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首页> 外文期刊>RSC Advances >Optimization of an analytical method for the spectrophotometric determination of copper in tea and water samples after ultrasonic assisted cloud point extraction using a benzothiazole fluorescein derivative complexing agent
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Optimization of an analytical method for the spectrophotometric determination of copper in tea and water samples after ultrasonic assisted cloud point extraction using a benzothiazole fluorescein derivative complexing agent

机译：超声波辅助浊点萃取后超声波辅助荧光素衍生素衍生络合剂在超声波辅助浊点萃取后分光光度法测定分析方法的优化

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摘要

In this work, 2 ',7 '-di(2-benzothiazolyp-fluorescein (BTF) was synthesized by using 2-(2 ',4 '-dihydroxyphenypbenzothiazole (BT) and phthalic anhydride. BTF is colorful and its absorption maximum occurs at 559 nm. Interestingly, the introduction of Cu2+ affords a dramatic decrease of the absorbance at 559 nm, which is due to the spirolactonization of BTF induced by Cu2t. BTF shows high selectivity toward Cu2+ over other common metal ions in real samples, such as K+, Mg2+, Ca2+, Nat, Fe3+, Cd2+, Al3+, Co2+, Cr3+, Mn2+, Ni2+ La3+ and Zn2+. On this basis, a cloud point extraction (CPE) was developed for copper determination by a UV-vis method. The BTF-Cu2+ complex was explored for pre-concentration, and dissolved in a micellar phase composed by octylphenoxypolyethoxyethanol (Triton X-114). Under optimal experimental conditions, the decrease of the absorbance value (AA) at 559 nm is linear with Cu2+ concentration in the range from 0.03 to 2 jimol L-1 (1.90-127 mu g L-1) with a limit of detection of 7.48 nmol L-1 (3 sigma). The method has been successfully applied for the determination of copper in tea and water samples.
机译：在这项工作中，通过使用2-（2'，4'-Dihydroxyphenypbenzole（BT）和邻苯二甲酸酐合成2'，7'-DII（2-苯并噻唑苏脲（BTF）合成。BTF是色彩鲜艳的，其吸收最大值发生有趣的是，Cu2 +的引入提供了559nm的吸光度的显着降低，这是由于Cu 2T诱导的BTF的螺旋渗透。BTF在真实样品中的其他常见金属离子上显示出高选择性，例如K + ，Mg2 +，Ca2 +，NAT，Fe3 +，CD2 +，Al3 +，CO2 +，Cr3 +，Mn2 +，Ni2 + La3 +和Zn2 +。在此基础上，开发了一种通过UV-VIS方法进行铜测定的云点提取（CPE）。BTF-用于预浓缩的Cu 2 +复合物，并溶解在由辛基苯氧己基甲氧基乙醇组成的胶束阶段（Triton X-114）。在最佳实验条件下，559nm处的吸光度值（AA）的降低是线性的，在该范围内具有Cu2 +浓度的线性从0.03到2 jimol l-1（1.90-127 mu g l-1），限制de 7.48 nmol L-1（3 sigma）的根部。该方法已成功应用于茶叶和水样中的铜。

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  • 来源
    《RSC Advances》 |2015年第80期|共7页
  • 作者

    Fan Chunlei; Luo Shengxu; Liu Rong;

  • 作者单位

    NW Univ Xian Coll Chem &

    Mat Sci Minist Educ Key Lab Synthet &

    Nat Funct Mol Chem Xian 710069 Peoples R China;

    Hainan Univ Coll Mat &

    Chem Natl Minist Educ Trop Resources Utilizat Key Study Ctr Haikou 570228 Peoples R China;

    NW Univ Xian Coll Chem &

    Mat Sci Minist Educ Key Lab Synthet &

    Nat Funct Mol Chem Xian 710069 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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