ELECTROCHEMICAL SERS DETECTION OF CHLORINATED HYDROCARBONS IN AQUEOUS-SOLUTIONS

被引:19
作者
STOREY, JME [1 ]
SHELTON, RD [1 ]
BARBER, TE [1 ]
WACHTER, EA [1 ]
机构
[1] OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831
关键词
SURFACE-ENHANCED RAMAN SPECTROSCOPY; SERS; ELECTROCHEMICAL SERS; COPPER ELECTRODE; IN SITU METHODS; TCE; CHLORINATED HYDROCARBONS;
D O I
10.1366/0003702944027417
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
An in situ method for the determination of trichloroethylene (TCE), perchloroethylene (PCE), chloroform (CHCl3), and carbon tetrachloride (CCl4) in aqueous solution is described. The method is based on ESERS-a combination of electrochemical methods and surface-enhanced Raman scattering (SERS). Electrochemistry prepares the surface of a copper electrode for SERS and concentrates the analyte on the surface. The formation of common reaction products for chloroalkanes and for chloroalkenes prevents unequivocal differentiation within a specific class of chlorinated hydrocarbons. However, spectroscopic selectivity between the chloroalkane and chloroalkene classes is excellent, while differences in electrochemical response provide a secondary means for differentiating analyte class. Sensitivity was found to be: <1 ppm for TCE; 15 ppm for PCE; 15 ppm for CHCl3; and 10 ppm for CCl4. Application of the method to groundwater contaminated with TCE has been demonstrated. In combination with a fiber-optic waveguide, the ESERS technique offers potential for remote detection of chlorinated hydrocarbons in groundwater and remediation process streams.
引用
收藏
页码:1265 / 1271
页数:7
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