The use of purified dinonylnaphthalene sulfonic acid (DNNS) as extractant in polymer inclusion membranes (PIMs) was investigated for the first time. DNNS is commonly supplied in 50 wt% water soluble diluent, which when applied in PIMs is expected to affect their stability. Purified and commercial DNNS were characterised by gas chromatography with flame ionization detection and thermogravimetric analysis coupled with Fourier transform infrared spectrometric detection. PIMs prepared with the purified DNNS reagent containing the same amount of membrane liquid phase as the commercial DNNS-based PIMs were able to accommodate more DNNS than the PIMs incorporating the commercial product which contained a significant percentage of diluent. This resulted in better extraction efficiency and slightly lower mass loss. The affinity of a PIM containing 35 wt% purified DNNS, 10 wt% 1-tetradecanol and 55 wt% poly(vinyl chloride) towards a range of monovalent and divalent cations in 0.001 M HCl solutions, based on the percentage extracted metal ion, was found to follow the order: Fe³⁺ (1:1, 93.9) > Ca²⁺ (2:1, 63.4) > Pb²⁺ (2:1, 59.7) > Zn²⁺ (2:1, 48.5) > Cu²⁺ (2:1, 45.0) > Ni²⁺ (2:1, 40.6) > Mg²⁺ (2:1, 35.0) > Na⁺ (1:1, 20.9) ≈ K⁺ (1:1, 20.1), where the numerical data in the brackets correspond to the stoichiometric ratio (DNNS: ion) and the percentage of metal ion extracted from the source solution, respectively. This order can be explained by the Hard and Soft Acids and Bases Theory and the hydration energy of the metal cations. The stoichiometric composition of the corresponding metal – DNNS adducts was determined in solvent extraction experiments.

首次研究了纯化的二壬基萘磺酸（DNNS）作为聚合物包合膜（PIM）中的萃取剂的用途。DNNS通常以50 wt％的水溶性稀释剂提供，当应用于PIM中时，预计会影响其稳定性。纯化和商业化的DNNS通过气相色谱-火焰离子化检测和热重分析-傅里叶变换红外光谱检测相结合进行表征。用纯化的DNNS试剂制备的PIM与包含DNNS的PIM相比，能够容纳更多的DNNS，而DNNS试剂的膜液相量与基于DNNS的PIM相同。这导致更好的提取效率和稍低的质量损失。³⁺（1：1，93.9）> Ca ²⁺（2：1，63.4）> Pb ²⁺（2：1，59.7）> Zn ²⁺（2：1，48.5）> Cu ²⁺（2：1 ，45.0）> Ni ²⁺（2：1，40.6）> Mg ²⁺（2：1，35.0）> Na ⁺（1：1，20.9）≈K ⁺（1：1，20.1），其中数值数据括号中的分别对应于化学计量比（DNNS：离子）和从源溶液中提取的金属离子的百分比。该顺序可以通过硬酸和软酸和碱理论以及金属阳离子的水合能来解释。在溶剂萃取实验中确定了相应的金属– DNNS加合物的化学计量组成。