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Diss Factsheets

Ecotoxicological information

Toxicity to soil microorganisms

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Reference
Endpoint:
toxicity to soil microorganisms
Type of information:
experimental study
Adequacy of study:
disregarded due to major methodological deficiencies
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
significant methodological deficiencies
Remarks:
See 'Any other information on results'
Duration:
21 d
Dose descriptor:
NOEC
Effect conc.:
3 mg/kg soil dw
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
nitrate formation rate

The test item showed negligible effects in short-term respiration experiments up to a concentration in the soil corresponding to five times the maximum recommended field rate, i.e. effects observed ranged from + 6 to + 14 % after 28 days of incubation. Furthermore, it was shown, that the ammonification and nitrification in both soils was not significantly affected by the test substance. After 28 days of exposure the effects observed ranged from -15.3 (soil II, low treatment level) to + 2.6 %. After prolonged incubation (day 57) of the low treatment level samples of soil II the effect dropped to -10. 7 %. Therefore, no negative effect of the test compound on organic matter turnover and hence on the soil fertility may be expected from the use of this test substance.

RMS STATEMENT

The study is not valid. The course of nitrogen mineralisation is not typical, because the nitrate content does not increase. Usually the ammonium content decreases and the nitrate content goes up.

Description of key information

A NOEC of 3 mg/kg soil dry weight was determined based on nitrate formation rate, BBA Teil VI, 1-1 (2. Auflage), Wuethrich 1994. The study was not deemed reliable (reliability score 3).

Information on this endpoint is not part of Annex VIII data requirements; all included studies are marked as supporting information and considered in the CSA.

Key value for chemical safety assessment

Additional information