실내공기 중 휘발성유기화합물 모니터링을 위한 수동대기채취기의 성능평가

Abstract

Despite the widespread use of passive air samplers (PASs) for measuring indoor volatile organic compounds (VOCs), the performance of PASs has rarely been systematically compared or evaluated. In this study, VOC samples were collected using three types of PASs in a dormitory and an office to compare VOC concentrations and evaluate PAS performance. In addition, an active air sampler (AAS) was employed to calibrate the PAS measurement results. The PASs were deployed over a two-week sampling period. Sampling rates for each PAS were determined using the concentrations of eight compounds detected by the AAS. These sampling rates were then used to correct the PAS-derived concentrations. Before correction, VOC concentrations measured by the PASs differed significantly between the dormitory and the office (RM-ANOVA test: p<0.05). However, after correction, no significant differences in VOC concentrations were observed between the two locations (RM-ANOVA test: p>0.05). In the dormitory, the indoor/outdoor (I/O) ratio exceeded 1 for one compound before correction and for four compounds after correction. In the office, the number of compounds with an I/O ratio greater than 1 increased from four to five after correction. The estimated carcinogenic risk in the dormitory increased from 2.0E-06 to 5.8E- 06 before and after correction, respectively, while in the office, it rose from 2.7E-06 to 7.9E-06, both exceeding the US EPA threshold of 1.0E-06. Since I/O ratios and cancer risk estimates are sensitive to sampling rate corrections, it is crucial to evaluate the reliability of PAS sampling rates thoroughly.