1.1 ,This test method covers the gas chromatographic determination of impurities in monoethylene glycol including 1,3-dioxolane-2-methanol, diethylene glycol (DEG) and triethylene glycol (TEG). The purity of monoethylene glycol (MEG) is also calculated. A similar test method, using the internal standard calibration technique and the external standard calibration technique, is Test Method E2409.