SURFACE-ENHANCED RAMAN DETECTION OF AQUEOUS CYANIDE

被引:17
作者
SHELTON, RD [1 ]
HAAS, JW [1 ]
WACHTER, EA [1 ]
机构
[1] OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831
关键词
SERS; CYANIDE; ELECTROCHEMICAL; GROUNDWATER; PROCESS MONITORING;
D O I
10.1366/0003702944029677
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Cyanide ion (CN-) has been the subject of numerous studies probing the mechanisms underlying the surface-enhanced Raman scattering (SERS) phenomenon. This work examines various aspects critical to application of SERS for direct detection of trace cyanide in groundwater and in wastewater streams. A new method for direct quantitation of cyanide in aqueous electrolyte has been developed that uses an ex situ oxidation-reduction cycle to precondition a planar silver electrode. Cyanide ion can be detected in 0.1 M KCl with a linear response between 100 ppm and 10 ppb. The estimated limit of detection is approximately 8 ppb. The effects of pH, electrolyte level, and two common background ions, nitrate (NO3-) and sulfate (SO42-), have been characterized. Cyanide response was found to be sensitive to pH, with optimal performance observed at neutral to basic pH. Electrolyte concentrations of 0.001 M reduced response to cyanide by a factor of five, while levels above 0.1 M had no significant effect. The addition of 10-ppm sulfate ion decreased response approximately 40%, while the presence of nitrate ion at concentrations up to 100 ppm had a negligible effect on SERS response. These results suggest that cyanide ion can be detected directly in high-ionic-strength aqueous solutions, such as groundwater.
引用
收藏
页码:1007 / 1010
页数:4
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