The sampling bag is used as a storage container for odor gas samples. It is known that the substances recovery rate of odor bags decreases during storage time, and the degree of recovery varies depending on the characteristics of the gas sample and the material of the bag. This study investigated the recovery rate of VFA (ACA, PPA, BTA, VLA) in PEA bags during storage time. In addition, a model was developed to estimate the recovery rate of each substance as a function of time. Standard gas (ACA, PPA, BTA, VLA mixed) recovery rate was used for the model development. The concentration of the compound in the bag was measured by SIFT-MS at intervals of 1 to 2 hours. The recovery rate according to the storage time was calculated as the ratio to the initial concentration. The recovery rate of each substance according to the storage period (12h, 24h, 36h, 48h) was ACA (66.2%, 62.8%, 55.6%, 52.0%), PPA (77.6%, 72.1%, 63.0%, 58.1%, 86.6%), BTA (86.6%, 81.3%, 71.6%, 66.9%), VLA (94.8%, 89.0%, 76.6%, 71.7%). The recovery rate continued to decrease over the course of 48 hours of storage time. ACA, PPA, and BTA showed the greatest decrease within the initial 12 hours, which is form of exponential decrease. Therefore, we considered a 1~3 degree polynomial regression model and a 1~2 degree exponential decay model. Each developed model was evaluated by r², RMSE, MAPE, AIC, and then a model for each substance was selected. Selected models were tested with recovery rate data from swine farm odor samples. Only the ACA model exhibited a good performance (r² = 0.76).

Abstract
1. 서 론
2. 연구내용 및 방법
    2.1 SIFT-MS
    2.2 표준물질 회수율 평가
    2.3 돈사 시료 회수율 평가
    2.4 회귀모델
3. 결과 및 고찰
    3.1 표준가스 회수율 측정 결과
    3.2 물질 별 모델 비교 평가
    3.3 돈사 시료에 대한 모델 검증
4. 결 론
References

• 우샘이(국립축산과학원 축산환경과) | Saemee Woo (Animal Environment Division, National Institute of Animal Science (NIAS))
• 서시영(국립축산과학원 축산환경과) | Siyoung Seo (Animal Environment Division, National Institute of Animal Science (NIAS))
• 정민웅(국립축산과학원 축산환경과) | Min-Woong Jung (Animal Environment Division, National Institute of Animal Science (NIAS))
• 박준용(국립축산과학원 축산환경과) | Jun-Yong Park (Animal Environment Division, National Institute of Animal Science (NIAS))
• 장유나(국립축산과학원 축산환경과) | Yu-Na Jang (Animal Environment Division, National Institute of Animal Science (NIAS)) Corresponding Author