Determination of Wastewater Acids from Chromium Plating and Electropolishing Solutions

摘要

The purpose of this report is to provide calibration data for the online UV-visible, conductivity, and pH detectors associated with the environmental thrust project, which is part of the Benet Laboratories vessel plating program. The chemical literature provides offline laboratory detection of chromic acid from chromium plating wastewater solutions, as well as phosphoric and sulfuric acids from electropolishing wastewater solutions. The chemical literature lacks online detection and calibration data for these wastewater acids and this is essential for the reclamation of these three acids. Not only are these chemical resources wasted if they are not reclaimed, but the U.S. Army pays increasingly more to dispose of these hazardous materials. Specific methods are illustrated here that do provide online detection and calibration of these chromium plating and electropolishing wastewater acids. These methods consist of online UV-visible, conductivity, and pH detection. These data and their associated precisions are sufficient to adequately calibrate these three detectors associated with the environmental thrust project.