MIHAELA MONICA STANCIU-BURILEANU. VENERA MIHAELA STROE, MARIAN MUSAT,ONSTANTIN LUCA, RADU LACATUSU<br>Quantification of Selenium Compounds from Soil Samples by HPLC-ICP-MS

MIHAELA MONICA STANCIU-BURILEANU. VENERA MIHAELA STROE, MARIAN MUSAT,ONSTANTIN LUCA, RADU LACATUSU
Quantification of Selenium Compounds from Soil Samples by HPLC-ICP-MS

Abstract:

Speciation determination can be obtained by solid analysis techniques for samples with high Se concentrations (mg/kg). Such results are not transposable to samples containing low selenium concentrations (µg/kg), in particular in a radiological context or biosphere monitoring. In this paper, it is highlighted the development of some methods regarding the determination of selenium content from soil samples, presuming a preliminary sample preparation. Traditionally, wet acid digestion has been used which involves digestion/heating with strong acids to destroy the organic matter and dissolve the metal ions. The proposed procedure involves microwave sample preparation by using a mixture of HNO3/ Ultrapure water. HPLC-ICP-MS (liquid chromatography-inductively coupled plasma mass spectrometry) was applied to assess the selenium concentrations in some soil samples from Romanian Plain, Central and South Dobrogea. For this purpose, data regarding selenium total content in soil, as well as selenium species from soil are presented, the contents being determined by chemical methods and analytical techniques. For extracting the selenium species existing in the studied soil samples, a 0.1M NaOH solution has been used because it had the greatest efficiency for selenium speciation from soil sample with low content of selenium. The major extractable species was selenite. Keywords: Selenium speciation, environment, hyphenated technique, separation

Issue: 2015, Volume 66, Issue 5

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