The control of water quality from the biologic aspect is governed by the standard CSN 75 7711 "Biologic Analysis of Water". A proposal has been prepared for modification of the current standard CSN 75 7711 by quantitative determination of phytoplankton by the volume biomass.
The methodology of determination of the volume biomass is based on measuring the cells of the phytoplankton, comparing the form of the cells with simple geometric objects, and calculating the volume of the cells by using such objects (measuring the width and length in ?m). The size of the volume biomass was determined for regularly occurring kinds of phytoplankton in the Janov reservoir.
The found values were used for calculation of the percentage of selected types of phytoplankton in the total volume biomass. The results show that the size of the volume biomass created by small pikoplankton organisms is negligible as compared with the size of the biomass created by larger kinds of phytoplankton. It is necessary to state the limit of the volume biomass for assessment of the qualitative conditions of the treated water. This limit should be stated also from the aspect of operation and maintenance of water orders. From the toxicologic aspect, the volume biomass provides the best information on the contents of toxins.
Figure 2: Comparison of percentage of the number of cells in 1ml of treated and raw water with the total volume biomass.
Author: J. AMBROZOVA - In: Vodohospodársky spravodajca (Water Management Journal) - Year 43, No. 6(2000), p. 14-15.
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