气相色谱–离子迁移谱检测畜禽有机废物堆肥中的挥发性硫化合物

    Determination of Volatile Sulfur Compounds in Livestock Waste Compost by Gas Chromatography-ion Mobility Spectrometry

    • 摘要: 采用气相色谱–离子迁移谱技术,建立了检测畜禽有机废物堆肥中挥发性硫化合物–甲硫醚、乙硫醚、二甲基二硫醚和二硫化碳的方法。样品经除氨后用采气袋收集,经MXT-1气相色谱填充柱分离,采用正、负两种模式,在优化的载气流量和系统温度条件下进行检测。结果表明,4种挥发性硫化合物在各自线性范围内均表现出良好的线性关系(R2>0.99);检出限为0.008~0.097 mg/m3,回收率为85%~116%,相对标准偏差(Relative Standard Deviation,RSD)为1.13%~8.42%。该方法无需浓缩富集等预处理,仅采用气袋就可完成堆肥恶臭气体的收集,检测灵敏、响应快速,可用于堆肥气体中挥发性硫化合物的现场监测。

       

      Abstract: A method for determination of volatile sulfur compounds-dimethyl sulfide, diethyl sulfide, dimethyl disulfide, and carbon disulfide in livestock waste compost was established using gas chromatography–ion mobility spectroscopy technology. The sample was collected using a gas sampling bag after ammonia removal, separated on a packed gas chromatography column of MXT-1, and detected in both positive and negative modes under the optimized experimental conditions. The results showed that the four sulfur compounds represented good linearity (R2>0.99) in their respective linear ranges; the detection limits were 0.008~0.097 mg/m3 with recoveries of 85%~116% and relative standard deviation (RSD) of 1.13%~8.42%. The method is free of pretreatment such as pre-concentration or enrichment, sensitive and rapid, and the collection of odorous composting gas can be conducted using a gas sampling bag. The method is sensitive and rapid, which can be used for on-site monitoring of volatile sulfur in compost gas.

       

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