Abstract
Previously the authors reported that rush carpets used in Japanese houses had the capacity to adsorb ambient NO/sub 2/ and the capacity endured for several years. The fate of adsorbed NO/sub 2/ was investigated in the present report. The outlet gas of a contacting tube packed with test material was monitored with a chemiluminescence analyzer for NO/sub 2/ and NO. Rush, lawn grass, and ginkgo leaves were found to adsorb NO/sub 2/ and to liberate NO. At steady state, the conversion of adsorbed NO/sub 2/ to NO reached 70%. The high conversion meant the reduction of adsorbed NO/sub 2/ by some organic matter. The reducing component was isolated by fractionation and identified as a kind of polysaccharide contained in the free sugar fraction of rush. The reduction rate was highly dependent on humidity, and a relation with clustered water in sugar was suggested. 8 references, 7 figures, 3 tables.
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