Studying Antioxidants in Lubricants with EPR

Asphaltene concentration can be easily measured by ESR once a calibration curve has been made. The calibration curve made using an asphaltene powder dissolved in toluene. The ESR spectra of the various concentrations of apshaltene powder used to make the calibration curve. Active Spectrum has software that will automatically measure the concentration of an unknown sample once the calibration data has been entered.