Jakubowska Anna
Department of Physical Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60780 Poznan, Poland.
Chemphyschem. 2006 Nov 13;7(11):2312-8. doi: 10.1002/cphc.200600237.
Electrospray ionisation mass spectrometry (ESI-MS) is used for the qualitative and quantitative study of ion binding to interfaces. The ESI-MS measurements are carried out in aqueous solutions of sodium dodecyl sulphate (SDS) in the presence of NaCl, NH(4)ClO(4) , KCl, or Mg(ClO(4))(2) . The effect of the electrolyte concentration on the fractions, y(cation(+) ), of the DS(-) monomers bound to the cations is shown. Moreover, the binding stability of different cations with DS(-) monomers is determined versus the electrolyte concentration. This stability and the y(Na(+) ) values (the Na(+) ions derived from SDS), estimated in the presence of a given electrolyte, are quantitatively correlated with the electrolyte cation effect on the water structure. We also present calibration curves from which the molar concentrations of the sodium ions (derived from SDS) and of the other cations (derived from the electrolyte), bound to the SDS-micelle surface at a given electrolyte concentration, can be obtained. Besides, specific ion effects (Hofmeister effects) are considered for 1:1 electrolytes.
电喷雾电离质谱法（ESI-MS）用于离子与界面结合的定性和定量研究。ESI-MS测量在十二烷基硫酸钠（SDS）的水溶液中进行，溶液中存在氯化钠、高氯酸铵、氯化钾或高氯酸镁。展示了电解质浓度对与阳离子结合的DS(-)单体分数y(cation(+) )的影响。此外，确定了不同阳离子与DS(-)单体的结合稳定性与电解质浓度的关系。这种稳定性以及在给定电解质存在下估计的y(Na(+) )值（源自SDS的Na(+)离子）与电解质阳离子对水结构的影响定量相关。我们还给出了校准曲线，从中可以获得在给定电解质浓度下与SDS胶束表面结合的钠离子（源自SDS）和其他阳离子（源自电解质）的摩尔浓度。此外，还考虑了1:1电解质的特定离子效应（霍夫迈斯特效应）。
