유도결합플라즈마-질량분석기(ICP-MS)를 이용한 토양의 총 우라늄 정량에 요구되는 적정 산분해 전처리 방법 개발 = Development of Appropriate Acid Digestion Method used for the Determination of Total Uranium in Soil by Inductively Coupled Plasma-Mass Spectrometer (ICP-MS)

다국어 초록 (Multilingual Abstract)

Inductively coupled plasma-mass spectrometry (ICP-MS), one of the most commonly used instruments for metal analysis,was used to determine total uranium in soil. The method was named as “Modified ASTM C1345-96”. When comparingwith ASTM C1345-96, digestion time (2~3 days) was shorten to 7 hours and the treatment in furnace was eliminated. Inanalyses of 26 field soil samples, there was a significant difference in the average concentration of total uranium betweenmodified ASTM C1345-96 and ASTM C1345-96 (F : 6.22 > Fc : 4.03, significance level : 0.05, n=26). The averageconcentration of modified ASTM C1345-96 was 1.8 times larger than that of ASTM C1345-96. In addition, modifiedASTM C1345-96 was compared with other acid digestion methods for soil including ISO 11466, Modified ISO 11466,US EPA-3051, US EPA-3051A and US EPA-3052 using a certificated reference material (SRM 2711a, NIST) and fieldsoil samples with different level of organic matter content (1.6%, 5.8%, 10.6%). Modified ASTM C1345-96 showed thebest accuracy of 93.01% for SRM 2711a. Also, modified ASTM C1345-96 showed the higher extraction rates than otherdigestion methods by 11~45%.

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