离子液体气浮溶剂浮选分光光度法测定水中痕量铝  

Study on the spectrophotometric determination of trace aluminum in water samples with ionic liquid solvent sublation

作　　者：马春宏[1,2] 朱红[1] 王良[1] 姜大雨[1] 闫永胜[2] 

机构地区：[1]吉林师范大学化学学院,吉林四平136000 [2]江苏大学化学化工学院,江苏镇江212013

出　　处：《冶金分析》2010年第6期69-72,共4页Metallurgical Analysis

基　　金：国家自然科学基金项目(20777029);吉林省教育厅基金项目(20090195)

摘　　要：研究了一种用离子液体代替有机溶剂作为气浮溶剂浮选分离、分析水中痕量铝(Ⅲ)的新方法。实验以离子液体1-丁基-3-甲基咪唑六氟磷酸盐([Bmim]PF6)和乙酸乙酯(EA)的混合物(V/V=1∶1)为浮选剂,以四环素(TC)为捕集剂浮选水样,在pH值为6.7、氮气流速为40mL/min、浮选时间为50min时络合物被浮选分离溶解于[Bmim]PF6-EA相,在380nm波长处用紫外分光光度计直接测定。实验结果表明:络合物在铝质量浓度为0.1～52.4μg/L范围内与吸光度A呈良好的线性关系,表观摩尔吸光系数为4.79×106L.mol-1.cm-1,检出限达0.02μg/L。实测了环境水样中铝(Ⅲ)的含量,加标回收率为91%～97%,RSD小于3.2%。In this paper, a new method for flotation separation and analysis of trace aluminum （Ⅲ） in water was established using ionic liquid to replace organic solvent as sublation solvent. With the mixture of ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphats and ethy1 acetate （[Bmim]PF6-EA） （V/V=1） as sublation solvent and tetracycline（TC） antibiotic as trapping agent, the TC-Al（Ⅲ） complex could be floated and transferred into [Bmim]PF6-EA phase under the following conditions： pH of 6.7, nitrogen flow rate of 40 mL/min and flotation time of 50 minutes. The system could be determined directly at 380 nm with ultraviolet spectrophotometer. The experimental results showed that absorbance was linear with the mass concentration of aluminum in the range of 0.1-52.4 μg/L. The apparent molar absorbance was 4.79×106 L·mol-1cm-1, and the detection limit was 0.02 μg/L. This method has been applied to determine aluminum （Ⅲ） in environmental water samples with recoveries of 91 %-97 % and RSD of less than 3.2 %.

关 键 词：离子液体 溶剂浮选 铝(Ⅲ) 分光光度法 

分 类 号：X832[环境科学与工程—环境工程]