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SIMULTANEOUS SAMPLING OF PARTICULATES,NITRIC ACID AND AMMONIA IN ATMOSPHERE

Liu Lijun Wang Anpu (Research Center for Eco-Environmental Sciences, Academia Sinica)  
A method of simultaneously collecting atmospheric particulates,nitric acid and ammonia by three-layer filter was established.The first layer was installed with polychloride filter collecting particulates,the second layer was installed with glass fiber filter which was imprengnated with 5% NaCl solution for collecting nitric acid,the third layer was installed with 5% phosphoric acid-1% oxalic acid solution.The different kinds of filters and the imprengnated solutions were compared.The error in sampling ammonia was discussed.This method is feasible in atmospheric condition in general.
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