直接燃烧法快速测定煤及煤灰中总汞含量的方法研究

Study on direct combustion method for rapid determination of total mercury in coal and coal ash

探讨直接燃烧法快速测定煤及煤灰中总汞含量方法的主要性能指标,方法的精密度和正确度。结果表明,采用直接燃烧法快速测定煤及煤灰中总汞含量的方法可获得较好的准确度,其方法精密度与ASTM D6722—11中规定的精密度无显著性差异,可直接采用ASTM D6722—11中规定的精密度作为本方法的精密度。方法最佳称样量为(80±10) mg,煤灰样品最佳粒度为0.1 mm,方法检出限为0.016μg/g。

This paper discusses the main performance indexes of direct combustion method for rapid determination of total mercury in coal and coal ash,and the precision and accuracy of this method.The result showed that the direct combustion method can obtain good accuracy and can be used to determine the total mercury content in coal and coal ash,which has no significant difference with the precision specified in ASTM D6722—11.The precision specified in ASTM D6722—11 can be directly used as the precision of this method.The best sample weight was(80±10)mg,the best particle size of coal ash sample was 0.1 mm,and the detection limit was 0.016μg/g.