Registration Dossier
Registration Dossier
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EC number: 210-871-0 | CAS number: 624-92-0
Biodegradation in soil
Administrative data
Link to relevant study record(s)
Description of key information
Two studies was performed according to the guidelines bEPA OPPTS 835.3300 (Soil Biodegradation) and OECD Guideline 307 (Aerobic and Anaerobic Transformation in Soil)
In the aerobic study, the half-lives of DMDS in each of the four soil samples, without correction for volatile gaseous diffusion of applied DMDS from all soils ranges from 2.89 to 3.04 days. These results demonstrate that diffusion is a controlling factor in the kinetic assessment used in this study. The primary metabolic products of DMDS in soil under aerobic conditions are carbon dioxide and methanesulfonic acid. No other radioactive chemical species were present at greater than 10% of the applied dosage.
In the anaerobic study, the results demonstrate that the primary metabolic product of DMDS in soil under anaerobic conditions is methanethiol. Methanesulfonic acid was found in the precartridge KOH traps before and after neutralizing and resparging. However, it was only present in greater than 10% of the applied dosage in the day 21 interval. Concentrations of methanethiol greater than 15% in soil were found after 14 and 21 days of incubation. Other than methanethiol and methanesulfonic acid, no other radioactive species were present at greater than 10% of the applied dosage. The highest level of carbon dioxide was detected in the final sampling point with a yield of 4.6% of the total dose.
The half-life of DMDS was 14.3 days at the DT50 and 47.4 days at the DT90. These results demonstrate that diffusion is a controlling factor in the kinetic assessment used in this study.
Key value for chemical safety assessment
- Half-life in soil:
- 14.3 d
- at the temperature of:
- 20 °C
Additional information
In the aerobic study, the half-lives of DMDS in each of the four soil samples, without correction for volatile gaseous diffusion of applied DMDS from all soils ranges from 2.89 to 3.04 days. These results demonstrate that diffusion is a controlling factor in the kinetic assessment used in this study. The primary metabolic products of DMDS in soil under aerobic conditions are carbon dioxide and methanesulfonic acid. No other radioactive chemical species were present at greater than 10% of the applied dosage.
In the anaerobic study, the results demonstrate that the primary metabolic product of DMDS in soil under anaerobic conditions is methanethiol. Methanesulfonic acid was found in the precartridge KOH traps before and after neutralizing and resparging. However, it was only present in greater than 10% of the applied dosage in the day 21 interval. Concentrations of methanethiol greater than 15% in soil were found after 14 and 21 days of incubation. Other than methanethiol and methanesulfonic acid, no other radioactive species were present at greater than 10% of the applied dosage. The highest level of carbon dioxide was detected in the final sampling point with a yield of 4.6% of the total dose.
The half-life of DMDS was 14.3 days. DT90 was equal to 47.4 days. These results demonstrate that diffusion is a controlling factor in the kinetic assessment used in this study.
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