No.6（2011）14.Development of test methods for color fastness to nitrogen oxides

Akiko Okada, Mamoru Asakura, Takako Koshiba

  We examined a method for testing color fastness to nitrogen oxides. In the test methodology of Japanese Industrial Standards, sulfuric acid is dropped onto sodium nitrite which chemically generates the nitrogen oxide to be used. This method is hazardous to the examiners health due to the high concentration of nitrogen oxide which leaks into the lab. We examined two methods of supplying the nitrogen oxide via gas canister as substitute for the Japanese Industrial Standards. The first method involves continuously supplying nitrogen oxides into the exposure chamber from a canister. The second method stores high concentration nitric monoxide in the gas sample backing and injects it into the extraction exposure chamber using a syringe. As a result, the dispersion of concentration in the exposure chamber could be suppressed using the nitrogen oxides supplied from a cylinder to make a practicable, steady examination.

Keywords
nitrogen oxides, test method for color, test-control fabric, gus cylinder, Japanese Industrial Standards

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