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Static studies were conducted with Leuciscus idus and Daphnia magna by Richterich and Muehlberg (2001). The 48 h LC50 and 24 h EC50 were both determined to be > 146 mg/L.

No algae and microorganism studies are available on potassium silicate. Data are read-across to sodium silicate. A 72 h EC50 (biomass) in a test with Scenedesmus subspicatus was determined to be 207 mg/L. The EC50 for growth rate was > 345.4 mg/L, the highest concentration tested. In a growth inhibition test using the bacterium Pseudomonas putida the 18 h toxicity threshold (EC10, 10 % inhibition) of a neutralised silicate solution of pH 7.6 - 7.8 was > 3480 mg/L, the highest concentration tested, while for the unneutralised solution (pH 7.9 - 10.4) effects were found at concentrations above 348 mg/L. In a further study the toxicity to Pseudomonas putida was tested in an oxygen consumption inhibition test. Concentrations of a sodium silicate solution (MR 3.0, 34.54 wt%) of up to 3454 mg/L at pH 8.0 - 11.1 did not cause toxic effects.