一种间接测定煤中形态硫的新方法

A New Method for Indirect Determination of Different Chemical State Sulfur in Coal

介绍利用 SO2 -4在 Ba Cr O4溶液中 ,可定量置换出 Cr O2 -4,进行原子吸收光谱法测铬 ,间接测定煤中形态硫的新方法。方法较现行使用的重量法简便、快速 ,干扰少 ,硫含量在 0 .0～ 3.0 mg/L范围内符合比尔定律 ,相对标准偏差小于 3.2 % ,方法的检出限为 1.0× 10 -4g/L。方法用于煤样品分析 ,结果满意。并通过在煤化工实验中的应用 ,效果良好。

A new indirect AAS method for determination of sulfur of different chemical state in coal was introduced. The sulfur in the sample is transformed into SO 2- 4 and is reacted with BaCrO 4 to form BaSO 4. The CrO 2- 4 is displaced and the chromium is determined by AAS, and the sulfur content is calculated from the results of chromium determination. Beer's law is obeyed when sulfur content is in the range of 0.0~3.0 mg/L, the RSD is less than 3.2%, and the detection limit of the method is 1.0×10 -4 g/L. The method is rapid, simple and selective as compared with the conventional gravimetric method. It has been applied to the experiment of coal chemical engineering in our department with better results.