DETERMINATION OF BTEX COMPOUNDS IN WATER BY SOLID-PHASE MICROEXTRACTION AND RAMAN-SPECTROSCOPY

被引：92

作者：

WITTKAMP, BL ^{[1
]}

TILOTTA, DC ^{[1
]}

机构：

[1] UNIV N DAKOTA,DEPT CHEM,GRAND FORKS,ND 58202

来源：

ANALYTICAL CHEMISTRY | 1995年 / 67卷 / 03期

关键词：

D O I：

10.1021/ac00099a018

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new method is described for determining benzene, toluene, ethylbenzene, and xylenes (BTEX) in water that combines solid-phase microextraction and spontaneous Raman spectroscopy. In this method, the BTEX analytes are extracted from the water solution into a solid phase before direct detection by Raman spectroscopy. The solid phase consists of a small volume (ca. 55 mu L) of poly(dimethylsiloxane) which has optical windows in the 750-1300- and 1410-2800-cm(-1) Raman shift regions. The time required for each BTEX compound to reach equilibrium between the solid phase and the aqueous phase is in the range of 16-30 min and affords preconcentration enhancements of 2-3 orders of magnitude. Limits of detection using the most intense Raman bands are in the 1-4-ppm range and produce relative standard deviations of 3-9%. Preliminary application of this new method to the detection of BTEX compounds in real-world water samples shows no significant interferences from river and well water matrices.

引用

页码：600 / 605

页数：6

共 17 条

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