期刊
MICROCHEMICAL JOURNAL
卷 101, 期 -, 页码 1-4出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.microc.2011.09.008
关键词
Tungsten coil; Atomic emission spectrometry; Strontium; Aluminum; Soil; Radioactive dispersion device; Dirty bomb
资金
- National Science Foundation
- Department of Homeland Security [CBET 0736214, 2008-DN-077-ARI001-02]
Strontium was determined in soil by tungsten coil atomic emission spectrometry (WCAES). Since aluminum enhances strontium emission and is a common component of soil, it was first necessary to develop a method to remove aluminum from digested soil solutions. This was accomplished by buffering solutions to a pH of 5.5 with ammonium bicarbonate. Each buffered solution was filtered through a 0.45 mu m syringe filter. Twenty-five mu L of the filtrate were injected into a WCAES instrument and analyzed. The method effectively removed aluminum from digested samples. The next goal was to develop a fast soil digestion method that could be used in field analyses. A potential application for a fast method is the detection of radioisotopes after the detonation of a radioactive dispersion device (dirty bomb). Such devices could potentially contain strontium-90, and a field method would be necessary to quickly determine the concentration of strontium. Two different soil digestion methods were tested. The first (method A) was a typical method using aqua regia, hydrogen peroxide, and heat. The second (method B) was a faster method that involved shaking soil with concentrated acid for 30 s. Strontium spike recoveries showed that method B was not as effective at recovering strontium from soil. The % strontium recoveries (method B) were 87% compared to 93% for method A. A NIST SRM San Joaquin Soil was analyzed using both soil digestion methods. Strontium recoveries were 76% and 59% for methods A and B respectively, suggesting that digestion conditions needed to be more thorough. (C) 2011 Elsevier B.V. All rights reserved.
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