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Environmental fate & pathways

Biodegradation in water: screening tests

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Calculation with BIOWIN v4.10 (EPIWIN software by US-EPA). According to Biowin 1 and 2 the substance is biodegrading fast. The Ultimate Biodegradation Timeframe is "weeks", whereas the Primary Biodegradation Timeframe reveals "days" as result. Both MITI Models predict that the substance is not readily biodegradable. Overall Ready Biodegradability Prediction: No 
Prediction using Toxtree (v.2.5.0) - class III chemical - unknown biodegradability

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Additional information

For 1-Propanesulfonic acid, 3-mercapto-, monosodium salt (CAS 17636-10-1) the biodegradability can be predicted by the computer program BIOWIN v4.10 (EPIWIN software) by US-EPA (Chemservice S.A., 2011). The program calculates with seven different models: Linear Model (Biowin 1), Non-linear Model (Biowin 2), Ultimate Biodegradation Timeframe (Biowin 3), Primary Biodegradation Timeframe (Biowin 4), MITI Linear Model (Biowin 5), MITI Non-linear Model (Biowin 6) and Anaerobic Model (Biowin 7). The overall result consists of the ready biodegradability prediction for the target compound. According to Biowin 1 and 2 the substance is biodegrading fast. The Ultimate Biodegradation Timeframe is "weeks", whereas the Primary Biodegradation Timeframe reveals "days" as result. Both MITI Models predict that the substance is not readily biodegradable, which is also the overall prediction result. Under anaerobic conditions the substance is expected to be degraded fast. No GLP criteria are applicable for the usage of this tool, but due to the fact that it is a scientifically accepted calculation method, the estimations performed are reliable with restrictions and can be used for the chemical safety assessment.

Further prediction was performed with the help of the Start plug-in in Toxtree (v.2.5.0) by Chemservice S.A. (2011).The START (Structural Alerts for Reactivity in Toxtree) plug-in is a developed rulebase, which estimates the biodegradability potential of a chemical compound based on structural alerts compiled from the Canadian EPA (START2008). The chemical was assigned to the class III - unknown.