Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information


No abiotic degradation of the test item was observed. 1,3-Dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione is found to be stable at 50°C at all three pH-values. Therefore it can be assumed that the test item is also stable at 25 °C and no half-life times and hydrolysis rates were calculated.


The ready biodegradability of the substance was determined according to OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I)). Within 28 days, a degradation rate of 0 % was determined. Based on this result, the substance is regarded as not ready biodegradable.


In accordance with Section 1 of REACh annex XI, a bioaccumulation study is scientifically unjustified. The substance can be expected to have a low pontential for bioaccumulation, because the substance has a low octanol water partition coefficient (LogPow = 0.3-0.4).


The adsorption coefficient of 1,3-dihydro-4(or 5)-methyl-2H-benzimidazole-2-thione was tested according to OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC)). The adsorption coefficient of the test item is deteminined to be: log Koc = 1.9 or Koc = 79 L/kg.