Determination of 210Pb and 210Po in Environmental Samples by Alpha Ray Spectrometry Using an Extraction Chromatographic Resin.

MIURA Tsutomu, HAYANO Kazuhiko, NAKAYAMA Kazushige

doi:10.2116/analsci.15.23

Determination of 210Pb and 210Po in Environmental Samples by Alpha Ray Spectrometry Using an Extraction Chromatographic Resin.

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MIURA Tsutomu

Japan Chemical Analysis Center
HAYANO Kazuhiko

Japan Chemical Analysis Center
NAKAYAMA Kazushige

Japan Chemical Analysis Center

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A determination method using an extraction chromatographic resin (EiChroM Sr.Spec™) has been developed for ²¹⁰ Pb and ²¹⁰ Po in environmental samples by alpha ray spectrometry. ²¹⁰ Pb and ²¹⁰ Po were coprecipitated simultaneously on CuS at pH 4.0 - 5.5. These nuclides were then adsorbed on a Sr.Spec™ resin column (0.79×4.0 cm) in 4 M HCl. The ²¹⁰ Pb and ²¹⁰ Po on the resin were eluted with 8 M HCl and 6 M HNO₃, respectively. ²¹⁰ Po was determined by alpha-ray spectrometry after plating on a stainless-steel disk. ²¹⁰ Pb was determined as ²¹⁰ Po produced from ²¹⁰ Pb decay. The method was applied to soil (IAEA-326) and sediments (NIST-4354, IAEA-135, IAEA-368) standard reference materials, and the results agreed with their recommended values. The chemical yield of Po ranged from 56 to 99% and the yield of Pb was 95%. The detection limits of ²¹⁰ Pb and ²¹⁰ Po were 0.6 mBq/sample at a counting time of 70000 s.