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.
Determination of Volatile Sulfur Compounds in Livestock Waste Compost by Gas Chromatography-ion Mobility Spectrometry
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.
gas chromatography-ion mobility spectrometrydetectionvolatile sulfur compounds
万方数据
维普
