This Standard specifies the cold atomic absorption spectrophotometry and the mercury vapourmeter method based on the determination of atomic fluorescence absorbance as the principle for the mercury in coal.
This Standard is applicable to lignite, bituminous coal and anthracite.
2 Normative References
The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. For dated reference, subsequent amendments to (excluding corrigendum) or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this Standard are encouraged to study whether the latest editions of these documents apply. For undated references, the latest editions apply.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods (GB/T 6682-2008, ISO 3696: 1987, Water for Analytical Use - Specification and Test Methods, MOD)
3 Cold Atomic Absorption Spectrophotometry
3.1 Principle
With vanadium pentoxide as the catalyst, decompose the coal sample with nitric acid - sulfuric acid to make the mercury in coal transform into the divalent mercury ion and reduce the mercury ion to mercury atom vapor. Determine the mercury content with the cold atomic absorption spectrophotometer.
3.2 Reagents
