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Magnesium-selective test strip
Authors:Capitán-Vallvey L F  Ramos M D Fernández  Gálvez P Alvarez de Cienfuegos  Gómez J
Affiliation:Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, Granada 18071, Spain
Abstract:A selective test strip based on an ion-exchange mechanism to determine magnesium is described. This optical and reversible test strip, made on a transparent polyester sheet, has a circular polymeric film of plasticised PVC that contains all of the reagents necessary to produce a response to magnesium, namely, a cation-selective neutral ionophore, 2-amino-N,N′-diheptyl-N,N′-dimethyl-butanediamide, a chromoionophore, N,N-diethyl-5-(octadecanoylimino)-5H-benzo[a]phenoxazine-9-amine, and potassium tetrakis (4-chlorophenyl)borate (TCPB) as a lipophilic salt, which is evaluated by absorbance measurement at 655 nm in a standard photometer. The experimental variables that influence test strip response, especially in terms of selectivity and response time, have been studied. The test strip responded linearly to magnesium between 0.009 and 160 mM in activities. The reproducibility intermembrane at a medium level of the range was 8.0%, as R.S.D., of logaMg2+, and 5.9% as R.S.D. intramembrane. The procedure was applied to the determination of magnesium in different types of waters (tap, well and mineral) validating the results against a reference procedure. This proposed method is quick, inexpensive, selective and sensitive and uses only conventional instrumentation.
Keywords:Magnesium determination   Test strip   Ionophore-chromoionophore system   Water analysis
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