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首页> 外文期刊>Food Chemistry >Salt-assisted liquid-liquid microextraction for the determination of iodine in table salt by high-performance liquid chromatography-diode array detection
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Salt-assisted liquid-liquid microextraction for the determination of iodine in table salt by high-performance liquid chromatography-diode array detection

机译：高效液相色谱-二极管阵列检测盐辅助液液微萃取测定食盐中的碘

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摘要

2-lodosobenzoate and N,N-dimethylaniline have been used at pH 6.4 for selective conversion of iodide to 4-iodo-N,N-dimethylaniline which was extracted with ethanol, when the phase separation occurred by addition of ammonium sulphate, a process called salt-assisted liquid-liquid microextraction (SALLME), and analysed by high-performance liquid chromatography-diode array detection. Iodate was reduced to iodide before derivatisation. The method has been optimised for extracting solvent, salt for phase separation, and reaction time. A linear calibration was obtained for 10 μg-10 mg L_(-1) of iodide with correlation coefficient of 0.9989 and limit of detection of 3.7 ug IT1. The SALLME produced 280-fold enrichment of the derivative. The commercial iodised table salt samples have been found highly inhomogeneous; the RSD in analysis of different aliquots of the same sample ranged 18.0-78.1%. The average recovery of spiked iodide to real samples was 98.4% with an average RSD of 7.9% (range 5.2-12.4%).
机译：当添加硫酸铵进行相分离时，已在pH 6.4下使用2-碘代苯甲酸酯和N，N-二甲基苯胺将碘化物选择性转化为4-碘-N，N-二甲基苯胺，然后用乙醇萃取该相。盐辅助液-液微萃取（SALLME），并通过高效液相色谱-二极管阵列检测进行分析。在衍生化之前，碘化物被还原为碘化物。该方法已优化用于萃取溶剂，盐以进行相分离和反应时间。对10μg-10mg L _（-1）的碘化物进行线性校准，相关系数为0.9989，检出限为3.7 ug IT1。 SALLME产生了280倍的衍生物富集。已发现市售碘食食盐样品高度不均匀。同一样品的不同等分试样的分析的RSD范围为18.0-78.1％。实际样品中加标碘化物的平均回收率为98.4％，平均RSD为7.9％（范围5.2-12.4％）。

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