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气相中微量总硫采用氧化微库仑法来测定。仪器所用的条件是气样在O_2:N_2=40:160的气流中,在900℃的石英管中燃烧;进样速度是5ml/30秒。因为在该条件下,硫化物转化率为95％以上,所以仪器不需要用标样来标定。加上仪器所用的燃烧管结构简单,这些就是区别其它硫分析仪器的独特之处。文章从化学热力学角度,讨论反应温度和氧分压对SO_2+1/2O_2→SO_3反应的K_p的影响,以摸索提高SO_2得率的途径。又从动力学角度讨论中,反应温度和总气流速度对SO_2转化为SO_3的反应速度的影响,来摸索提高的SO_2得率的途径。仪器最小检测限为0.2PPM。
Trace sulfur in the gas phase is determined by the oxidation microcoulometry method. The instrument used was a gas sample which was burned in a quartz tube at 900 ° C in a gas flow of O 2: N 2 = 40: 160; the injection rate was 5 ml / 30 seconds. Because the sulfide conversion is above 95% at this condition, the instrument does not need to be calibrated with the standard. Coupled with the simple burner tube structure used, these are the unique features that distinguish other sulfur analyzers. The article discusses the influence of reaction temperature and partial pressure of oxygen on the K_p of SO_2 + 1 / 2O_2 → SO_3 reaction from the point of view of chemical thermodynamics, in order to explore ways to improve the yield of SO_2. From the kinetic point of view, we discuss the influence of reaction temperature and total gas velocity on the reaction rate of SO2 to SO3 to explore the way of increasing SO2 yield. The minimum detection limit of the instrument is 0.2PPM.