earticle

영어

Ethylene glycol is frequently used chemicals in the coolant of internal combustion engines which is essential for the proper function of the engine. In this study, the analysis by GC/MS was adopted through ketalization and esterification of ethylene glycol in the oil with cyclohexanone and phenylboronic acid to check out whether the lubricant oil was polluted by the chemical in the coolant. Acetonitrile was used as extracting solvent and the detection limit for ethylene glycol in acetonitrile solvent was less than 0.1 g/g. The linearity of the calibration curves plotted by the characteristic ions of m/z 99 and m/z 148 for the reaction of ethylene glycol with cyclohexanone and phenylboronic acid against the ions of m/z 103 and m/z 152 which are the characteristic derivatized ions of deuterium substituted ethylene glycol shows good linearity of r2 values of 0.9926 and 0.9986 in the concentration range of 10 g/g . 1,000 g/g. The recovery was about 72 % for both derivatization methods for the oil containing 1,000 g/g of ethylene glycol. Especially, the method by using was relatively easy in the derivatization because the heating was not necessary.