PM10 연속자동측정기(β-ray) 등가성평가 및 비교관측 연구
PM10 β-ray attenuation samplers (β-ray absorption method) equivalence evaluation and comparatively observed study
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초록
The Asian dust observation network operates β-ray attenuation samplers to measure PM10 concentrations. In addition, equivalence evaluation and accuracy inspection(Precision Tests) are conducted every year for the reliability of data. β-ray attenuation samplers(16 units) were comparatively observed from May to June 2020 and from July to December 2021. During the observation period, the average daily temperature was the lowest at 6.4℃ in December and the highest at 27.3℃ in August. The average daily humidity ranged from 60% to 100%, but the average daily humidity was over 75% from July to September. The minimum value of the PM10 Gravimetric method was 5.0 μg/m3, the maximum value was 53.4 μg/m3, and the average value was 17.8 μg/m3. The equivalence evaluation results of the PM10 Gravimetric method and β-ray attenuation samplers satisfied the criteria (slope: 1±0.1, intercept: 0±0.5). A relative error analysis between the PM10 Gravimetric method and β-ray attenuation samplers equipment showed that the relative error increased when the concentration was low and the temperature and humidity were high. In addition, in the β-ray attenuation samplers 5-minute interval observation data in May 2020, a relatively large Standard devication was shown as an average maximum ±23.4 μg/m3 and a minimum ±15.2 μg/m3. At standard deviations of 10% and 90%, equipment with high variability (deviation) was measured at 6 μg/m3and 61 μg/m3, and equipment with low variability was measured at 12 μg/m3 and 47 μg/m3. It was confirmed that concentration differences occurred due to differences in variability for each equipment.
Abstract
The Asian dust observation network operates β-ray attenuation samplers to measure PM10 concentrations. In addition, equivalence evaluation and accuracy inspection(Precision Tests) are conducted every year for the reliability of data. β-ray attenuation samplers(16 units) were comparatively observed from May to June 2020 and from July to December 2021. During the observation period, the average daily temperature was the lowest at 6.4℃ in December and the highest at 27.3℃ in August. The average daily humidity ranged from 60% to 100%, but the average daily humidity was over 75% from July to September. The minimum value of the PM10 Gravimetric method was 5.0 μg/m3, the maximum value was 53.4 μg/m3, and the average value was 17.8 μg/m3. The equivalence evaluation results of the PM10 Gravimetric method and β-ray attenuation samplers satisfied the criteria (slope: 1±0.1, intercept: 0±0.5). A relative error analysis between the PM10 Gravimetric method and β-ray attenuation samplers equipment showed that the relative error increased when the concentration was low and the temperature and humidity were high. In addition, in the β-ray attenuation samplers 5-minute interval observation data in May 2020, a relatively large Standard devication was shown as an average maximum ±23.4 μg/m3 and a minimum ±15.2 μg/m3. At standard deviations of 10% and 90%, equipment with high variability (deviation) was measured at 6 μg/m3and 61 μg/m3, and equipment with low variability was measured at 12 μg/m3 and 47 μg/m3. It was confirmed that concentration differences occurred due to differences in variability for each equipment.
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