利用离子液体-分散液体-液体微萃取和石墨炉原子吸收光谱法测定水样中的痕量钴

IF 0.5 4区 化学 Q4 CHEMISTRY, ANALYTICAL
Yaqi Liu, Quan Han, Yanyan Huo, Xiaohui Yang
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引用次数: 0

摘要

建立了离子液体-分散液-液微萃取(IL-DLLME)和石墨炉原子吸收光谱(GFAAS)测定超痕量钴的新方法。以自制试剂2-(5-溴-2-吡啶偶氮)-5-二甲基氨基苯胺(5-Br-PADMA)为螯合剂,离子液体1-己基-3-甲基咪唑六氟磷酸盐([C6mim][PF6])为萃取剂,乙腈(CH3CN)为分散剂,采用离子液体分散液相微萃取法(IL-DLLME)萃取痕量钴,然后用石墨炉原子吸收光谱(GFAAS)进行测定。采用单向旋转法探讨了影响钴萃取效率的因素:萃取溶剂和分散溶剂的种类和体积、螯合剂的浓度和用量以及溶液的 pH 值。在优化条件下,钴浓度在0.05-1.50 ng/mL范围内呈良好的线性关系,检出限为0.026 ng/mL;测定质量浓度为1.0 ng/mL的钴标准溶液时,相对标准偏差(RSD)为4.83%(n = 9)。从萃取后与萃取前测定钴的线性回归方程的斜率可知,该方法的富集因子为 62,加标回收率为 94.0-104.4%。该方法具有检出限低、灵敏度高、环境友好、操作方便快捷等特点,适用于水样中痕量钴的测定。该方法的结果令人满意。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Determination of Trace Cobalt in Water Samples by Ionic Liquid-Dispersive Liquid–Liquid Microextraction and Graphite Furnace Atomic Absorption Spectrometry

Determination of Trace Cobalt in Water Samples by Ionic Liquid-Dispersive Liquid–Liquid Microextraction and Graphite Furnace Atomic Absorption Spectrometry

A new method for the determination of ultra-trace cobalt by ionic liquid-dispersive liquid-liquid microextraction (IL-DLLME) and graphite furnace atomic absorption spectrometry (GFAAS) was developed. The trace cobalt was extracted by DLLME using the homemade reagent 2-(5-bromo-2-pyridylazo)-5-dimethylaminobenzenamine (5-Br-PADMA) as chelating agent, the ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate ([C6mim][PF6]) as extractant, and acetonitrile (CH3CN) as dispersing agent, and then determined by GFAAS. The factors affecting the cobalt extraction efficiency: the type and volume of extraction solvent and dispersive solvent, the concentration and dosage of chelating agent, and the pH of the solution, were explored using the one-way rotation method. Under the optimized conditions, the cobalt concentration showed excellent linearity in the range of 0.05–1.50 ng/mL with the detection limit of 0.026 ng/mL; the relative standard deviation (RSD) for the determination of the cobalt standard solution with the mass concentration of 1.0 ng/mL was 4.83% (n = 9). From the slope of the linear regression equation for the determination of cobalt obtained after extraction compared with that before extraction, the enrichment factor of the method was found to be 62, and the spiked recoveries were in the range of 94.0–104.4%. The method is characterized by low detection limit, high sensitivity, and environment friendliness as well as convenient and rapid operation for the determination of trace cobalt in water samples. The results of this method are satisfactory.

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来源期刊
Journal of Water Chemistry and Technology
Journal of Water Chemistry and Technology CHEMISTRY, APPLIED-CHEMISTRY, ANALYTICAL
自引率
0.00%
发文量
51
审稿时长
>12 weeks
期刊介绍: Journal of Water Chemistry and Technology focuses on water and wastewater treatment, water pollution monitoring, water purification, and similar topics. The journal publishes original scientific theoretical and experimental articles in the following sections: new developments in the science of water; theoretical principles of water treatment and technology; physical chemistry of water treatment processes; analytical water chemistry; analysis of natural and waste waters; water treatment technology and demineralization of water; biological methods of water treatment; and also solicited critical reviews summarizing the latest findings. The journal welcomes manuscripts from all countries in the English or Ukrainian language. All manuscripts are peer-reviewed.
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