Higher quaternary ammonium salts with the sterically accessible exchange center: application for development of Selenate selective electrodes

Abstract

A new film selenate selective electrode has been developed, with the following membrane composition: (3,4,5-tris-dodecyloxybenzyl)tetraoxyethyl trimethyl ammonium chloride (5% w/w) as an electroactive component, (poly)vinyl chlorid (33% w/w) as a membrane matrix, 1-bromonaphtalene (42% w/w) as a plasticizer, (4-trifluoroacetyl) benzoic acid heptyl ester (20% w/w) as a neutral anion carrier. The electrode characteristics are as follows: linear range -2•10 -6 -10 -2 М by Na 2 SeO 4 ; line plot slope 26,0±0,3 mV/decade; lower detection limit 1•10 -6 М by Na 2 SeO 4 ; working рН range 2,15 -6,3; potential drift 0,9 mV/h; response time 15 -90 s; selectivity in presence of chloride, bromide, sulfate and other ions; lifetime up to 3 weeks. The electrode developed has been tested on model solutions using the standard addition method in the calibration plot variant, and bracketing technique.

Influence of plasticizer nature on the analytical characteristics of ion-selective electrodes based on higher quaternary ammonium salts reversible to doubly charged inorganic anions

“…Карбонат-, сульфат-, селенат-, селенит-, сульфит-, гидрофосфат-, молибдат-, тиосульфатселективные электроды изготовлены на основе хлоридов 3,4,5-трис-додецилоксибензил(оксиэтил) n триметиламмония (n = 2-4), вольфрамат-селективный электрод -на основе бромида 4(3,4-дицетоксифенил)бутилтриметиламмония. Выбор оптимального ионообменника осуществлен в предыдущих работах [18][19][20].…”