Recovered refrigerants may contain acids, ______, and oil.

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Moisture is the contaminant most commonly highlighted in recovered refrigerants. It means water content sneaking into the refrigerant during service, leaks, or handling. That water can react with the refrigerant and the system oil to form acids and other corrosive products. Those acids can corrode metal parts, acidify lubricating oil, and promote further degradation of the refrigerant. Because moisture is a typical, harmful contaminant in recovery processes, it fits the statement as the missing element.

Oil is already listed later in the phrase, and while water and moisture are closely related, the standard terminology used is moisture to denote water content in the refrigerant. Salt isn’t a usual contaminant in this context, and thus isn’t the best fit here.