Abstract
Abstract A commercial acid concentration meter containing an N-type silicon anode and stainless cathode has been used to selectively measure hydrofluoric acid in mixtures containing nitric, phosphoric and sulfuric acids. At very high weight ratios of acid to HF (> 10:1) a suppression in HF response was noted for all acids examined. At lower ratios or higher HF values only nitric acid influences HF response with a sensitizing or catalytic effect not appreciably dependent on HNO, concentration.
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