Field determination of rhenium in plants using catalytic test methods with dimethyldithiooxamide and Sulfonitrazo P |
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Authors: | L V Borisova V A Ryabukhin O D Bozhkov Kh Ts Tsvetkova |
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Institution: | 1.Vernadsky Institute of Geochemistry and Analytical Chemistry,Russian Academy of Sciences,Moscow,Russia;2.Institute of General and Inorganic Chemistry,Bulgarian Academy of Sciences,Sofia,Bulgaria |
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Abstract: | Methods for the field determination of rhenium in plants have been developed. The speciation of rhenium in solutions throughout
the process of sample preparation has been investigated. It has been shown that, in the initial ethanol and water-salt extracts,
rhenium occurs as perrhenate ions. Perrhenate ions have been established to be partially reduced in time to give Re(VI). Since
test methods have been developed for determining rhenium as perrhenate-ions, their partial reduction in the process of sample
preparation can lead to an low level of the results. The optimal conditions for preserving rhenium as perrhenate ions have
been determined. Two procedures (in four versions) providing the determination of as low as 5 ng of rhenium in a 1-g sample
with an error below 23% have been proposed. The developed procedures have been applied in the places of the collection of
plant materials for the regional investigation of the occurrence of rhenium in the territories of different ore contents. |
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