摘要
本文提出了浊点萃取-流动注射电感耦合等离子体原子发射光谱(FI-ICP-AES)法同时测定水中镉、钴、铜、镍、锌的新方法。利用5-Br-PADAP将待测金属离子转化为水不溶性的螯合物,并萃取到表面活性剂Triton X-114的浓缩相,以乙醇-硝酸溶液稀释含富集离子的浓缩相,并以FI-ICP-AES法测定。考察了流动注射进样体积、积分时间、萃取体系介质酸度、螯合剂和表面活性剂用量等实验条件的影响。在折衷条件下,镉、钴、铜、镍和锌的浓缩倍率可达18、10、16、10和8,检出限分别为0.7μg/L、1.6μg/L、1.3μg/L、5.7μg/L、3.2μg/L。方法成功应用于自来水、河水和海水中痕量镉、钴、铜、镍和锌的分析。在0.02 mg/L和0.10 mg/L二个水平进行加入回收试验,回收率在80%与118%之间。
A cloud point extraction procedure was developed for pre-concentration of trace amount of Cd^2＋ , Co^2＋ ,Cu^2＋ , Ni^2＋ and Zn^2＋ in water samples prior to inductively coupled plasma atomic emission spectrometric determination. 5-Br-PADAP was used to transform the metal ions into water in-soluble chelates, and the chelates were extracted into a surfactant-rich phase of Triton X-114. After being diluted with ethanol-nitric acid solution, the surfactant rich phase containing the concentrated metal ions was introduced into the ICP with flow injection technique. Various experimental conditions such as sampling volume, integration time, extraction acidity and concentrations of 5-Br-PADAP and Triton X- 114 were examined. Under the optimized conditions, enhancement factors of 18, 10, 16, 10, 8 and detection limits of 0. 7, 1. 6, 1. 3, 5. 7, and 3. 2 g/L were obtained for Cd^2＋, Co^2＋,Cu^2＋, Ni^2＋ and Zn^2＋ , respectively. The developed method was successfully applied to the determination of Cd^2＋ , Co^2＋ , Cu^2＋ , Ni^2＋ and Zn2＋ in tap water, river water and sea water samples. Recoveries for the spiked samples were in the range of 80% and 118%.
出处
《分析科学学报》
CAS
CSCD
北大核心
2009年第3期262-266,共5页
Journal of Analytical Science
基金
浙江省分析测试基金(No.04045)
关键词
浊点萃取
流动注射
电感耦合等离子体原子发射光谱法
Cloud point extraction
Flow injection
Inductively coupled plasma atomic emission spec trometry
