Some metallorganic complexes can emit fluorescence or phosphorescence when excited by light with suitable wavelength. Usually

the fluorescence and phosphorescence can be quenched by oxygen. 13 kinds of metallorganic complexes were synthesized. Two kinds of them

namely ［Ru(bathophen)3］(ClO4)2 and Pt(TFPP) were selected as oxygen-sensing indicators for excellent characters.Optimal technology for preparation of oxygen-sensing films with high sensitivity

rapid response and excellent photostability was developed.The influence factors of the sensor are discussed. A non-contact fiber-optic oxygen sensor was developed by using ［Ru(bathophen)3］(ClO4)2-Cab-O-Sil-silicone film. The non-contact design makes it possible to monitor a number of samples by scanning in a short time under the control of computer.Furthermore

the sensor was applied in biological toxicity tests.The effects of some heavy metal ions on activated sludge and E.coli were tested with the oxygen sensor. It is feasible to conduct the toxicity test by empolying the oxygen sensor. It has unique advantages in sensitivity and efficiency.