涡旋辅助液-液微萃取及间接分光光度法测定六价铬

Vortex-assisted liquid-liquid microextraction and indirect spectrophotometric determination of chromium(vi).

作者信息

Bazel Yaroslav, Riabukhina Tetiana

机构信息

Department of Analytical Chemistry, Uzhhorod National University Uzhhorod UA-88000 Ukraine

Department of Analytical Chemistry, University of P.J. Šafárik Košice SK-04154 Slovak Republic.

出版信息

RSC Adv. 2018 Oct 15;8(62):35360-35366. doi: 10.1039/c8ra07514j.

A novel, simple, sensitive and selective method for the indirect spectrophotometric determination of chromium(vi) was developed on the basis of vortex-assisted liquid-liquid microextraction (VALLME) of an ion association pair formed between the triiodide anion (I ) and cationic dye Astrazone Brilliant Red 4G (ABR). The indirect spectrophotometric determination of chromium(vi) was based on the redox-reaction of Cr(vi) with iodide and formed I . The triiodide anion was determined spectrophotometrically at 530 nm following VALLME of an ion association pair with ABR. The calibration plot was linear in the range 0.050-4.2 μg L ( = 0.998), and limit of detection (LOD) was 0.015 μg L for Cr(vi). The suggested procedure was successfully applied for the determination Cr(vi) in water samples (RSD 3.3-5.7%, recovery 97.7-102.8% when determining ultratrace levels Cr(vi) at 0.55-5.77 μg L), the accuracy of the method was assessed through a comparison with reference methods and certified reference materials.

基于三碘阴离子（I₃⁻）与阳离子染料阿斯特拉宗亮红4G（ABR）形成的离子缔合对的涡旋辅助液液微萃取（VALLME），开发了一种新颖、简单、灵敏且具选择性的间接分光光度法测定六价铬。六价铬的间接分光光度法测定基于Cr(Ⅵ)与碘化物的氧化还原反应生成I₃⁻。在与ABR形成离子缔合对进行VALLME后，于530 nm处通过分光光度法测定三碘阴离子。校准曲线在0.050 - 4.2 μg L范围内呈线性（r = 0.998），六价铬的检测限（LOD）为0.015 μg L。所建议的方法成功应用于水样中六价铬的测定（相对标准偏差3.3 - 5.7%，在0.55 - 5.77 μg L测定超痕量六价铬时回收率为97.7 - 102.8%），通过与参考方法和有证标准物质比较评估了该方法的准确性。