Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, Tehran, Iran.
J Sep Sci. 2010 Apr;33(8):1132-8. doi: 10.1002/jssc.200900553.
A micro-SPE technique was developed by fabricating a rather small package including a polypropylene membrane shield containing the appropriate sorbent. The package was used for the extraction of some triazine herbicides from aqueous samples. Solvent desorption was subsequently performed in a microvial and an aliquot of extractant was injected into GC-MS. Various sorbents including aniline-ortho-phenylene diamine copolymer, newly synthesized, polypyrrole, multiwall carbon nanotube, C18 and charcoal were examined as extracting media. Among them, conductive polymers exhibited better performance. Influential parameters including extraction and desorption time, desorption solvent and the ionic strength were optimized. The developed method proved to be rather convenient and offers sufficient sensitivity and good reproducibility. The detection limits of the method under optimized conditions were in the range of 0.01-0.04 ng/mL. The RSDs at a concentration level of 0.1 ng/mL were obtained between 4.5 and 9.3% (n=5). The calibration curves of analytes showed linearity in the range of 0.05-10 ng/mL. The developed method was successfully applied to the extraction of selected triazines from real water samples. The whole procedure showed to be conveniently applicable and quite easy to manipulate.
一种微固相萃取技术通过制作一个相当小的封装件得以发展，该封装件包括一个含有适当吸附剂的聚丙烯膜屏蔽。该封装件用于从水样中萃取一些三嗪类除草剂。随后在微管中进行溶剂解吸，并将萃取物的等分试样注入 GC-MS。各种吸附剂，包括新合成的苯胺-邻苯二胺共聚物、聚吡咯、多壁碳纳米管、C18 和活性炭，被用作萃取介质。其中，导电聚合物表现出更好的性能。对萃取和洗脱时间、洗脱溶剂和离子强度等影响参数进行了优化。开发的方法证明非常方便，具有足够的灵敏度和良好的重现性。在优化条件下，该方法的检测限在 0.01-0.04ng/mL 范围内。在 0.1ng/mL 浓度水平下，获得的 RSD 在 4.5-9.3%（n=5）之间。分析物的校准曲线在 0.05-10ng/mL 范围内呈线性。该方法成功地应用于从实际水样中萃取选定的三嗪类除草剂。整个过程显示出方便适用和易于操作的特点。
