固定污染源排气中H_2S的便携式气相色谱测定法

Determination of H_2S in Exhausted Gas of Stationary Pollution Source by Using Portable GC

[目的]寻找一种固定污染源排气中H2S的快速准确测定方法。[方法]通过确定色谱仪最佳测试参数、建立标准曲线,进行准确度和精密度试验、SO2干扰试验和现场采样试验分析了便携式气相色谱法测定固定污染源排气中H2S的适用性与优势。[结果]便携式气相色谱法的标准曲线回归方程为:y=91.771x+31.796;该法的精密度好,准确度高。该法的H2S测定上限为152mg/m3,测定下限为0.152mg/m3。当CSO2≤50CH2S时,该法的H2S测试相对误差≤5.0%。受生产工艺影响,SO2和H2S浓度在克劳斯炉出口处度最大,以后随着处理的加强,浓度逐渐减小。各测点CSO2∶CH2S均小于50,结合室内干扰试验结果可以判定,便携式气相色谱法测定各工段H2S浓度时,受SO影响较小。[结论]该法快速可行,适用于野外应急监测HS的测定。

[Objective] The purpose was to find a rapid and accurate detection method for H2S in exhausted gas of stationary pollution source.[Method] Through ascertaining the optimum test parameters of chromatograph and establishing standard curve,performing accuracy and precision test,SO2 disturbance and spot sampling experiments,the applicability and advantage of portable GC for detecting H2S in exhausted gas of stationary pollution source were analyzed.[Result] The regression equation of standard curve of portable GC method was y=91.771x＋31.796.This method had good precision and high accuracy.The upper detection limit of this method for H2S was 152 mg/m^3 and its lower detection limit was 0.152 mg/m3.When the condition is CSO2≤50 CH2S,the relative error of this method for detecting H2S was equal to or less than 5.0%.Affected by production technology,the concn.of SO2 and H2S were highest at outlet of Klaus furnace;after that as treatment was intensified,their concn.were reduced gradually.The CSO2∶CH2S value of each detection point was lower than 50,it could be concluded after taking results from indoor disturbance experiment into account that when the H2S concn.of various processing segments were detected by using portable GC method,it was less affected by SO2.[Conclusion] This method was rapid and feasible,suitable for H2S detection in wild emergence monitoring.