Laboratorio de Química Analítica y Ambiental, Instituto de Química, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2950, Valparaíso, Chile.
J Chromatogr A. 2012 Feb 3;1223:9-14. doi: 10.1016/j.chroma.2011.12.038. Epub 2011 Dec 16.
In the present work three different SPME fibers have been investigated for simultaneous determination of methyl-, butyl- and phenyltins by using gas chromatography-pulsed flame photometer detection (GC-PFPD). The optimal experimental conditions for each fiber were determined and the respective figures of merit were evaluated. All fiber evaluated presented similar limit of detection (sub ng L⁻¹) and requires two internal standards to reach an acceptable repeatability. However, the CAR-PDMS fiber offers the best compromise between selectivity and sensibility for determination of organotins selected. The developed method was validated for analysis of certified reference material and spiked samples, obtaining satisfactory results. Finally, some contaminated samples were analyzed demonstrating the applicability of developed method for determination of organotin compounds in the environment and for monitoring their biochemical cycle.
本工作研究了三种不同的 SPME 纤维，通过气相色谱-脉冲火焰光度检测（GC-PFPD）同时测定甲基、丁基和苯基锡。确定了每种纤维的最佳实验条件，并评价了各自的优点。所有评估的纤维都具有相似的检测限（亚 ng L⁻¹），并且需要使用两种内标才能达到可接受的重复性。然而，CAR-PDMS 纤维在所选有机锡的选择性和灵敏度之间提供了最佳折衷。所建立的方法已用于分析认证参考材料和加标样品，得到了令人满意的结果。最后，对一些污染样品进行了分析，证明了所建立的方法可用于测定环境中的有机锡化合物，并监测其生物化学循环。
