环境水样中痕量氟的液膜富集与测定  

Enrichment with liquid emulsion membrane and determination of fluorine in water samples

作　　者：严进[1] 

机构地区：[1]南通职业大学化学与生物工程学院,江苏南通226007

出　　处：《化学试剂》2012年第8期726-728,732,共4页Chemical Reagents

摘　　要：用N235作流动载体,Span80作表面活性剂的乳化液膜富集环境水样中的氟,研究了载体和表面活性剂的用量、油内比、乳水比、外相初始pH等因素对氟回收率的影响。实验结果表明,当载体体积分数5%、表面活性剂体积分数3%、油内比1∶1、内相NH4Cl质量浓度3%、水样初始pH 8、乳水比1∶5时,氟的回收率可达99.5%以上。考察了20多种共存离子的影响,结果表明方法具有良好的选择性。运用该法富集、测定环境水样中的F-,相对标准偏差<3.4%,加标回收率为95.5%～103.3%。The enrichment of fluorine in water by liquid mem- brane prepared using N235 as flow carrier and Span80 as surfactant was explored. The effects of NH4Clconcentration in the internal phase, carrier dosage, surfactant dosage,the ratio of oil and water,the ratio of emulsion and water and initial pH value in the external phase on the recovery rate of fluorine were investigated. The experimental results showed that therecovery rate of fluorine reached above 99. 5% when the envi- ronmental water containing fluorine was enriched in the condi- tions that the carrier concentration （volume fraction,the same as the following） was 5% , the surfactant concentration was 3% ,the ratio of oil and water was 1： 1, NH4Cl concentration in the internal phase was 3% , the initial pH value of water was about 8 and the ratio of emulsion and water was 1 ： 5. The interferences of foreign ions were also studied. The method has been successfully applied to the determination of F- in water samples with the relative standard deviation of below 3.4% and the average recovery of 95.5% - 103.3%.

关 键 词：液膜法 富集 氟 分光光度法 

分 类 号：O657.31[理学—分析化学]