Acid-induced cloud-point extraction coupled to spectrophotometry for the determination of carbaryl residues in waters and vegetables
Acid-induced cloud-point extraction coupled to spectrophotometry for the determination of carbaryl residues in waters and vegetables
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DOI：
10.1016/j.microc.2008.03.007
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发表时间：
2008-10-01
影响因子：
4.8
通讯作者：
Deming, Richard L.
中科院分区：
文献类型：
--
作者：
Santalad, Apichai;Srijaranai, Supalax;Deming, Richard L.
提出了一种基于2-萘胺-1-磺酸(ANSA)试剂衍生化的阴离子表面活性剂胶束萃取(酸诱导浊点萃取)测定西维因的简便、快速的光度分析方法。以十二烷基硫酸钠(十二烷基硫酸钠)和浓盐酸为萃取剂，常温下提取。ANSA的衍生化反应直接与西维因反应，无需碱解。考察了酸法提取和衍生化的最佳条件。该方法具有良好的分析性能，检出限低(50 mgg L~(-1))，线性范围达7.0 mg L(~(-1))，精密度好，相对标准偏差为2.3%(n=10)，样品加标回收率为85%。在所研究的本地蔬菜样品中，西维因污染的风险较高，含量为2.2g kg(-1)。该方法的测定结果与高效液相色谱测定的结果相当(t检验)。P=0.05)。(C)2008爱思唯尔B.V.保留所有权利。
A simple and rapid spectrophotometry for the determination of carbaryl based on acid-induced anionic surfactant micelle-mediated extraction (acid-induced cloud-point extraction) coupled to derivatization with 2-naphthylamine-1-sulfonic acid (ANSA) reagent has been demonstrated. Sodium dodecyl sulfate (SDS) and concentrated HCl were used as extractants at room temperature. ANSA derivatization was directly reacted with carbaryl without alkali hydrolysis. The optimum conditions for both acid-induced extraction and derivatization were investigated. The proposed method shows good analytical features with low detection limit (50 mu g L(-1)) as well as linearity covered a wide range up to 7.0 mg L(-1), good precision with the relative standard deviation of 2.3% (n = 10), and high recoveries in the samples (>85%). The high risks of carbaryl contamination in the local vegetable samples studied were observed with the level of 2.2 g kg(-1). The results of the proposed method were comparable to those obtained from HPLC (t-test. P=0.05). (C) 2008 Elsevier B.V. All rights reserved.