Use Of Diffusion Controlled Preconcentration Systems With Chemically Immobilized Coatings For The Determination Of Atmospheric Nitric Acid |
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| Authors: | M Schilling M C Solci-palhares D Klockow |
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| Institution: | 1. Institut für Spektrochemie , Postfach 101352, D-4600, Dortmund 1, Germany;2. Departamento de Quimica , Universidade Estadual de Londrina , Cx. Postal 6001, 86051, Londrina-Parana, Brazil |
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| Abstract: | Abstract A new coating procedure for different diffusion controlled preconcentration methods (tubular denuder, annular denuder, diffusion screen) is described for the determination of nitric acid in air. In this study, a silanization reaction is applied to obtain a chemically fixed coating with an end placed functional NH2-group, which can be used as a sink to collect acidic compounds from air. This coating must be carried out only once and can be used for a long time. The denuders, coated with this procedures, were compared with conventionally coated NaF denuders. |
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| Keywords: | Immobilization nitric acid diffusion controlled sampling atmosphere |
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