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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Biodegradation in soil

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Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Half-life in soil:
7.2 h
at the temperature of:
20 °C

Additional information

A study was conducted to determine the biodegradanility of the substance according to US EPA Guideline 162 -1. The study was undertaken before the more all-encompassing guidelines were developed within OECD/Europe, therefore it is appropriate to assess for validity against these guidelines as being relevant at the time of undertaking the test. Under the study conditions, BIT degrades rapidly (DT50 < 1 day) to BIT-S-oxide (oxidation)

BIT-S-oxide is rapidly transformed to Saccharin (oxidation). Saccharin is transformed to o-sulphobenzamide (hydrolysis), which is then, via an unspecified route, incorporated into the biomass or transformed to CO2. Based on the study results, it is reasonable to assume that as a worst case, the DT90 of BIT is 24 hours (in reality, no BIT remained after 24 hours). Therefore, assuming first order kinetics, the DT50 is equivalent to DT90/3.32.


DT50: 7.2 hours

DT90: 24 hours

Rate constant = ln2/DT50 = 2.3 d-1 (Powell and Roberts, 1989)