การเปรียบเทียบการวิเคราะห์หาปริมาณสารต้านอนุมูลอิสระในน้ำมันหล่อลื่น ด้วยเทคนิคเอฟทีไออาร์และลิเนียร์สวีปโวลแทมเมทรี

• Main Authors: กวิสรา ศรีภุชงค์, เจริญขวัญ ไกรยา
• 其他作者: ธวัชชัย ตันฑุลานิ
• 格式: Senior Project
• 語言: Thai
• 出版: จุฬาลงกรณ์มหาวิทยาลัย 2020
• 主題: สารประกอบฟีนอล; แอนติออกซิแดนท์; น้ำมันหล่อลื่น; Phenols; Antioxidants; Lubricating oils
• 在線閱讀: https://digiverse.chula.ac.th/Info/item/dc:10692
• 機構: Chulalongkorn University

Phenols are additives which used for anti-oxidation in turbine oils. The determination of the antioxidants in turbine oils can be used to predict its service life. In these studies we use the linear sweep voltammetry and Fourier transform infrared spectrometer to determine the amount of antioxidants in turbine oils. Results showed that using FTIR technique to determine the antioxidants gave higher amount of antioxidants than that using linear sweep voltammetry (ca. 96% of total analysis). To find the difference in both techniques with the use of green solution to extract samples before determining the antioxidants with both techniques, the result cannot tell the difference in both techniques. Furthermore, adding the antioxidant standards that have the same properties with additives in turbine oils showed that phenol standards gave higher amount of antioxidants in turbine oils while other antioxidant standards did not. Using mass spectrometry to determine the composition in turbine oils and the extracted turbine oils showed that the mass spectra of the extracted turbine oils had more composition and higher intensity. However, with only the molar mass cannot confirm the real composition of extracted turbine oils. These studies cannot be concluded why both techniques gave different results. Therefore, to predict the service life of turbine oils, both techniques should be used. Keywords: