Volatile fatty acids (VFAs) are designated as offensive odor substances, and they are known for their strong polarity and adsorptive properties, which can lead to significant losses during sample collection and analysis. This study evaluates two analytical methods currently outlined in the odor process test standards, alongside an analytical system utilizing adsorption tubes and another system that uses ion chromatography (IC). Furthermore, suitable analytical methods were proposed for analyzing concentrations below the odor threshold and emission limits. When assessing SPME-GC/FID, SPME-GC/MSD, TD-GC/MSD, and IC based on the internal quality control standards specified in the process test standards, all methods were found to have met these criteria. The absolute injection amounts (1 atm, 25oC) satisfying the emission limits ranged from 3 to 95 ng, while those that met the odor thresholds ranged from 0.2 to 6.5 ng. Based on these criteria, analytical systems suitable for the specified concentration range and odor thresholds were identified. The results are as follows. 1. The analytical systems confirmed to be suitable for quantifying limits were TD-GC/ MS and IC. 2. In terms of recovery and precision, both TD-GC/MSD and IC were found to be suitable. 3. Regarding detection limits, both previously mentioned systems were satisfactory. 4. Finally, concerning quantitation limits, both systems were adequate; however, TD-GC/MSD slightly exceeded the odor threshold analysis range for propionic acid by approximately 1.5 ng. The odor thresholds for the four VFAs were converted to absolute quantities (1 atm, 25oC), confirming that the IC system met the following criteria: (1) calibration range and curve, (2) accuracy and precision, and (3) instrumental detection and quantitation limits.

Abstract
1. 서 론
2. 연구 방법
    2.1 표준물질의 제조
    2.2 정도 평가 및 분석 시스템별 비교
3. 정도 평가 및 분석 시스템별 비교 결과
    3.1 검정 범위(amount range) 및 검량선(calibration)
    3.2 정확도(accuracy) 및 정밀도(precision)
    3.3 방법검출한계(Method detection limit, MDL)및 정량한계(limit of quantification, LOQ)
4. 고 찰
5. 결 론
References

• 강희주(한국공학대학교 생명화학공학과) | Hee Ju Kang (Department of Chemical Engineering & Biotechnology, Tech University of Korea)
• 박승준(한국공학대학교 생명화학공학과) | Seung Joon Park (Department of Chemical Engineering & Biotechnology, Tech University of Korea) Corresponding author