A C&EN Feature

摘要: The single most important factor in the revitalization of analytical potentiometry has been development novel ion-selective electrodes. Ten years ago, few chemists predicted that electrodes specific for more than a dozen ions would join pH-type glass electrode commercial production and widespread use by 1967. These measure directly activity (rather concentration) an ion solution. They are nondestructive, portable, easy to use, relatively inexpensive—about $30 $145. now used clinical analysis, water analysis oceanographie research, process control, routine laboratory determinations. Although isolated workers such as B. Lengyel E. Blum sensitive metal 30 little progress was made long regarded membrane preferentially permeable hydrogen ion. Not until tracer experiments K. Schwabe H. Dahms systematic ...