GB/T 16659-2008 in English

《GB/T 16659-2008煤中汞的测定方法》由TC42（全国煤炭标准化技术委员会）归口，TC42SC1（全国煤炭标准化技术委员会煤炭检测分会）执行，主管部门为中国煤炭工业协会。
本标准修改采用ISO 15237:2003《固体矿物燃料―――煤中总汞的测定》（英文版）。
本标准依据ISO 15237:2003(E)重新起草。
本标准代替GB/T 16659-1996《煤中汞的测定方法》。
本标准规定了测定煤中汞的冷原子吸收分光光度法和基于原子荧光吸光度测定为原理的测汞仪法。
本标准适用于褐煤、烟煤和无烟煤。
本标准与GB/T 16659-1996相比，主要变化如下：
―――将原标准附录中的测定方法―――冷原子吸收分光光度法列为正文方法。

1 Scope

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

Foreword I
1 Scope
2 Normative References
3 Cold Atomic Absorption Spectrophotometry
4 Mercury Vapourmeter Method
Appendix A (Informative) Comparison between Clauses of this Standard and those in ISO 15237 : 2003 (E)
Appendix B (Informative) Technical Differences and their Reasons between this Standard and ISO 15237: 2003(E)