功能化温控离子液体萃取-火焰原子吸收光谱法测定痕量镉  

FAAS Determination of Trace Amount of Cadmium with Functional Temperature-Control-Ionic Liquid Extraction

作　　者：张雪梅[1] 陈飞[1] 崔书亚[1] 何志坚[1] 杜军良[1] 

机构地区：[1]绵阳师范学院化学与化学工程学院,绵阳621000

出　　处：《理化检验（化学分册）》2015年第11期1501-1504,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：绵阳师范学院校级科研基金自然科学项目(2014A12)

摘　　要：采用功能化温控离子液体萃取-火焰原子吸收光谱法测定痕量镉。优化的试验条件如下：1离子液体的用量为0.25g;2溶液的pH为5.81;3离心时间30 min;4反萃取剂为2mol·L-1盐酸溶液5.00 mL;5超声时间为30 min;6反萃取3次。镉的质量浓度在1.20mg·L-1以内与其吸光度呈线性关系,检出限（3s/k）为0.027mg·L-1。方法应用于模拟水样的分析,测定值与参考值相符。加标回收率在102%~110%之间,测定值的相对标准偏差（n=3）均小于1.0%。FAAS was applied to the determination of trace amount of cadmium with functional temperaturecontrol-ionic liquid extraction.The optimized conditions found were as follows：1 amount of ionic liquid：0.25g;2 pH of the solution：5.81;3time of centrifugation：30min;4amount of 2mol·L-1 hydrochloric acid solution（back-extractant）：5.00 mL;5 time of ultrasonic extraction：30 min;6 times of back-extraction：3.Linear relationship between values of absorbance and mass concentration of cadmium was obtained in the range within1.20mg·L-1,with detection limit（3s/k）of 0.027mg·L-1.The proposed method was applied to the analysis of simulated water sample,giving results in consistency with the known value.Values of recovery found by standard addition method were in the range of 102%-110%,and values of RSD′s（n=3）less than 1.0%.

关 键 词：火焰原子吸收光谱法 温控离子液体萃取 镉 

分 类 号：O657.31[理学—分析化学]