ENZYME GAS-DIFFUSION ELECTRODES FOR DETERMINATION OF PHENOL/

An enzyme/gas diffusion electrode for the determination of phenol conc entration is investigated comprising a new type of porous hydrophobic carbon electrode (made from acetylene black treated with PTFE by a spe cial technology) on which enzyme tyrosinase is immobilized. In the enz yme/gas-diffusion electrode the oxygen needed for the enzymatic reacti on can be transported in gas phase from the air through the porous hyd rophobic carbon electrode to the immobilized enzyme. It is shown that the fast O-2 supply in the gas phase results in an increase of the amp erometric signal of the phenol electrode and an enlargement of the lin ear part of its calibration curve. The described phenol enzyme/gas-dif fusion electrode is applied also for monitoring of phenol vapour.