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A deep eutectic solvent-based extraction method for fast determination of Hg in marine fish samples by cold vapor atomic absorption spectrometry
Analytical Methods ( IF 2.7 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1039/c7ay01372h Farzaneh Rastegarifard 1, 2, 3, 4, 5 , Kamal Ghanemi 1, 2, 3, 4, 5 , Mehdi Fallah-Mehrjardi 1, 2, 3, 4, 5
Analytical Methods ( IF 2.7 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1039/c7ay01372h Farzaneh Rastegarifard 1, 2, 3, 4, 5 , Kamal Ghanemi 1, 2, 3, 4, 5 , Mehdi Fallah-Mehrjardi 1, 2, 3, 4, 5
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An efficient sample extraction method for determination of total Hg in fish samples was developed. The method is based on the complete dissolution of samples in a deep eutectic solvent (DES). Among the DESs considered, choline chloride–oxalic acid was the best, dissolving samples completely without additional microwave or pressure processing. After adding 7 mol L−1 HNO3 or higher, the sample was digested very quickly (∼5 s), and a residue-free and clear solution was obtained. Since there was no need for further steps such as centrifugation and filtration, the risk of the elemental contamination was greatly reduced. The Hg content of each sample was determined by cold vapor atomic absorption spectrometry. Under optimized conditions, the Hg extraction efficiencies of the spiked samples were in the range 94.5–97.0%. The precisions based on relative standard deviations for five successive replications spiked at 1.0 and 5.0 μg g−1 were 2.0% and 5.5%, respectively. The limit of detection of the method was 0.03 μg g−1 (n = 8). Under optimized conditions, an excellent agreement between the obtained results and the certified values was observed. For comparison, different fish tissues (muscle and liver) were analyzed by both the proposed method and a conventional acid digestion method. Besides the high recoveries, our method was more rapid, energy saving, and environmentally friendly.
中文翻译：
一种基于深共熔溶剂的萃取方法，用于冷鱼原子吸收光谱法快速测定海水鱼类样品中的汞
建立了一种有效的样品提取方法，用于测定鱼样品中的总汞。该方法基于样品在深共熔溶剂（DES）中的完全溶解。在所考虑的DES中，氯化胆碱-草酸是最好的，无需额外的微波或压力处理即可完全溶解样品。加入7 mol L -1 HNO 3后大于或等于5秒钟，样品将被快速消化（约5 s），并获得无残留的澄清溶液。由于不需要进一步的步骤，例如离心和过滤，因此大大降低了元素污染的风险。通过冷蒸气原子吸收光谱法测定每个样品的汞含量。在最佳条件下，加标样品的汞提取效率在94.5–97.0％的范围内。基于以1.0和5.0μgg -1加标的五个连续重复样品的基于相对标准偏差的精密度分别为2.0％和5.5％。该方法的检出限为0.03μgg -1（n= 8）。在优化的条件下，观察到所得结果与认证值之间的极佳一致性。为了进行比较，通过提议的方法和常规的酸消化方法对不同的鱼类组织（肌肉和肝脏）进行了分析。除了高回收率外，我们的方法还更加快速，节能和环保。
更新日期：2017-09-26
中文翻译：
一种基于深共熔溶剂的萃取方法，用于冷鱼原子吸收光谱法快速测定海水鱼类样品中的汞
建立了一种有效的样品提取方法，用于测定鱼样品中的总汞。该方法基于样品在深共熔溶剂（DES）中的完全溶解。在所考虑的DES中，氯化胆碱-草酸是最好的，无需额外的微波或压力处理即可完全溶解样品。加入7 mol L -1 HNO 3后大于或等于5秒钟，样品将被快速消化（约5 s），并获得无残留的澄清溶液。由于不需要进一步的步骤，例如离心和过滤，因此大大降低了元素污染的风险。通过冷蒸气原子吸收光谱法测定每个样品的汞含量。在最佳条件下，加标样品的汞提取效率在94.5–97.0％的范围内。基于以1.0和5.0μgg -1加标的五个连续重复样品的基于相对标准偏差的精密度分别为2.0％和5.5％。该方法的检出限为0.03μgg -1（n= 8）。在优化的条件下，观察到所得结果与认证值之间的极佳一致性。为了进行比较，通过提议的方法和常规的酸消化方法对不同的鱼类组织（肌肉和肝脏）进行了分析。除了高回收率外，我们的方法还更加快速，节能和环保。
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