Registration Dossier

Administrative data

Endpoint:
toxicity to soil microorganisms
Type of information:
experimental study planned
Study period:
as soon as possible after ECHAs decision

Data source

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 216 (Soil Microorganisms: Nitrogen Transformation Test)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent

Results and discussion

Applicant's summary and conclusion

Executive summary:

Available information on inhibition of nitrification in topsoil samples indicate a strong inhibitory potential of Benzotriazole and Tolyltriazole. In observations with 45 heterocyclic N compounds in three different soils significant inhibition of nitrification (35, 55, and 81 %) at 12 µg Benzotriazole /g soil has been found (McCarty et al.). By comparing the different molecular structures the three vicinal Nitrogen atoms in the triazole ring has been suspected as responsible fragment for the inhibitory effect.

However, the existing data are considered to be not adequate for the chemical safety assessment due to inadequacies in the study design and insufficient information on the purity of the test substances.