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Determination of association constants of inorganic ions with C-12- and C-14-alkyldimethylammoniopropane sulfonate zwitterionic surfactants using capillary electrochromatography

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posted on 2023-05-16, 12:56 authored by Yokoyama, T, Miroslav MackaMiroslav Macka, Paul HaddadPaul Haddad
Association constants (K ass) of 10 inorganic anions (chloride, bromide, iodide, nitrite, nitrate, chlorate, thiocyanate, iodate, perchlorate, and molybdate) and seven inorganic cations (lithium, sodium, potassium, rubidium, caesium, magnesium, and cerium(III)) with micelles of two zwitterionic surfactants 3-(N,N-dimethyldodecylammonio)propane sulfonate (C12N3S) and 3-(N,N-dimethylmyristylammonio)propane sulfonate (C14N3S) were determined using capillary electrochromatography (CEC). These K ass values of anions with C12N3S increased as follows: Cl - (4.2±0.1) < IO 3 - (4.6±0.1) < Br - (5.9±0.1) < NO 2 - (6.2±0.1) < MoO 4 2- (7.8±0.1) < NO 3 - (14±1) < ClO 3 - (26±1) < I - (68±7) < SCN - (310±30) < ClO 4 - (800±200) dm 3 mol -1. Similar K ass values were obtained for C14N3S micelles, but K ass values of these anions with a non-ionic surfactant and with a non-surfactant-type zwitterion (used for comparative purposes) were small. The K ass values of cations with the C12N3S micelle in 10 mM imidazole-20 mM 2-morpholinoethanesulfonic acid (MES) buffer of pH 6.2 increased as follows: Rb + (1.4±0.1) = Cs + (1.4±0.1) = K + (1.4±0.1) < Na + (3.2±0.1) < Li + (4.5±0.1) < Mg 2+ (7.8±0.1) < Ce 3+ (12±1) dm 3 mol -1. The fact that the K ass values for polarisable anions, such as iodide and thiocyanate, were larger than those of cations of +2 and +3 c harge, agrees well with the relative retentions for those ions in electrostatic ion chromatography (EIC). © 2001 Elsevier Science B.V. All rights reserved.

History

Publication title

Analytica Chimica Acta

Volume

442

Pagination

221-230

ISSN

0003-2670

Department/School

School of Natural Sciences

Publisher

Elsevier Science BV

Place of publication

Amsterdam

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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