and digested with 10 ml concentrate HNO3 + 2.5 ml concentrate H2SO4 + 1.5 ml HCIO4 + 2.5 ml HF mixture in closed vessel microwave digestion system according to program in Table 1.
and digested with 10 ml concentrate HNO3 + 2.5 ml concentrateH2SO4 + 1.5 ml HCIO4 + 2.5 ml HF mixture in closed vessel microwave digestion system according to program in Table 1.