title: Characterization of temporal variations in landfill gas components inside an open solid waste dump site in Sri Lanka.
abstract: A long-term monitoring of composition of landfill gases in the region with high rainfall was conducted using an argon assay in order to discuss air intrusion into the dump site. Gas samples were taken from vertical gas monitoring pipes installed along transects at two sections (called new and old) of an abandoned waste dump site in Sri Lanka. N2O concentrations varied especially widely, by more than three orders of magnitude (0.046-140 ppmv). The nitrogen/argon ratio of landfill gas was normally higher than that of fresh air, implying that denitrification occurred in the dump site. Argon assays indicate that both N2and N2O production occurred inside waste and more significantly in the old section. The Ar assay would help for evaluations of N2O emission in developing countries.
  
  
  
  A long-term monitoring of composition of landfill gases in the region with high rainfall was conducted using an argon assay in order to discuss air intrusion into the dump site. Argon assays indicate that both N2and N2O production occurred inside waste and more significantly in the old section.
authors: a Center for Environmental Science in Saitama , Kazo , Saitama , Japan.
authors: Masanao
authors: M
authors: Nagamori
authors: b Department of Agricultural Engineering, Faculty of Agriculture , University of Peradeniya , Peradeniya , Sri Lanka.
authors: M I M
authors: MI
authors: Mowjood
authors: a Center for Environmental Science in Saitama , Kazo , Saitama , Japan.
authors: Youichi
authors: Y
authors: Watanabe
authors: a Center for Environmental Science in Saitama , Kazo , Saitama , Japan.
authors: Yugo
authors: Y
authors: Isobe
authors: c Center for Material Cycles and Waste Management, National Institute for Environmental Studies , Tsukuba , Ibaraki , Japan.
authors: Tomonori
authors: T
authors: Ishigaki
authors: d Graduate School of Science and Engineering, Saitama University , Sakura-ku, Saitama , Saitama , Japan.
authors: Ken
authors: K
authors: Kawamoto
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods; D005740:Gases / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D009609:Nitrous Oxide / Q000032:analysis; D012037:Refuse Disposal; D062611:Solid Waste / Q000032:analysis*; D013188:Sri Lanka; D013997:Time Factors; D064091:Waste Disposal Facilities
chemical_list: D000393:Air Pollutants; D005740:Gases; D062611:Solid Waste; D009609:Nitrous Oxide; D009584:Nitrogen