An automated system for the determination of the pH of soil

Abstract

Laboratory equipment is described that automatically measures and records pH values of soils at a rate of 100 samples per hour. After initial calibration with standards it operates unattended, and its features include automatic temperature compensation at the water-dispenser inlet, synchronous multiple magnetic stirring and automatic washing of electrodes and containers. A correlation coefficient of 0·966 was obtained when the automated system was compared with a manual method.