Determination of Chlorine Contents in Geological Survey of Japan Reference Materials by Prompt Gamma Neutron Activation Analysis |
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| Authors: | Takashi Sano Takaaki Fukuoka Toshiaki Hasenaka |
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| Institution: | College of Environment and Disaster Research, Fuji Tokoha University, 325 Ohbuchi, Fuji 417-0801, Japan;Faculty of Geo-environmental Science, Rissho University, 1700 Magechi, Kumagaya 360-0194, Japan;Department of Earth Sciences, Faculty of Science, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan |
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| Abstract: | We determined chlorine contents in nine GSJ (Geological Survey of Japan) reference materials (JB-1, 1a, 2, 3; JA-1, 2, 3; JR-1, 2) by prompt gamma neutron activation analysis, employing the standard addition method. Pressed powder disks of each reference material were used for neutron irradiation and gammaray measurement, after known quantities (25-200 μl) of sodium chloride solution were added. The influence of the nearby sodium peak overlap was checked, and fluctuations in the chlorine count rate were corrected using silicon as an internal standard. The slopes of calibration lines for seven reference materials (JB-1, 2, 3; JA-1, 2, 3; JR-2) and SiO2 powders fall within 5% error, and their chlorine values were obtained from the intercepts. Chlorine contents in JB-1 a and JR-1 were also determined by using the calibration lines. Our chlorine values ranged from 26.1 to 934 μg g-1, which agrees well with the previously reported values. |
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| Keywords: | chlorine prompt gamma neutron activation analysis geochemical reference materials GSJ igneous rock |
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