The influence of hydrothermal nanosilica powder aquaspersions on the vital capacity of Daphnia magna Straus crustaceans

This paper cites the results of measuring the influence of aqueous dispersions of nanosilica samples (separated from hydrothermal heat-transfer agent solutions at certain geothermal power plants) used for experimental and industrial purposes on the death-rate of Daphnia magna Straus. The results of the tests conducted in accordance with the approved procedure demonstrate that nanosilica at the concentration of less than 4 × 10-2 g/dm3 does not have toxic influence on Daphnia in the aqueous medium. This fact supports the ecological safety of Russian techniques for utilising nanodispersive silica of a hydrothermal origin in such spheres as plant growing (when plants are treated with nanosilica above the roots on the open-air soil) and production of new types of fish feed in interior and exterior reservoirs.