Dried seafood (0.2 g) and 5 ml of concentrated HNO3 were
added together into a PTFE bomb. After 10 min the bombs were
sealed off and put into an oven at 80C for 4 h. Afterwards the
bombs were cooled down and the gas was released to discharge
the high pressure in the bombs. The bombs were then placed back
in the oven at 170C for 4 h. After cooling down the bomb, 1 ml
H2O2was added onto the residue inside the bomb to form a clear solution. This solution was diluted to a final mass of 25 g with
deionized water for ICP-MS analysis.
The total arsenic content in the dry seafood samples was mea-sured before and after extraction using inductively coupled plasma
mass spectrometry (ICP-MS). The rare earth element89
Y was used
as an internal standard. The interference correction equations were
chosen from the library for EPA200.8 to correct
75
ArCl
+
interference.