Kozinc J, Zupancic-Kralj L, Zapusek A
ERICo Velenje, Institute for Ecological Research, Koroska 58, 3320-SI Velenje, Slovenia.
Chemosphere. 2004 May;55(8):1121-6. doi: 10.1016/j.chemosphere.2003.08.034.
Gas emissions of carbon dioxide, methane, dimethylsulfide, carbon monoxide and oxygen from a coal stockpile in Velenje were determined. Gases from the coal stockpile were collected in Alltech Standard sampling bags and then analysed using a capillary gas chromatograph and electrochemical sensors. A flame ionisation detector equipped with a Zr/Ni catalytic reactor was used for the determination of methane and carbon dioxide. Dimethylsulfide was detected with a flame photometric detector, and the concentrations of carbon monoxide and oxygen were determined by use of electrochemical sensors. The results showed that the main influence on gas emissions is related to the ambient temperature. Emissions of carbon dioxide during summer 2001 (average temperature during sampling period was 24 degrees C) were approximately 30-times higher than during winter 2002 (average temperature during sampling period was -2 degrees C) and were also influenced by the oxygen concentration. Carbon dioxide is mainly formed by oxidation of coal. Methane and dimethylsulfide are desorbed from coal, and are present in higher concentrations in stockpile emissions when stockpiles are renewed. The dimethylsulfide concentration, in contrast to laboratory experiments in stockpile emissions, falls immediately due to photo-degradation.
测定了韦莱涅一个煤堆的二氧化碳、甲烷、二甲基硫醚、一氧化碳和氧气的气体排放情况。煤堆产生的气体收集在奥泰克标准采样袋中，然后使用毛细管气相色谱仪和电化学传感器进行分析。配备Zr/Ni催化反应器的火焰离子化检测器用于测定甲烷和二氧化碳。用火焰光度检测器检测二甲基硫醚，用电化学传感器测定一氧化碳和氧气的浓度。结果表明，对气体排放的主要影响与环境温度有关。2001年夏季（采样期间平均温度为24摄氏度）的二氧化碳排放量比2002年冬季（采样期间平均温度为零下2摄氏度）高出约30倍，并且还受到氧气浓度的影响。二氧化碳主要由煤的氧化形成。甲烷和二甲基硫醚从煤中解吸出来，当煤堆更新时，它们在堆存排放中的浓度较高。与实验室对堆存排放的实验相比，二甲基硫醚的浓度由于光降解而立即下降。
