Issue 5, 1990

Poly(vinyl chloride) matrix membrane electrode for the selective determination of heroin (diamorphine) in illicit powders

Abstract

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 10–2–10–4M with good precision. The mean relative standard deviation for the determination of heroin in 40 µg 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.

Article information

Article type
Paper

Analyst, 1990,115, 623-625

Poly(vinyl chloride) matrix membrane electrode for the selective determination of heroin (diamorphine) in illicit powders

S. S. M. Hassan and M. A. Hamada, Analyst, 1990, 115, 623 DOI: 10.1039/AN9901500623

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