都市活動に由来する還元性硫黄化合物の排出

抄録

A simple method for the field sampling of reduced sulfur compounds was developed and evaluated. This method has-100% trapping efficiency and more than 90% of recovery and shows little loss for 24hr storage for both carbonyl sulfide (COS) and carbon disulfide (CS₂). Using this method, ambient concentrations of COS and CS₂ and emissions from sewage treatment plant and municiple landfill sanitary sites (M. L. S) were measured.The result shows that (1) COS and CS₂ concentrations were typically 515±87ppty (parts per trillion by volume) and 44±16pptv, respectively and showed little diurnal variation. However Increase of COS level sometimes occured, indicating emission of COS from urban area.(2) Exhaust from sewage treatment plant and M. L. S. contained more COS and CS₂ than ambient concentrations. From this, annual emissions of COS and CS₂ were estimated.