作终点指示电极，用于电位滴定测定五氯苯酚。
A novel PVC membrane electrode selective for the determination of pentachlorophenolate (PCP) ion based on 2,3,5-triphenyl-2H-tetrazolium (TPT) pentachlorophenolate ion pair as an electroactive material is described. The electrode shows a linear response for PCP ion over the concentration range of 6×10−5to 1×10−2M with lower detection limit of 4×10−5M at 25°C. The electrode posses a Nernstian slope of −55.0±1.0 mV/decade and a fast potential response of 45 s, which is almost constant over a pH range of 5.5–10.5. Selectivity coefficient data for some common ions show negligible interference, however, 2,4,6-trichlorophenolate and cetylpyridinium ions interfere. An average recovery of 96.2% with relative standard deviation of 2.3% has been achieved for the determination of 75.0 ppm PCP in wastewater samples. The determination of PCP in soil and wood samples gave results that compare favorably with those obtained by gas chromatography. The electrode has been utilized as an end point indicator electrode for the determination of PCP using potentiometric titration.