Losses of Cr content in plant samples using digestion procedures with acids
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In the WEPAL IPE 2009.2 proficiency test, Jožef Stefan Institute (JSI) participated by measuring Cr by k0-INAA; it was the only laboratory providing data by an instrumental technique. The JSI Cr result was about 38% higher than the assigned value in plant sample 124 (Lucerne/Medicago sativum). The same sample was again studied in 2012. This time, more labs, including JSI, used instrumental techniques and the average Cr result was higher and consistent with the 2009 and 2012 JSI results. From the results obtained in the present study, involving four INAA labs, it is confirmed that Cr losses in this sample occurred during the chemical digestion required by the techniques applied by other laboratories, illustrating the inherent advantage of nuclear techniques to be almost matrix independent and independent of the chemical state of the element under study.
KeywordsLosses of Cr Digestion Plant samples k0-INAA
The authors thank the IAEA for the initiative to facilitate laboratories to participate in ILC’s by WEPAL under project TC-RER1007. The Slovenian author kindly acknowledges financial support of the Slovenian Research Agency (ARRS) through programme P1-0143 and the Metrology Institute of the Republic of Slovenia (MIRS) under MIRS/IJS contract No. 6401-5/2009/27 for activities and obligations performed as a Designate Institute as an etalon (standard of measurement) for amount of substance/chemical trace elements/in the organic and inorganic materials. The work of this study is part of project ENVCRM, which was funded within the framework of the EMPIR.
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