salts’ exchange center steric accessibility and presence of a neutral anion carrier, 4-(triﬂuoroacetyl)benzoic acid heptyl ester, upon analytical characteristics of ion-selective elec- trodes reversible to molybdate, tungstate, sulfate, hydrogen phosphate, sulﬁte, carbonate and thiosulfate anions, has been studied. When the most sterically hindered quaternary ammonium salts, trinonyl octadecyl ammonium bromide, is replaced by one of the salts with the accessible exchange center, the selectivity is altered, the magnitude of the selectivity coefﬁcient change being determined by the Keywords Ion-selective electrode Quaternary nature of the interfering ion. Thus, for carbonate- and ammonium salt Steric accessibility Neutral anion carrier sulfate-selective ISEs with hydrophobic thiocyanate ions as interference, the effect achieved is 6–8 orders of magni- tude, while with nitrate ions as interference it is 3.4–5.7 Introduction orders, and for such hydrophilic interference ions as sul- fate, chloride and oxalate, it is even less. Replacing tri- Sulﬁte, molybdate, tungstate, hydrogen phosphate, car- nonyl octadecyl ammonium bromide with a sterically bonate, thiosulfate and sulfate ions occur in natural and/or accessible ammonium salt improves lower detection limit waste waters. They are also used in laboratory practice as generally by 1–2 orders, while for sulﬁte and thiosulfate corresponding salts; in addition, sulﬁtes,
Chemical Papers – Springer Journals
Published: Oct 22, 2017
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