Extraction System for the Spectrophotometric Determination of Tungsten(VI) with 4-Nitrocatechol and Benzalkonium Chloride.

IF 1.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Vidka Vassileva Divarova, Kirila Trifonova Stojnova, Ivelina Dobromirova Radkovska, Antoaneta Dimitrova Saravanska, Galya Kostadinova Toncheva, Vassil Borisov Delchev, Kiril Blazhev Gavazov
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引用次数: 0

Abstract

A novel chromogenic system for the liquid-liquid extraction and determination of trace amounts of tungsten(VI) was investigated. The system comprises 4-nitrocatechol (4NC) as a chromogenic reagent, sulfuric acid as a complexing medium, and benzalkonium chloride (BAC) as a source of bulky cations (BA+), which readily form chloroform-extractable ion-association complexes. The impact of foreign ions and reagents was studied, and the optimal conditions for the sensitive, selective, and inexpensive determination of tungsten(VI) were identified. The limit of detection, linear working range, and molar absorptivity at lmax (422 nm) were determined to be 31 ng cm-3, 0.1-4.4 µg cm-3, and 5.49 × 104 dm3 mol-1 cm-1, respectively. The composition of the extracted complex was 1:2:2 (W:4NC:BA). Two potential structures of its anionic component, [WO2(4NC)2]2-, were discussed based on optimizations at the B3LYP/CEP-4G theoretical level and comparison between theoretical and experimental spectra.

用 4-硝基邻苯二酚和苯扎氯铵分光光度法测定钨(VI)的萃取系统。
研究了一种用于液-液萃取和测定痕量钨(VI)的新型发色系统。该系统由 4-硝基邻苯二酚(4NC)作为发色试剂、硫酸作为络合介质、苯扎氯铵(BAC)作为大阳离子(BA+)来源组成。研究了外来离子和试剂的影响,确定了灵敏、选择性高且成本低廉的测定钨(VI)的最佳条件。测定的检出限、线性工作范围和 lmax(422 nm)处的摩尔吸收率分别为 31 ng cm-3、0.1-4.4 µg cm-3 和 5.49 × 104 dm3 mol-1 cm-1。提取复合物的成分为 1:2:2(W:4NC:BA)。根据 B3LYP/CEP-4G 理论水平的优化以及理论与实验光谱的比较,讨论了其阴离子成分 [WO2(4NC)2]2- 的两种潜在结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Chimica Slovenica
Acta Chimica Slovenica 化学-化学综合
CiteScore
2.50
自引率
25.00%
发文量
80
审稿时长
1.0 months
期刊介绍: Is an international, peer-reviewed and Open Access journal. It provides a forum for the publication of original scientific research in all fields of chemistry and closely related areas. Reviews, feature, scientific and technical articles, and short communications are welcome.
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