Abstract
A method for the determination of methamphetamine in urine using a methamphetamine-sensitive membrane electrode was developed. No pretreatment of urine samples was required, which enabled methamphetamine excreted in the urine of drug addicts to be assayed sensitively and selectively. The electrode was constructed by incorporating sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate as the ion exchanger and tricresyl phosphate as the membrane solvent in a poly(vinyl chloride) membrane matrix. The detection limit for methamphetamine in urine was 10 μM. The response characteristics were affected considerably by changing the membrane solvent and tricresyl phosphate was found to be the most suitable for the determination of methamphetamine in urine.
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