Computer-controlled potentiometric titration system for rapid determination of sulfuric and organo-sulfonic acids in detergent intermediates
A potentiometric titration system controlled by a desk-top computer is set up for process control analysis and applied to rapid determination of sulfuric and organo-sulfonic acids in detergent intermediates. The computer takes the weight of sample from an automatic top-loading electronic balance, stores it, controls stepwise additions of titrant, detects two end points, and finally prints out the acid contents in weight per cent. During the titration, the rate of titrant additions is adjusted to electrode response time by frequent monitoring of an electrode potential with the computer. Typical titration time is about 60–70 seconds per sample, and the precision of the determination was satisfactory.