An embodiment provides a method for measuring an amount of total organic fluoride content of a PFAS containing sample, including: placing a sample comprising a PFAS compound in a measurement device; introducing the sample into a combustion tube, the combustion tube comprising a catalyst; oxidizing the PFAS, using heat and the catalyst, to produce a combusted sample of a plurality of measurable simpler compounds; adjusting, using a valve, a moisturization of the combusted sample; and measuring, using the measurement device, an amount of total organic fluoride of the sample after the oxidation. Other aspects are described and claimed.