Taguchi S, Takahashi K, Hata N, Kasahara I
Department of Environmental Biology and Chemistry, Faculty of Science, Toyama University, Gofuku, Japan.
Analyst. 2001 Nov;126(11):2078-81. doi: 10.1039/b105459g.
Anionic surfactants containing sulfur in their structure were enriched on a mixed cellulose ester membrane filter (MF) by filtration as an ion-pair complex with a cationic surfactant. After their enrichment, the anionic surfactants were determined by X-ray fluorescence spectrometry of the sulfur enriched on the MF. A linear calibration was obtained over a concentration range from 0.05 to 0.8 mg L(-1) of sodium dodecyl sulfate as a standard material with less than 6% RSD. The detection limit based on 3s for the reagent blank was 2 microg L(-1). This method is very simple, rapid and highly selective for sulfur-containing surfactants, and does not require any organic solvent extraction. This method was applied to the determination of anionic surfactant in some urban river waters where domestic wastewater was discharged. The results were compared with those obtained by conventional solvent extraction-spectrophotometry. The distribution of the analyte complexes within the MF where the ion-pair was retained is also discussed.
结构中含硫的阴离子表面活性剂通过与阳离子表面活性剂形成离子对络合物，以过滤方式富集在混合纤维素酯膜过滤器（MF）上。富集后，通过对MF上富集的硫进行X射线荧光光谱法测定阴离子表面活性剂。以十二烷基硫酸钠为标准物质，在0.05至0.8 mg L⁻¹浓度范围内获得线性校准曲线，相对标准偏差小于6%。基于试剂空白3s的检测限为2 μg L⁻¹。该方法非常简单、快速，对含硫表面活性剂具有高度选择性，且无需任何有机溶剂萃取。该方法应用于一些排放生活污水的城市河水中阴离子表面活性剂的测定。将结果与传统溶剂萃取 - 分光光度法获得的结果进行了比较。还讨论了离子对保留在MF内的分析物络合物的分布情况。
