管式炉燃烧-红外吸收法测定煤焦油中硫含量

采用管式炉燃烧-红外吸收法对煤焦油中硫含量的测定进行了研究。在研究炉膛温度、延迟时间、比较水平和称样量等对硫含量测定影响的基础上，优化了工作参数。当炉膛温度为900 ℃，延迟时间为30 s，比较水平为1.0，称样量为0.100～0.200 g之间时，硫的测定范围在0.005%～4%（质量分数）之间，校准曲线的相关系数大于0.9，RSD小于3%。本实验方法与国标GB387-90空气流-管式炉燃烧-亚硫酸-氢氧化钠滴定法对比，测定结果基本一致。

Determination of sulphur in coal tar by tube furnace combustion-infrared absorption method

Determination of sulfur in coal tar was studied by tube furnace combustion-infrared absorption method in this paper. The effects of operating parameters on the determination of sulphur were investigated and optimized, such as furnace temperature, delay time, comparison level and sample weight. It was found that the determination range of sulphur was 0.005%-4% (mass fraction) under the condition of 900 ℃ of furnace temperature, 30 s of delay time, 1.0 of comparison level and 0.100-0.200 g of sample weight. The correlation coefficient of linear calibration curve was higher than 0.9, and the relative standard deviation (RSD) was less than 3 %. The determination results by this proposed method were in consistence with those obtained by national standard method GB387-90(air current-tube furnace combustion-sulphurous acid-sodium hydroxide titration).