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目前国内对大气中SO_2、H_2S等硫化物的监测,基本上仍采用比色分析法,操作琐烦费时,每次分析要10小时以上,灵敏度和精密度也较差。本文报导气相色谱火焰光度法很适合于大气中痕量硫化物的监测。此法的突出优点是:灵敏度很高,SO_2可检测2～5PPb(我国卫生标准是56PPb),H_2S可检测1～3PPb,(卫生标准是7PPb);分析速度快:SO_2、H_2S每次不超过5分钟,同一根色谱柱还可以分析CH_2SH和CS_2等;选择性好,很少受大气中其他物质的干扰,分析操作简便,且实现了分析的连续化和自动化。整个监测系统及仪器装置如图1。
At present, the monitoring of sulfides such as SO_2 and H_2S in the atmosphere in our country is basically still using the colorimetric analysis method. The operation is cumbersome and time-consuming, with more than 10 hours of analysis each time, resulting in poor sensitivity and precision. This article reports that gas chromatography flame photometry is well suited for the monitoring of trace sulphides in the atmosphere. The outstanding advantages of this method are: high sensitivity, SO2 can detect 2 ~ 5PPb (China’s health standard is 56PPb), H_2S can detect 1 ~ 3PPb, (health standard is 7PPb); Analysis speed: SO_2, H_2S each time does not exceed 5 minutes, the same column can also be analyzed CH_2SH and CS_2; good selectivity, little interference by other substances in the atmosphere, the analysis is simple, and to achieve the continuity and automation of the analysis. The entire monitoring system and instrumentation as shown in Figure 1.