Effect of plasticizers on selectivity of chloride ion-selective polymeric membrane electrodes based on quaternary ammonium salts.

Anion-Selective Electrodes Based on Long-Chain Methyltrialkylammonium Salts

“…The chain length of the methyltrialkylammonium salt showed a characteristic effect on the selectivity, which is similar to that observed for tetraalkylammonium salts . Note that the selectivity pattern differs somewhat from the one reported earlier, because in this study the ISEs were conditioned with serum prior to use. For the lipophilic anions such as thiocyanate, perchlorate, and nitrate, the selectivity coefficient decreased (hence, the selectivity improved) as the chain length ( n ) was increased from 12 to 16, but then it increased slightly at n = 18.…”

“…An annealed polyion complex membrane prepared from a cation-exchange polymer and excessive quaternary ammonium , reportedly exhibited high Cl - selectivity at temperatures below the transition temperature. Certain plasticizers also appear to induce similar effects. , With a combination of higher aliphatic alcohol − and ligands of a tetraalkylammonium type, we have observed significant improvement in the Cl - selectivity over lipophilic anions and organic acid ions, especially when the alkyl chain length of the ligand was longer than 14. , However, the electrodes based on such long-chain tetraalkylammoniums generally show high impedance, so a high level of expertise is needed to exploit the potential of the ligands.…”

“…4,5 With a combination of higher aliphatic alcohol [9][10][11][12] and ligands of a tetraalkylammonium type, 5 we have observed significant improvement in the Clselectivity over lipophilic anions and organic acid ions, especially when the alkyl chain length of the ligand was longer than 14. 13,14 However, the electrodes based on such long-chain tetraalkylammoniums generally show high impedance, so a high level of expertise is needed to exploit the potential of the ligands.…”

“…One such compound was recently synthesized, 15 ligands used for ISEs. 14 This paper will focus on the development of a series of such long-chain methyltrialkylammonium compounds, their characteristics as Clligands, and their applicability to Cldetermination in blood serum samples.…”

“…Therefore, we presumed that the advantages of both the MTDDA and the higher selectivity of the long-chain tetraalkylammoniums could be attained by preserving the basic structure of methyltrialkylammonium salt and lengthening its three alkyl chains. One such compound was recently synthesized, and initial attempts have been made to apply such compounds to the ligands used for ISEs …”