scholarly journals How selectivity affects the accuracy and precision of chloride ion-selective electrodes based on quaternary ammonium salts.

1994 ◽  
Vol 43 (3) ◽  
pp. 223-229 ◽  
Author(s):  
Yasuhisa SHIBATA ◽  
Naoto OKI ◽  
Satoshi OZAWA ◽  
Hiroyuki MIYAGI
Keyword(s):  
Quaternary Ammonium ◽  
Chloride Ion ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Ion Selective Electrodes ◽  
Accuracy And Precision

The influence of cation and anion structure of new quaternary ammonium salts on adsorption and leaching

Holzforschung ◽  
2005 ◽  
Vol 59 (2) ◽  
pp. 190-198 ◽  
Author(s):  
Jadwiga Zabielska-Matejuk
Keyword(s):  
Scots Pine ◽  
Quaternary Ammonium ◽  
Chemical Structure ◽  
Alkyl Chain ◽  
Chloride Ion ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Physical Processes ◽  
Water Leaching ◽  
Pine Wood

Abstract This study examined the effect of cation and anion chemical structure of new quaternary ammonium and imidazolium compounds (QAC, bis-QAC, IC, bis-IC) on the adsorption onto Scots pine wood (Pinus sylvestris L.) and resistance to water leaching. The group of copper (II) modified QACs, containing copper-chloro-acetate complexes in the anion structure, was also examined. The length of alkyl hydrophobic substituents in the cation structure significantly influences adsorption. The adsorption characteristics were statistically related to the alkyl chain length of new quaternary ammonium salts (quantitative correlations between CMC and adsorption values). Bis-ICs adsorb onto Scots pine wood with the greatest difficulty and the slowest and are also leached to the greatest degree. A varied adsorption of chloride ion cations and a several times higher leaching of chlorides than cations of the examined salts from the saturated wood were observed. The anion modification of bis-QAC and bis-IC of copper-chloro-acetate complexes causes decreased adsorption and resistance to the leaching of these salts. As a result of the performed regression analysis of Langmuir and Freundlich adsorption isotherms, it was found that the adsorption of the examined compounds onto wood was governed by both chemical and physical processes. New quaternary ammonium and imidazolium compounds represent potential wood preservatives.

scholarly journals EFFECT OF STERIC ACCESSIBILITY OF EXCHANGE CENTER OF HIGHER QUATERNARY AMMONIUM SALTS AND PLASTICIZER NATURE ON CHARACTERISTICS OF ELECTRODES, REVERSIBLE TO DOUBLE-CHARGED ANIONS

2018 ◽  
Vol 59 (1) ◽  
pp. 9
Author(s):  
E.M. Rakhman’ko ◽  
Yu.V. Matveiychuk
Keyword(s):  
Detection Limit ◽  
Quaternary Ammonium ◽  
Limit Of Detection ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Ion Selective Electrodes ◽  
Selectivity Coefficients ◽  
Low Detection Limit ◽  
Order Of Magnitude ◽  
Steric Accessibility

The effect of the steric accessibility of the exchange center of higher quaternary ammonium salts and plasticizer nature on the selectivity and the limit of detection for film electrodes reversible to hydrophilic double-charged anions was studied. It was established the decrease in selectivity coefficients lgKi,jPot by 2.8−3.8 order of magnitude and low detection limit by 2−3 order of magnitude in the series of QAS: TOD≤TC<TL<TNODA<TB<TE<TM< DCPBTM. Also, the increase in low detection limit by 1−0.7 order of magnitude in the series of plasticizers: DBP>DDP>o-NPDE>1-BN was established. The composition of membranes of ion-selective electrodes was optimized.

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

2019 ◽  
Vol 54 (4) ◽  
pp. 428-433
Author(s):  
Yu. V. Matveichuk
Keyword(s):  
Quaternary Ammonium ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Ion Selective Electrodes ◽  
Qualitative Explanation ◽  
Hydrogen Phosphate ◽  
Lower Detection Limit ◽  
Born Model ◽  
Lower Detection ◽  
Doubly Charged

It has been established that membranes of carbonate and hydrogen phosphate selective electrodes based on higher quaternary ammonium salts are preferable to be plasticized with o-nitrophenyldecyl ether, membranes of sulfate, selenate, selenite-selective electrodes with 1-bromonaphthalene, sulfite, molybdate, tungstate-selective electrodes with dibutylphthalate. The use of an optimum plasticizer allows, in general, reducing both the lower detection limit of electrodes and the values of selectivity coefficients by about 1 order (depending on the interfering ion). A qualitative explanation is given to the results obtained from the Fouoss theory and the Born model.

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