Possibility of nitrate monitoring in water based on mollusc bioindicative reaction
Joanna Chmist, Krzysztof Szoszkiewicz
The most municipal waterworks in Poland utilise surface water resources which requires precise monitoring of its quality. An effcient pollution removal is still a common problem causing delivery of water of inadequate quality parameters. The periodic control of water parameters does not eliminate all of possible risks and only the use of continuous monitoring system of water adequately protected against possible distribution of contaminated water. For several years, the instrumental methods of water quality monitoring are often supported biological monitoring and the most common are systems using mollusc. The paper presents results of experiment utilising the Unio tumidus species, whose natural reaction to sudden changes of environment parameters is shell closing. The impact of nitrate pollution was tested, and the four different
concentrations of nitrates was applied: 4, 10, 50 and 100 mg/l. The degree of shells opening was controlled as well as the average time of complete closure caused
by pollution was estimated. It has been shown that animal reaction is strong and distinct, and Unio tumidus resistance to short-term high nitrate concentrations proves that they are a very good indicator species.