title: Comparison of sampling techniques for studies of nitrous oxide pollution.
abstract: The retention of nitrous oxide in samples of nitrous oxide in air held in disposable plastic syringes, glass syringes and custom-made nylon film bags was studied by means of gas chromatography at intervals of 90 min, 24, 48 and 120 h after filling the containers. After 24 h the nylon bags retained a mean concentration of 94.5% of the original concentration of nitrous oxide. The disposable plastic syringes and glass syringes were unsatisfactory and retained only 80% of the original concentration of nitrous oxide after 90 min. These values decreased to 51% and 31% of the original concentration of nitrous oxide respectively at 24 and 48 h.
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D005898:Glass; D008722:Methods; D009609:Nitrous Oxide / Q000032:analysis*; D009757:Nylons; D010969:Plastics; D013594:Syringes; D013997:Time Factors
chemical_list: D009757:Nylons; D010969:Plastics; D009609:Nitrous Oxide