Determination of diethylhexyladipate and acetyltributylcitrate in aqueous extracts after cloud point extraction coupled with microwave assisted back extraction and gas chromatographic separation.
Determination of diethylhexyladipate and acetyltributylcitrate in aqueous extracts after cloud point extraction coupled with microwave assisted back extraction and gas chromatographic separation.
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DOI：
10.1016/j.chroma.2005.07.075
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
P. Zygoura;E. Paleologos;K. Riganakos;M. Kontominas
中科院分区：
文献类型：
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作者：
P. Zygoura;E. Paleologos;K. Riganakos;M. Kontominas
介绍了工业增塑剂己二酸二（2-乙基己基）酯（DEHA）和乙酰柠檬酸三丁酯（ATBC）在水溶液中的测定方法。新提出的将微波应用于浊点提取物的技术，以便能够与气相色谱分析相结合，已被用于这一目的。这两种增塑剂被截留在非离子表面活性剂Triton X-114的胶束中，并通过离心从体相中除去。胶束化的增强，通过增加溶液的离子强度与浓NaCl。该方法对水和3%（w/v）乙酸水溶液的萃取回收率均在95%以上，对10%（v/v）乙醇水溶液的萃取回收率均在85%以上。根据拟定方法获得的校准曲线，每种分析物的线性范围为50 - 2000μg/L，而DEHA和ATBC的检测限分别低至15和19μg/L，即使在低浓度下，RSD也低于5%。作为一个分析论证，建议的方法被应用于从PVC食品包装膜到水性模拟物中的选定增塑剂的迁移水平的测定。
The determination of commercial plasticizers (di-(2-ethylhexyl)adipate (DEHA) and acetyl tributyl citrate (ATBC)) in aqueous solutions is described. The newly proposed technique of applying microwaves to cloud point extracts in order to enable combination with gas chromatographic analysis has been used for this purpose. Both plasticizers were entrapped in the micelles of the non-ionic surfactant Triton X-114 and removed from the bulk phase by centrifugation. Micellization was enhanced by increasing the ionic strength of the solution with concentrated NaCl. Extraction recoveries of the proposed method were over 95% for water and 3% (w/v) aqueous acetic acid and over 85% for 10% (v/v) aqueous ethanol, respectively. The calibration curves obtained, following the proposed methodology have a linear range between 50 and 2000μg/L for each analyte while the detection limits were as low as 15 and 19μg/L for DEHA and ATBC, respectively, with an RSD below 5% even for low concentrations. As an analytical demonstration the proposed methodology was applied for the determination of the migration levels of the selected plasticizers from a PVC food packaging film into aqueous simulants.