Department of Chemistry, Faculty of Science, The University of Zanjan, 45371-38791 Zanjan, Iran; School of Chemistry, The University of Melbourne, Victoria 3010, Australia.
School of Chemistry, The University of Melbourne, Victoria 3010, Australia.
Talanta. 2018 May 1;181:385-391. doi: 10.1016/j.talanta.2018.01.042. Epub 2018 Feb 3.
A poly(vinylidene fluoride-co-hexafluoropropylene)-based polymer inclusion membrane (PIM) using Cyphos® IL 101 (i.e. trihexyl(tetradecyl)phosphonium chloride) as the carrier and 2-nitrophenyl octyl ether as a plasticizer in a mass ratio of 55/35/10 was employed for the on-line extractive separation of V(V) prior to its spectrophotometric determination in a flow injection analysis (FIA) system using xylenol orange as the colorimetric reagent. The selectivity of the membrane allowed the determination of V(V) in sulfate solutions in the presence of a variety of cations and anions. The interference of molybdenum(VI) was eliminated by off-line extraction using the same PIM. A univariate sequential optimization of the newly developed FIA system was conducted and under optimal conditions the system is characterized by a linear concentration range of 0.5-8.0mgL, detection limit of 0.08mgL and sample throughput of 4h. The relative standard deviation at the 3mgL level of V(V) was 2.9% based on 8 replicate determinations. The membrane was stable, which was reflected by the standard deviation value for determinations over three consecutive days (24 determinations of 3mgL V(V)) of 3.6%. The newly developed FIA system was applied to the determination of V(V) in water and dietary supplements samples and a good agreement with inductively coupled plasma optical emission spectrometry was observed.
采用聚（偏二氟乙烯-共-六氟丙烯）基聚合物整体膜（PIM），以 Cyphos® IL 101（即三己基（十四烷基）氯化磷）作为载体，2-硝基苯辛醚作为增塑剂，质量比为 55/35/10，用于在线萃取分离 V(V)，然后在流动注射分析（FIA）系统中使用二甲酚橙作为显色试剂进行分光光度测定。该膜的选择性允许在存在各种阳离子和阴离子的情况下，在硫酸盐溶液中测定 V(V)。通过使用相同的 PIM 进行离线萃取，可以消除钼(VI)的干扰。对新开发的 FIA 系统进行了单变量顺序优化，在最佳条件下，该系统的线性浓度范围为 0.5-8.0mg/L，检测限为 0.08mg/L，样品通量为 4h。在 V(V)的 3mg/L 水平下，相对标准偏差为 2.9%，基于 8 次重复测定。该膜具有良好的稳定性，在连续三天（3mg/L V(V)的 24 次测定）的测定中，标准偏差值为 3.6%。新开发的 FIA 系统已应用于水和膳食补充剂样品中 V(V)的测定，与电感耦合等离子体发射光谱法观察到良好的一致性。
