Easy method of NO
2 measurement used triethanolamine filter paper has been studied by many workers.
In this work, the reliability and accuracy in this method, and many applications were examinea.
1) The scatters of the measured NO
2 concentrations of 10 samples at each station were expressed as nearly normal form distribution, and these in the standard deviation were in about ±20% of average value.
2) The relationship between the sample number N and sampling deviation σ/
X was expressed as Log (σ/
X) =-0.93 Log N+0.447.
3) The relationship between the capsule NO
2 concentration (μg/5m
l) and the daily mean concentration (ppm) of Saltzmann NO
2 meter was expressed by NO
2 (ppm) =0.0125×NO
2 (μg/5m
l) +0.0051 with ±20% error of ppm concentration.
4) The relationship between the measured NO
2 concentrations of upward-capsule and the downward-capsule could be cleared the field-influence of NO
2- mist, particulate contained NO
2-, etc.
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