Abstract
A possible loss of cadmium and iron from the sample during dry ashing of the kidney, liver or carcase was examined by the radioactive isotope labelling technique. Cadmium-115 m or iron-59 was administered to rats 4–7 days before the rats were killed and samples collected. Dry ashing in different types of dishes and wet digestion with nitric acid were compared. There was no loss of cadmium or iron by volatilization during dry ashing at 600° or 450° respectively, but a significant amount of iron was bound on glass or porcelain crucibles. Storage of ashed and dissolved samples (in 10 nitric acid) did not show any change of cadmium or iron concentration up to 9 days.
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