Concentration of chlorophenols in water to dialkyated catinonic surfactant-silica gel admicelles.
Concentration of chlorophenols in water to dialkyated catinonic surfactant-silica gel admicelles.
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DOI：
10.1016/j.chroma.2007.07.021
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发表时间：
2007-09
期刊：
影响因子：
--
通讯作者：
T. Saitoh;T. Kondo;M. Hiraide
中科院分区：
文献类型：
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作者：
T. Saitoh;T. Kondo;M. Hiraide
用双烷基阳离子表面活性剂-硅胶胶束萃取水中的氯酚类化合物，包括一氯酚、二氯酚、三氯酚、四氯酚和五氯酚。二烷基化阳离子表面活性剂如二癸基二甲基溴化铵（DC 10）和二十二烷基二甲基溴化铵（DC 12）在pH 9下吸附在硅胶表面上形成亚胶束。约200 mg DC 10定量吸附在1 g硅胶上。通过进一步添加DC 10，吸附进一步增加。这与单烷基化十六烷基三甲基氯化铵（CTAC）的最大吸附量仅为约100 mg/L的事实形成对比。100毫克。基于分子探针N-苯基-1-萘胺的荧光光谱，DC 10-和DC 12-硅胶吸附胶束比CTAC-硅胶吸附胶束具有更强的疏水性。DC 10-硅胶胶束对氯酚类化合物的萃取程度大于CTAC-硅胶胶束。然而，由于DC 12囊泡的泄漏，对DC 12-硅胶粘附胶束的萃取是不充分的。因此，DC 10-硅胶吸附胶束是最适合于浓缩水中的氯酚。通过使DC 10的水性缓冲溶液通过Bond Elut Jr.®硅胶固相萃取柱来制备胶束柱。该方法已成功地应用于水样中500倍浓度的氯酚类化合物，包括亲水性单取代氯酚的高效液相色谱分析。
Chlorophenols including monochlorophenol, dichlorophenol, trichlorophenol, tetrachlorophenol, and pentachlorophenol in water were extracted into dialkylated cationic surfactant–silica gel admicelles. The dialkylated cationic surfactants such as didecyldimethylammonium bromide (DC10) and didodedyldimethylammonium bromide (DC12) sorbed on silica gel surfaces to form admicelles at pH 9. Approximately 200mg of DC10 was quantitatively sorbed on 1g of silica gel. The sorption further increased by further addition of DC10. This is in contrast to the fact that the maximum sorption of mono-alkylated cetyltrimethyammonium chloride (CTAC) was only ca. 100mg. Based on the fluorescent spectra of a molecular probe, N-phenyl-1-naphthylamine, DC10- and DC12-silica gel admicelles were more hydrophobic than CTAC-silica gel admicelles. The extents of the extraction of chlorophenols into DC10-silica gel admicelles were greater than those into CTAC-silica gel admicelles. However, the extractions to DC12-silica gel admicelles were insufficient due to leakage of DC12 vesicles. Consequently, DC10-silica gel admicelles were the most adequate for concentrating chlorophenols in water. An admicelle column was prepared by passing aqueous buffer solution of DC10 through a Bond Elut Jr.®silica gel solid-phase extraction cartridge. It was successfully applied to the 500-fold concentration of chlorophenols including hydrophilic mono-substituted chlorophenol in water samples prior to their HPLC analysis.