“…In biochemistry, amperometric serisors (although not gas sensors) have been applied t o the determination of proteins, root death, total iron and the concentration of NO,. It has been rcported that the glucose oxidase enzyme can be immobilized at the sureace of the oxygen electrode, and oxygen deficiency at the working electrode due to the enzymatic oxidation has been used for in-vivo and ex-vivo monitoringofglucose [51][52][53][54][55][56][57][58][59][60], lactate [61][62][63],xanthine [64],ascorbic acid [65], microbial grouch [66,67], dopamine [68], and salicylate [ 69,701. The utilization of amperometric sensors ol all kinds for the determination of environmental pollutants has been reviewed recently by Smart [71] and particularly by Janata 1721. hmperometric sensor is used in industry hygiene and safety to determine the quality of the workplace environment.…”