with HNO3 was best for the purpose of the
present study. The possible loss of the micro-components
during the mineralization step were investigated.
Experiments were carried out as follows.
A precipitate of thiuram disulfide was prepared in
RDW. It was spiked with the elements under
study and treated as described in section Section
2.2.2. The results of the ICP-AES determination
showed no loss of the analysed elements in the
course of analysis.