Pickling Inhibitors are widely added to pickling solutions containing either hydrochloric acid or sulfuric acid. Most of these inhibitors contain Hexamethylene tetra-amine. These inhibitors are added in very small proportion (say 0.1%). How to calculate concentration of inhibitor in acid by wet chemical testing methods?
Mark A. Nicholls
Becasue pickling inhibitors are usually amine based. You can use an organic digestion in sulfuric acid to release nitrogen followed by the total kjeldahl nitrogen test (titration). This method is very accurate allowing you to measure ppm amounts.
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