We used three gas sensors to monitor hydrogen sulfide, ammonia, and volatile organic compounds (VOCs), which were frequently emitted from environmental facilities, such as municipal wastewater treatment, livestock manure treatment, and food waste composting facilities. Two electrochemical (EC) sensors for detecting hydrogen sulfide and ammonia, and a photoionization detector (PID) sensor for detecting VOCs were characterized in this study. The performance of their linearity by concentration levels, lower detection limit (LDL), repeatability, reproducibility, precision, and response time were tested under the laboratory condition. The linearity according to concentration levels were favorable for all three sensors with high correlation coefficients (R2 > 0.98). The ammonia sensor showed the highest LDL (18.6 ppb) and the hydrogen sulfide and VOC sensors showed 22.3 ppb and 26.7 ppb of LDL, respectively. The reproducibility and precision were favorable for all three sensors, indicating a lower relative standard deviation (RSD) than 0.9% in the reproducibility test and 7.2% in the precision test. The response times to reach target concentration were varied from 1 to 12 minutes. The ammonia sensor needed 12 minutes of response time at 1 ppm target the NH3 concentration and the hydrogen sulfide and VOC sensors needed less than 2 minutes of response time.

Abstract
1. 서 론
2. 연구내용 및 방법
    2.1 사용 악취센서
    2.2 악취센서의 성능시험 방법
3. 연구결과 및 고찰
    3.1 악취센서의 농도에 따른 반응성
    3.2 악취센서의 최소검출 한계
    3.3 악취센서의 정확성 및 재현성
    3.4 악취센서의 도달시간
    3.5 악취센서 전처리 시스템과 보정에 대한 고찰
4. 결 론
References

• 한상우(안양대학교 환경에너지공학과) | Sangwoo Han (Department of Environmental and Energy Engineering, Anyang University)
• 이춘상(안양대학교 환경에너지공학과) | Chunsang Lee (Department of Environmental and Energy Engineering, Anyang University)
• 주흥수(안양대학교 환경에너지공학과) | hungsoo Joo (Department of Environmental and Energy Engineering, Anyang University)
• 김경찬(안양대학교 환경에너지공학과) | Kyungchan Kim (Department of Environmental and Energy Engineering, Anyang University)
• 김선영(안양대학교 환경에너지공학과) | Sunyoung Kim (Department of Environmental and Energy Engineering, Anyang University)
• 유현진(안양대학교 환경에너지공학과) | Hyunjin Ryu (Department of Environmental and Energy Engineering, Anyang University)
• 이종민((주) 센코) | Jongmin Lee (Senko Corporation, LTD)
• 김현수((주) 센코) | Hyunsoo Kim (Senko Corporation, LTD)
• 한진석(안양대학교 환경에너지공학과) | Jinseok Han (Department of Environmental and Energy Engineering, Anyang University) Corresponding author