Hassan S S, Hamada M A
Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt.
Analyst. 1990 May;115(5):623-5. doi: 10.1039/an9901500623.
The potentiometric response characteristics of a poly(vinyl chloride) membrane electrode for heroin based on its ion-pair complex with tetraphenylborate were examined. The influence of pH, temperature and time on the performance of the electrode system was investigated. The electrode shows a near-Nernstian response over the heroin concentration range 10(-2)-10(-4) M with good precision. The mean relative standard deviation for the determination of heroin in 40 micrograms ml-1(-1) mg ml-1 aqueous heroin hydrochloride solutions is 1.2%. The electrode exhibits good selectivity for heroin in the presence of a number of adulterants and basic organic compounds commonly present in illicit heroin powders. The method was applied to the direct potentiometric determination of heroin in illicit powders (10-36% heroin) and the results agreed fairly well with those obtained by gas - liquid chromatography.
研究了基于海洛因与四苯硼酸盐的离子对配合物的聚氯乙烯膜电极的电位响应特性。考察了pH、温度和时间对电极系统性能的影响。该电极在10(-2)-10(-4) M的海洛因浓度范围内呈现近能斯特响应，精密度良好。在40微克/毫升-1(-1)毫克/毫升的盐酸海洛因水溶液中测定海洛因的平均相对标准偏差为1.2%。在存在多种非法海洛因粉末中常见的掺假物和碱性有机化合物的情况下，该电极对海洛因具有良好的选择性。该方法应用于非法粉末（10%-36%海洛因）中海洛因的直接电位测定，结果与气相-液相色谱法获得的结果相当吻合。
