열중량분석기를 이용한 방치패각 내 유·무기 이물질 함량 정량화 (Determination of Organic and Inorganic Impurities in Oyster Shell Wastes Through Thermogravimetric Analysis)

서지정보

· 발행기관 : 한국폐기물자원순환학회
· 수록지 정보 : 한국폐기물자원순환학회지 / 41권 / 4호 / 370 ~ 378페이지
· 저자명 : 김석휘, 이상은, 문현성, 정윤웅

초록

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영어초록

In accordance with the enactment of the Fishery By-products Recycling Promotion Act in July 2022, legal standards were established for the resourceconversion of shell wastes containing less than 3 wt% impurities. Oyster shells, primarily composed of calcium carbonate (CaCO3), naturally includeimpurities from the shucking process. Therefore, an effective analytical method for identifying these impurities is necessary to ensure compliance withthe Act. This study aimed to systematize the analytical methods and procedures for quantifying both organic and inorganic impurities in shell wastesusing thermogravimetric analysis (TGA). We determined the appropriate analytical conditions for quantifying various impurities based on differentialchanges in weight loss (Δweight/Δtemperature) resulting from the combustion of organic matter and the decarbonization of CaCO3. The results confirmedthat changes in unit weight loss from TGA effectively distinguish the organic fraction in the shell. Additionally, oyster shells undergo a phase transitionfrom CaCO3 to CaO at approximately 580oC. The organic-inorganic impurity-free CaCO3 content, estimated from TGA results, was around 95.5%, witha reliability of ±2.2% when compared to X-ray fluorescence (XRF) analysis. The findings of this study are expected to provide a reliable method forestimating impurity content, thereby facilitating the re-utilization of abandoned shells as a fishery by-product in the future.

참고자료

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