Registration Dossier
Registration Dossier
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EC number: 200-929-3 | CAS number: 76-05-1
Monitoring data
Administrative data
- Endpoint:
- monitoring data
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- no data
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Peer review study. The methodology is scientifically acceptable and the report is sufficiently well documented.
Data source
Reference
- Reference Type:
- publication
- Title:
- Unnamed
- Year:
- 1 998
Materials and methods
- Principles of method if other than guideline:
- TFA was detected and measured in fog, rain, snow and surface water obtained in 1994 -1996 from several locations in California and Nevada.
- GLP compliance:
- not specified
- Type of measurement:
- background concentration
- Media:
- other: fog, rain, snow and surface water
Test material
- Reference substance name:
- TFA
- IUPAC Name:
- TFA
- Details on test material:
- None
Constituent 1
Results and discussion
Any other information on results incl. tables
Fog and rain samples contained 31 - 3779 ng/L TFA. Snow samples taken in more remote areas had 51 - 584 ng/L. Surface water varied from 55 ng/L - 41 µg/L depending on type and location. Washout of TFA from the lower atmosphere was observed in both rain and fog samples. There was a trend toward decreasing TFA in precipitation samples taken at later stages during a single storm event, indicating cleansing of TFA from the lower atmosphere by precipitation.
Applicant's summary and conclusion
- Conclusions:
- Fog and rain samples contained 31 - 3779 ng/L TFA. Snow samples taken in more remote areas had 51 - 584 ng/L. Surface water varied from 55 ng/L - 41 µg/L depending on type and location. Washout of TFA from the lower atmosphere was observed in both rain and fog samples. There was a trend toward decreasing TFA in precipitation samples taken at later stages during a single storm event, indicating cleansing of TFA from the lower atmosphere by precipitation.
- Executive summary:
TFA was detected and measured in fog, rain, snow and surface water obtained in 1994 -1996 from several locations in California and Nevada. Fog and rain samples contained 31 - 3779 ng/L TFA. Snow samples taken in more remote areas had 51 - 584 ng/L. Surface water varied from 55 ng/L - 41 µg/L depending on type and location. Washout of TFA from the lower atmosphere was observed in both rain and fog samples. There was a trend toward decreasing TFA in precipitation samples taken at later stages during a single storm event, indicating cleansing of TFA from the lower atmosphere by precipitation. The magnitude of TFA levels suggest that formation in the environment from HCFC and HFC degradation is occurring more rapidly than expected, or that alternate sources of TFA exist.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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