As a result, correlation and calibration equations were established in which good reproducibility of the international standards was achieved with the value of first standard deviation less than ‰ as well as the accuracy and precision of the measurements were obtained with errors less than ‰. Based on these equations, 15 samples of groundwater collected from Cu Chi (Viet Nam) district were analyzed and calculated. | Journal of Science and Technology 54 (4B) (2016) 48-55 UTILIZATION OF ANALYTICAL TECHNIQUE FOR EVALUATION OF δ13CDIC IN GROUNDWATER USING EA-IRMS UNDER THE CONDITION OF VIETNAMESE LAB Thinh Thi Hong Nguyen1, Minh Hoang Tran2, Tuan Dinh Phan3, Hung Cam Ly3, * 1 Institute for Nuclear Science & Technology, 179 Hoang Quoc Viet street, Cau Giay district, Hanoi, Vietnam 2 Binh Duong Department of Natural Resources and Environment, 7th Floor, Tower B, Intergrated Political Administration Center of Binh Duong, Hoa Phu ward, Thu Dau Mot City, Binh Duong Province, Vietnam 3 Hochiminh City University of Natural Resources and Environment, 236B Le Van Sy, Ho Chi Minh City, Vietnam * Email: lchung@ Received: 15th August 2016; Accepted for publication: 10th November 2016 ABSTRACT As the demand of extraction and consumption of groundwater increases, its quality has been facing the issue of water contamination caused by industrial as well as domestic activities. Isotopic ratio analysis is a modern and effective technique widely used to trace the source of groundwater contamination. In this study, an analytical technique for carbon stable isotopic ratio of dissolved inorganic carbon in groundwater using elemental analyzer - isotopic ratio mass spectrometer was utilized under the condition in Vietnamese lab. As a result, correlation and calibration equations were established in which good reproducibility of the international standards was achieved with the value of first standard deviation less than ‰ as well as the accuracy and precision of the measurements were obtained with errors less than ‰. Based on these equations, 15 samples of groundwater collected from Cu Chi (Viet Nam) district were analyzed and calculated. Keywords: isotopic ratio, carbon, dissolved inorganic carbon, EA-IRMS, groundwater. 1. INTRODUCTION Carbon has three isotopes that are useful tracers in the terrestrial ecosystem: stable 12C and C; and radioactive 14C. Many investigations, .
