方案摘要
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Lubricant that is used in compressors of freezer or cooler circulates the cooling circuit with the coolant (CFC-type coolant). The chlorine ion contained such lubricant and coolant may corrode the internal surface of piping and cause failure. This section introduces an example in which approximately 20g of sample was weighed precisely and dissolved in 100mL solvent mixture to be acidified with nitric acid for potentiometric titration with silver nitrate titrant. Cl-+ AgNO3 ——— AgCl + NO3- The amount of chlorides in freezer oils can be determined by silver nitrate titration method by dissolving the sample in organic solvents acidified with nitric acid.
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