Journal
MICROCHIMICA ACTA
Volume 150, Issue 1, Pages 9-14Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-005-0318-7
Keywords
arsenic; mineralization; HG; AFS; ICP-MS; speciation
Categories
Ask authors/readers for more resources
The efficiency of several mineralization methods for As determination in marine organisms has been evaluated. Wet mineralization in closed reactors at 150 degrees C with acids (HNO3/HClO4/H2SO4) and K2S2O8 and microwave-assisted digestion with HNO3/H2O2 or with HNO3/H2O2= HCl does not quantitatively destroy the organic matter of fish. This was ascertained by comparing the As content obtained by HG-AFS with that obtained by ICP-MS. Dry-ashing destroys organic As species and the resulting As recovery when HG-AFS is applied is similar to that obtained by ICP- MS. Similar arsenic contents were obtained for all the mineralization methods tested when arsenic was analysed by ICP- MS. These results indicate that when HG-AFS is applied for arsenic determination, the organic matter should be completely oxidised ( e. g. by UV photo-oxidation and K2S2O8) to transform organic arsenic compounds into those able to generate hydrides. The results have been validated with a fish candidate reference material (CRM) (EU SEAS plaice) with a known content of total arsenic. Arsenic speciation after 1: 1 methanol- water extraction (which provides quantitative arsenic recovery after two consecutive extractions) by HPLC- ICP- MS shows that cuttlefish only contains arsenobetaine, which explains the difficulty of mineralization.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available