Carbon disulphide

Monitoring data

Administrative data

Endpoint:

monitoring data

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: meets generally accepted scientific standards and is described in sufficient detail

Data source

Reference

Reference Type:

publication

Title:

Unnamed

Year:

2000

Materials and methods

Principles of method if other than guideline:

There is no guideline available for the measurement of CS2 in water or sediment.
Water samples were taken and CS2 was purged from the samples, pre-concentrated by cryoadsorption and analysed by gas-chromatography.

Type of measurement:

natural background concentration

Media:

other: surface water and sediment

Test material

Test material information

Constituent 1

Reference substance name:

carbon disulfide

IUPAC Name:

carbon disulfide

Details on test material:

CS2 was obtained from Fluka

Study design

Details on sampling:

Samples of 2 litres were taken at different depths, using a PVC tube and a pump. Water was allowed to flow over for 2 min and then the samples were sealed with rubber seal septa to exclude air in the samples. Samples were stored at 4 oC and were analyzed within 4 hrs after sampling.

Results and discussion

Concentration

Concentration 1

Country:

Switzerland

Location:

Alps

Substance or metabolite:

substance

Remarks:

surface water

Conc.:

> 12 - < 150 µmol/L

Remarks on result:

other: based on the stratification of CS2 over the waterlayer it was concluded that CS2 was from a biogenic origin

Concentration 2

Country:

Switzerland

Location:

Alps

Substance or metabolite:

substance

Remarks:

sediment

Conc.:

> 220 - < 400 µmol/L

Details on results:

CS2 concentrations peaked in september to ca 150 µmol/L and were some five times lower during spring.

Applicant's summary and conclusion

Conclusions:

CS2 concentrations in a background area in Switserland ranged from 12 - 150 µmol/L (0.9 - 11 mg/L). These concentrations are partly well above the LC50 concentrations for fish and daphnids.
The stratification and seasonal variation observed in the concentrations leads to the conclusion that CS2 is biogenic in origin. The stratification also suggests bacterial breakdown in the surface waters.

Executive summary:

CS₂ was measured in surface water and sediment in a background location in a lake in the Swiss alps. CS₂ concentrations in surface waters ranged between 12 and 150 µmol/L. In the sediment the concentrations were higher, up to almost 400 µmol/L. The origin of the CS₂ was considered to be biogenic (there are no anthoprogenic sources of CS₂ in the wide surroundings). It was concluded that some bacterial breakdown was occuring in the surface waters. CS₂ was the only sulphur containing volatile compound that could emit to the air. Other compounds were either broken down biologically or abiotically degraded.