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Organotin Compounds: An Ionophore System for Fluoride Ion Recognition

Organotin Compounds: An Ionophore System for Fluoride Ion Recognition

Sudeshna Chandra, Ales Růzicka, Petr Svec, Heinrich Lang

Anal Chim Acta. 2006 Sep 1;577(1):91-7.

PMID: 17723658

Abstract:

Ion-selective properties were established for membrane electrodes prepared by using organotin compounds of type (L(CN)RSnF2)n, (R=n-Bu (I),=Ph (II)) and (L(CN)SnF3)n (III) (L(CN)=C(6)H4(CH2NMe2)-2). Electrodes formulated with the optimized membranes containing the organotin compounds I-III as ionophores and sodium tetraphenylborate (10-30%) exhibited high selectivity for fluoride over other anions. An electrode prepared with ionophore II using dibutyl phthalate as the plasticizer and 15% sodium tetraphenylborate (NaTPB) as anion additive, possesses the best potentiometric response characteristics. It shows a detection limit of 7.9 x 10(-7) M with a slope of 62.7 mV decade(-1) of activity in buffer solutions of pH 5.5. The interference from other anions is suppressed under this optimized measurement conditions. An entirely non-Hofmeister selectivity sequence (F->CH3COO->Cl->I- approximately Br->ClO4->NO2->NO3->SCN-) with remarkable preference towards fluoride is obtained. The influence on the electrode performances by anion additive was studied, and the possible response mechanism was investigated by UV-vis spectra. The electrode has been used for direct determination of fluoride in drinking mineral water with satisfactory results.

Chemicals Related in the Paper:

Catalog Number	Product Name	CAS Number	Price
AP25777439	Phthalate Ionophore I	25777-43-9	Price
AP61595775	Sodium ionophore II	61595-77-5	Price
AP767355179	Fluoride ionophore I	767355-17-9	Price

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