In this study, the homogeneity and stability of standard samples for proficiency testing in indoor air quality within the country (formaldehyde, benzene, toluene, ethylbenzene, p-xylene, styrene, TVOC) were evaluated. The procedures and statistical analysis methods applied in ISO/IEC 13528 (2009) and KS A ISO Guide 35 (2005) were applied as evaluation methods. The homogeneity evaluation was a statistical analysis of repeated measurements of each of the 11 ports and between the 11 ports concentration data. As a result, the coefficient of variation (CV) was within the range of 1.9%~5.9%. The difference between the ports was found to be insignificant and met the statistical standard specified in KS Q ISO 13528. The stability evaluation was assessed by the change in concentration over the long-term stability of the standard samples stored for 90 days. The coefficient of variation (CV), which was within the range of 2.6%~9.0%, exhibited changes in the concentration of the long-term stored standard samples. However, the results satisfy the statistical standard specified in KS A ISO Guide 35. Overall, there is no significant difference between the homogeneity of the standard samples by the port and the stability of the long-term stored samples. Therefore, it is considered to be an appropriate method to supply standard samples in an indoor air quality proficiency test.

1. 서 론
 2. 숙련도 시험용 시료의 선정 및 평가방법
  2.1 시험용 시료(PTMs)의 선정
  2.2 시험용 시료(PTMs)의 균질성 및 안정성 평가 방법
  2.3 측정 및 분석방법
  2.4 균질성 및 안정성 평가방법
 3. 결과 및 고찰
  3.1 시료 채취용 펌프의 유량 보정
  3.2 정도관리
  3.3 균질성 평가
  3.4 안정성 평가
 4. 결 론
 References

• 채정석((주)그린환경종합센터, Green Environmental Complex Center) | Jeong-Seok Chae
• 장미경((주)그린환경종합센터, Green Environmental Complex Center) | Mi-Kyung Jang
• 김선태(대전대학교 환경공학과, Department of Environmental Engineering, Daejeon University) | Sun-Tae Kim
• 최종우(국립환경과학원 환경측정분석센터, Environmental Infrastructure Research Department, National Institute of Environmental Research) | Jong-Woo Choi
• 김금희(국립환경과학원 환경측정분석센터, Environmental Infrastructure Research Department, National Institute of Environmental Research) | Kum-Hee Kim
• 홍석영(국립환경과학원 환경측정분석센터, Environmental Infrastructure Research Department, National Institute of Environmental Research) | Suk-Young Hong
• 이진주(국립환경과학원 환경측정분석센터, Environmental Infrastructure Research Department, National Institute of Environmental Research) | Jin-Joo Lee
• 김지혜(국립환경과학원 환경측정분석센터, Environmental Infrastructure Research Department, National Institute of Environmental Research) | Jee-Hye Kim
• 전준민((주)그린환경종합센터, Green Environmental Complex Center) | Jun-Min Jeon Corresponding author