METHOD OF BIOTESTING OF THE WATER ON THE HEAVY METALS POLLUTION Russian patent published in 2008 - IPC C02F3/32 G01N33/18 

FIELD: environmental protection; methods of biotesting of the water on heavy metals pollution.

SUBSTANCE: the invention is pertaining to the method of the analytical biotesting of water. For the biotesting -cultivate the plants of the duckweed small Lemna minor L. at the permanent daylight and the temperature mode and the composition of the growth mineral medium. The biotesting duration makes 7 days. The toxicity degree is estimated through the mean day gain of the growth share of the duckweed small and compute it by the formula: D =(B-A)/A·t, where A is the initial number of the small leaves of duckweeds in the probe; B - the final number of the small leaves; t - growth time (in days). The number of the small leaves is counted in the probes on 2-d, 5-th and 7-th day of the test. Availability of the pollutants determine by the complex of the morphological changes of the duckweed. In the capacity of the morphological changes of the duckweed use the specific changes of the color of the young and mature plants with the characteristic localization on the small leaves, conservation of the groups of the duckweeds small leaves or their decay - partial or complete, conservation or dropping of the roots. The method allows to increase the information value of the water biotesting system.

EFFECT: the invention ensures the increased information value of the water biotesting system.

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