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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

Respiration rate: NOEC (28d) = 525.5 mg/kg soil dw (Lanthanum trichloride, anhydrous)
Nitrate formation rate: NOEC (28d) = 500 mg/kg soil dw (Lanthanum trichloride, anhydrous)

Key value for chemical safety assessment

Additional information

The long term effect of Lanthanum trichloride hexahydrate on carbon transformation activity of soil microorganisms was investigated according to OECD 217 under GLP- conditions. Glucose-induced respiration rates were measured after 0, 7, 14 and 28 days incubation for 12 consecutive hours. The test item caused a maximum inhibition of 19.6% at 1514.2 mg/kg soil dry weight (highest concentration tested) 28 days after application. Only for this concentration a significant difference compared to the control was stated. The EC50 could not be calculated, but it can be concluded that the EC50 is higher than 1514.2 mg test item/kg soil dry weight (1051.0 mg LaCl3/kg soil dw), the highest concentration tested. The NOEC of the test item was calculated to be 757.10 mg/kg soil dry weight (525.5 mg LaCl3/kg soil dw) after 28 days of exposure.

Furthermore, the long term effect of Lanthanum trichloride hexahydrate on nitrogen transformation activity of soil microorganisms was tested according to OECD 216 under GLP-conditions. After 0, 7, 14 and 28 days of incubation of soil, which was amended with powdered plant meal at the beginning of the test, samples of treated and control soils are extracted and quantities of nitrate in the extracts is determined. After 28 days the treatment with 1441 mg LaCl3*6H20 /kg soil dry weight (1000 mg LaCl3 /kg soil dw) showed an inhibition of 18.5 %. Only for this concentration a significant difference compared to the control was stated. The EC50 could not be calculated, but it can be concluded that the EC50 is higher than 1441 mg LaCl3*6H20/kg soil dw (1000 mg LaCl3/kg soil dw), the highest concentration tested. The NOEC of the test item derived from the variance analysis was 500 mg LaCl3/kg soil dw (720 mg LaCl3*6H20)/kg soil dw after 28 days of exposure.