Dimethyl sulfoxide

Biodegradation in soil

Administrative data

Endpoint:

biodegradation in soil: simulation testing

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Data source

Reference

Reference Type:

publication

Title:

Unnamed

Year:

1993

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

No data

GLP compliance:

no

Test type:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Dimethyl sulfoxide

EC Number:

200-664-3

EC Name:

Dimethyl sulfoxide

Cas Number:

67-68-5

Molecular formula:

C2H6OS

IUPAC Name:

dimethyl sulfoxide

Results and discussion

% Degradation

% Degr.:

> 60

Parameter:

other: DMSO reduction to DMS

Sampling time:

12 wk

Half-life / dissipation time of parent compound

Type:

other: DMS measurement

Transformation products:

yes

Identity of transformation products

No.:

#1

Reference

Reference substance name:

Unnamed

IUPAC name:

dimethyl sulfide

Inventory number:

InventoryMultipleMappingImpl [inventoryEntryValue=EC 200-846-2]

CAS number:

75-18-3

Identity:

Methane, thiobis-

Identity:

Methyl sulfide

Identity:

Thiobismethane

Molecular formula:

C2H6S

Molecular weight:

62.134

SMILES notation:

CSC

InChl:

InChI=1/C2H6S/c1-3-2/h1-2H3

Details on transformation products:

The reduction of DMSO to dimethyl sulfide (DMS) in soil was measured in a range of 47 New Zealands topsoils and humus samples.
The relationships between the rate of DMSO reduction and soil type and land use, organic C and N, the soil microbial C estimated by the substrate-induced-respiration (SIR) method, mineralization of N under anaerobic incubation and the mineralization of organic S, were investigated.

DMSO was reduced rapidly in all soils and rates ranged between 180 and 8124 ng DMS/g soil/h, with the coefficient of variance being typically <10%.

Reduction was significantly correlated with the organic carbon and N content of the 44 mineral soils (r=0.61 and 0.62 respectively), anaerobically mineralized N (r= 0.80), microbial biomass C (r=0.81) and aerobically mineralized SO4-S (r=0.60).

The reduction of DMSO was shown to be more sensitive to the presence of Cr (VI) or As (V) than was the SIR response. The sensitivity and reproducibility of the assay make the technique potentially useful for the study of microbial activity in aggregates, rhizospheres samples and contaminated soils.

Details on results:

Results being expressed as ng DMS/g microbial biomass/hour, it has not been possible to properly calculate back a real percentage of degradation for DMSO. Nevertheless, based on the conclusion of hte Author, the degradation is fast and it is expected to have more than 60% of degradation at the end of the experiment.