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ISO 5073:2021 pdf download – Brown coals and lignites — Determination of humic acids ISO standards download

ISO 5073:2021 pdf download – Brown coals and lignites — Determination of humic acids

ISO 5073:2021 pdf download - Brown coals and lignites — Determination of humic acids. 4 Principle 4.1 Total humic acids Extraction of an analysis sample of coal is carried out with an alkaline sodium pyrophosphate solution. Carbon...
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