| 摘要 |
A method of detecting pollution in an aqueous liquid flow comprises adding a compatible electron transfer mediator to a portion of the liquid. The mixture is passed into a sensor cell in which is contained a living bacteria means, an activity of which is stimulated at least periodically. The level of said activity is measure at an electrode in the cell by means of electron transfer thereto by said mediator. Measurement is preferably carried out in a flow cell. The mediator, which is preferably one or more of potassium ferricyanide and and dimethyl or para benzoquinone is mixed with the aqueous liquid and passed through inlet 1 to carbon or platinum electrode 4 held at 400-550 mV relative to silver/silver chloride reference electrode 5. Electrode 4 is surrounded by bacteria retained by a fine nylon mesh on a translucent alumina filter and the bacteria activity is stimulated by LED light source 6, or, for some bacteria, by glucose and/or fructose. Various suitable bacteria are specified and the detector may be used to determine water pollution. <IMAGE>
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