This standard was last reviewed and confirmed in 2018. Therefore this version remains current.
The method is based on weighing a test portion, dissolution in water, addition of ammonium oxalate solution, diammonium hydrogen phosphate solution and ammonium hydroxide solution, allowing to stand for at least 8 h, filtering out the precipitate through filter paper, transfer of the filter paper with precipitate to a prepared crucible, burning it over a gas burner, incineration of the residue in a furnace, cooling in a desiccator, and reweighing.
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|std 1 40|
|std 2 40||Paper|
A standard is reviewed every 5 years
Stage: 90.20 (Under review)
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