Month: February 2020

The biodiesel sample is diluted with a xylene solution. The potassium contentof the sample is directly determine by flame atomic absorption spectoromery (Figure 1) at a wavelength of 766.5 nm with reference to a set of calibration solutions prepared from a potassium organolmetallic salt dissolved in a mixture of xylene and stabilizer. Main Research: Yung … Read more

The biodiesel sample is diluted with xylene solution. The sodium content in the sample is directly determine by flame atomic absorption spectrometry (Figure 1) at the sample wavelength of 589 nm with reference to a set of calibration solutions prepared from a sodium organolmetallic salt dissolved in a mixture of xylene and stock oil. Main … Read more

Method 1: CaF2 Cell Beer’s Law The sample which has been diluted with cyclohexane is introduced into CaF2 (Figure 1) cell and the mid infraned absorption spectrum is recorded. The absorrbance of the typical absorption band for esters at about 1745 cm-1 is measured. The biodiesel content is then calculated with a calibration function produced … Read more

A sample is placed in a sample boat. The boat is then inserted into a high temperature combustion tube where the sulphur is oxidized to sulphur dioxide (SO2) in an oxygen-rich atmosphere. The sample combustion gases are next exposed to ultraviolet (UV) light. The SO2 absorbs the energy from the UV light and is converted … Read more

The sample is heated at 80C in a hermetically sealed vial to allow desorption of the contained methanol into the gas phase. When equilibrium is reached, a defined part of the gas phase is injected into a gas chromatograph (Figure 1), and methanol is detected with a flame ionization detecor. The amount of methanol is … Read more