“…Mottola (88) has also discussed the theoretical aspects of catalytic reactions and has pointed out a number of useful applications in analytical measurements. Catalytic methods have been described for the determination of silver (10), manganese (5,50), selenium (8, 60), arsenic (68), fluoride (16,65), copper (51,98), chromium (69), molybdenum (106), titanium (77), and ruthenium (90). A variety of methods have been described involving the use of enzymecatalysed reactions.…”