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Quenching Curves for VOCs in the Analysis of Groundwater $^{14}C$ using Liquid Scintillation Counter  

Lee, Kil-Yong (Groundwater and Geothermal Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Cho, Soo-Young (Groundwater and Geothermal Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Yoon, Yoon-Yeol (Groundwater and Geothermal Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Ko, Kyung-Seok (Groundwater and Geothermal Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Kim, Yong-Je (Groundwater and Geothermal Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Journal of Soil and Groundwater Environment / v.12, no.6, 2007 , pp. 53-59 More about this Journal
Abstract
Optimal quenching curves have been studied for the accurate analysis of $^{14}C$ in groundwater polluted by reducing efficiency of volatile organic compounds (VOCs) in liquid scintillation counter (LSC). The quenching parameters (SQP(E)) were measured for ten VOCs such as benzene, toluene, ethylbenzene, o-(m-,p-)xylene, trichloroethylene (TCE), tetrachloroethylene(PCE), carbon tetrachloride and chloroform. The quenching curves were plotted using $^{14}C$ standard solution and chloroform as a quenching agent. Optimal plotting conditions were determined for standard solution, LSC measuring time and the concentration of chloroform. The quenching effects of chlorinated organic compounds such as TCE, PCE, carbon tetrachloride and chloroform were greater than those of BTEX (benzene, toluene, ethylbenzene and xylene). Optimum measuring time was 100 minutes far 7,000 dpm/mL standard solution. A few mL of chloroform should be added for good quenching curves. These quenching curves have good correlation coefficients (> 0.99) and the curves could be applied to accurate analysis of $^{14}C$ in groundwater and tap water.
Keywords
Quenching Curve; $^{14}C$; VOC; Groundwater; LSC;
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