of 60 s each at 10% and 0%, one stage at 30% of 300 s;
and a final stage, vented for 300 s). 25 ml of ultra pure
water were added to each of the samples and the samples
were transferred to vials.
2.9. Analytical procedure
Three sub-samples of each material were digested
using the above method. All measurements were run in
triplicate for the sample and standard solutions.