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KMID : 0364920110360040223
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Journal of Radiation Protection and Research
2011 Volume.36 No. 4 p.223 ~ p.229
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Determination of 226Ra Isotope in the Leachate around Phosphogypsum Stack Using Ethylenediaminetetraacetic Acid (EDTA)
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Kim Geun-Ho
Kim Yong-Jae
Chang Byung-Uck
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Abstract
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Ba is the most useful element to get the Ba(Ra)SO4 precipitate. However, when the high concentrations of ions such as sulfate, calcium are existed in the leachate of phosphogypsum stack, it is difficult to get the Ba(Ra)SO4 precipitate. Since this reason, the developed method for the Ba coprecipitate using EDTA was performed to determine the 226Ra concentration in the high sulfate sample. The average concentration of 226Ra in a leachate of phosphogypsum using this method was 0.102 Bq·kg-1 and the minimal detectable activity is 3.4 mBq·kg-1. The 226Ra stock solution and the CRM (Certified Reference Material) were analyzed to verify this method. In analyzed 226Ra stock solution, bias with added concentration was approximately 1% and the correlation curve between 226Ra concentration in simulated standard sample and measured 226Ra concentration showed good agreement with a correlation coefficient (R2) of 0.99. In analyzed CRM, maximum bias with reference value was 5.8% (k=1) and the analytical results were in good agreement with the reference value.
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KEYWORD
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Radium, Leachate, Phosphogypsum, EDTA, LSC
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