Registration Dossier
Registration Dossier
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EC number: 451-900-9 | CAS number: 894406-76-9
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
A study was carried out according to OECD Guideline 216, OECD Guideline 217 and EPA OPPTS 850.5100 (Soil Microbial Community Toxicity Test) using the structural analog Didecyldimethylammonium chloride (DDAC). In view of the chemical and structural similarities (the relevant chemical part of both, DDAC and DDACarbonate, under the conditions of this test is the common quaternary ammonium cation Didecyldimethylammonium+), it is considered that the data are adequate for DDACarbonate.
The difference in CO2 production and nitrogen transformation between the treated and the untreated soil samples did not exceed 50 % after 28 days of incubation. The test item is therefore considered to have a low potential for adversely affecting the microbial functions of sandy loam and low humic content sand soils, according to the OPPTS 850.5100 guideline.
The highest inhibition recorded during the test was 82.5 % inhibition of the nitrification with sandy loam soil after 5 days at 10 µg AI/g soil dw. However, after 28 days of incubation the inhibition was less than 25 %. Therefore, it was not necessary to extend the test beyond 28 days or to perform a final test. The NOEC was determined to be > 1 mg AI/kg soil dw. The test item can be characterized as having no long-term influence on nitrogen and carbon transformations in soils according to the OECD 216 and 217 guidelines.
Key value for chemical safety assessment
- Long-term EC10 or NOEC for soil microorganisms:
- 1 mg/kg soil dw
Additional information
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