The co-ion and counter-ion sorption of monovalent (Na⁺, K⁺, Cl⁻ and NO^3-) and divalent ions (Ca²⁺ and SO₄^2-) in commercial Neosepta ion exchange membranes were systemically studied in both single and binary salt systems. The new generation of Neosepta cation exchange membrane (CSE) showed a significant difference in water uptake and co-ion sorption compared to the earlier generation CMX. Use of the Manning model confirmed that there were significant differences between these membranes, with the estimated value of the Manning parameter changing from 1.0 ± 0.1 for CMX to 2.8 ± 0.5 in CSE. There were fewer differences between the two Neosepta anion exchange membranes, AMX and ASE. In single salt solutions, potassium sorbed most strongly into the cation exchange membranes, but in binary salt mixtures, calcium dominated due to Donnan exclusion at low concentrations. While these trends were expected, the sorption behaviour in the anion exchange membranes was more complex. The water uptake of both AMX and ASE was shown to be the greatest in Na₂SO₄ solutions. This strong water uptake was reflected in strong sorption of sulphate ions in a single salt solution. Conversely, in a binary salt mixture with NaCl, sulphate sorption fell significantly at higher concentrations. This was possibly caused by ion pairing within the solution, as well as the strongly hydrophobic nature of styrene in the charged polymer. Water uptake was lowest in NaNO₃ solutions, even though sorption of the nitrate ion was comparable to that of chloride in these single salt solutions. In the binary mixture, nitrate was absorbed more strongly that chloride. These results could be due to the low surface charge density of this ion allowing it to bond more strongly with the hydrophobic polymeric backbone at the exclusion of water and other ions.

一价的共离子和反离子吸附（钠⁺，K ⁺，氯^-和NO ^3-）和二价离子（钙²⁺和SO ₄ ^2-）在商业化Neosepta离子交换膜中，系统地研究了单盐和二元盐系统。与前一代CMX相比，新一代Neosepta阳离子交换膜（CSE）在吸水率和共离子吸附方面表现出显着差异。使用曼宁模型证实了这些膜之间存在显着差异，曼宁参数的估计值从CMX的1.0±0.1变为CSE的2.8±0.5。两种Neosepta阴离子交换膜AMX和ASE之间的差异较小。在单盐溶液中，钾最强地吸收到阳离子交换膜中，但是在二元盐混合物中，由于低浓度的Donnan排斥，钙占主导地位。尽管预计会出现这些趋势，阴离子交换膜的吸附行为更为复杂。钠中AMX和ASE的吸水率最高₂ SO ₄解决方案。这种强大的吸水率反映在单一盐溶液中对硫酸根离子的强烈吸附。相反，在与NaCl形成的二元盐混合物中，较高的浓度下硫酸盐的吸附显着下降。这可能是由于溶液中的离子配对以及带电聚合物中苯乙烯的强疏水性引起的。即使在这些单盐溶液中硝酸根离子的吸附量与氯化物相当，在NaNO ₃溶液中吸水量最低。在二元混合物中，硝酸盐比氯化物吸收更强。这些结果可能是由于该离子的表面电荷密度低，使得它在排除水和其他离子时更牢固地与疏水性聚合物主链结合。