Most machine coolant analysis requires gas chromatography to determine the type of glycol in the coolant mixture. The percentage of glycol in a coolant and the freezing point are two of the most common tests ensuring a proper coolant blend, but calculating these two results begin by assuming the type of glycol base. In the blog photo, notice 39 coolant samples prepared for glycol identification with gas chromatography. The majority of these happened to be ethylene glycol, but the height of the response peak varied across many of the samples due to impurities that otherwise wouldn’t have been detected.
We recommend gas chromatography, then ion chromatography, followed by tests for machine wear and additive depletion and oxidation. 39 samples through a gas chromatograph is a solid twelve hours of machine time after all samples are prepared and glycol standards are run through the instrument to establish retention times.