Method for the Determination of Nitrogen Dioxide, Sulfur Dioxide and Formaldehyde in the Atmosphere by using Triethanolamine Filter Paper

Abstract

The triethanolamine-filter paper can be used for the measurement of not only nitrogen dioxide but also sulfur dioxide and formaldehyde in the atmosphere.
The test paper is a filter paper that is soaked in 20% triethanolamine solution and dried at room temperature.
The test paper is exposed in the atmosphere for one or two days in a plastic cell.
After the exposure, it is extracted with water, and nitrogen dioxide, sulfur dioxide and formaldehyde in the extracted solution are measured by diazotizing method, p-rosaniline method and 4-amino-3-hydrazino-5-mercapto-1, 2, 4-triazol method (AHMT method), respectivery.