Hi,
are there any microwave digestion/oxidation procedures for sulfides (e.g. Na2S, Na2Sx, Ag2S) for further determination of S via ICP-OES ?
I need to do the digestion, since the sulfur in non-digested samples may cause problems with memory effects in the tubings of the ICP-OES device.
But I am afraid, that the aqua regia digestion will produce H2S, which will evaporate and the I will get false results for S, or if it stays in the solution, it will cause the same memory effects.
Is H2O2 (produces SO42- in reactions with sulfides) usable for microwave digestion also?
Thanks,
Jan
The microwave digestion procedure for sulfur analysis given in the following link uses your suggested chemistry of H2O2 oxidation.
http://www.sciencedirect.com/science/article/pii/S0021967399000242
for sulfide minerals, they use other oxidations...
http://www.sciencedirect.com/science/article/pii/S0003267009002554
Under extremely oxidizing conditions and high temperature (mixtures of HNO3/ and acids), H2S would be oxidized to sulfuric acid rather than escape as a gas during the digestion process.
Another method is to use a low temperature oxidation with bromine in carbon tetrachloride followed by addition of nitric acid.
- Badges
- Science method
- Similar topics
- Chemistry
- General Biochemistry
- Biochemical Techniques
- Analytical Chemistry