Biosensors for environmental control
نویسندگان
چکیده
Various kinds of biosensors were developed for the environmental control. Microbial sensor consisting immobilized yeasts and oxygen probe has been applied to estimation of 5-day BOD. The response time of BOD sensor was less than 20 mm and the minimum measurable BOD was 3 mg l-. Amperometric microbial sensor for ammonia was constructed with immobilized nitrifying bacteria and an oxyger probe. The minimum measurable concentration was 0.1 mg l. The output of the sensor was almost constant for more than 10 days and 200 assays. A sensor consisting of the aerobic recombinant-deficient bacteria and the oxygen electrode could be applied to the preliminary screening of chemical mutagens and carcinogens. Preliminary screening of mutagens was possible within a hour. In addition, other biosensors for nitrite, sulfite ion and methane gas were described.
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