砷的乳状液膜分离与分光光度测定研究

Study on separation with emulsion liquid membrane and spectrophotometric determination of arsenic

研究了表面活性剂，液体石蜡，内相反萃剂、油内比和料液中盐酸、ＫＩ浓度等条件对分离、富集砷的影响，确定了兰１１３Ａ－液体石蜡－煤油－ＮａＯＨ液膜体系的最佳组成和其它最适实验条件．分离后的砷用ＤＤＴＣ－Ａｇ法测定，多种常见共存离子不影响砷的分离和测定；对实际样品用标准加入法测定，回收率９７．６％，相对标准偏差为１５‰．

The effects of some factors such as surfactant,liquid paraffin,desorbing agent and the concentrations of HCl and KI in the feed solution on the separation and enrichment of arsenic were studied.The optimum constituents of liquid membrane L113A-liquid paraffin-kerosene-NaOH and the optimal conditions of enrichment were obtained. The enriched solutions were determined by spectrophotometry with DDTC- Ag.The system had been applied to water samples with a recovery of 97.6% and relative standard deviation of 15‰.