Examination in Precision and Accuracy of a Simplified Short-term Exposure Method for the Measurement of Atmospheric NO2 Concentration.
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The Amaya′s (1981) method of measuring atmospheric NO<SUB>2</SUB>, a simplified shortterm exposure method, was applied to examine the precision and accuracy in the measurement of atmospheric NO<SUB>2</SUB> concentration. When the NO<SUB>2</SUB> concentration was relatively small (<7 ppb), the variation coefficients were significantly different among five capsules installed in the plural sites. In the case of the NO2 concentration higher than 7 ppb, however, the variation coefficients were relatively stable, and the values were smaller than 13 %. It was also found that the exposure over 24 hours led to increase the variation coefficiency and to decrease the absorption efficiency. In order to examine the precision and accuracy, this method was carried out at a public monitoring station. As a result, the NO<SUB>2</SUB> concentration by this method (x) had a good correlation (r=0.82) with the station data (y), and the relationship was described as follows :y=0.73 x+0.14.However, it seems that some cases of measuring showed the decrease of absorption effiency, depending on the meteorological conditions.
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社団法人 環境科学会 | 論文
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