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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Phototransformation in air

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Endpoint:
phototransformation in air
Type of information:
(Q)SAR
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
Principles of method if other than guideline:
Calculation based on AOPWIN v1.92, Estimation Programs Interface Suite™ for Microsoft® Windows v 4.11. US EPA, United States Environmental Protection Agency, Washington, DC, USA.
GLP compliance:
no
Estimation method (if used):
PHOTOCHEMICAL REACTION WITH OH RADICALS
- Concentration of OH radicals: 0.5E+06 radicals/cm3
- Degradation rate constant: 0.404 E-12 cm3/molecule-sec
- Temperature for which rate constant was calculated: 25 °C
- Computer programme: AOPWIN v1.92
DT50:
39.725 d
Test condition:
calculation based on a 24 h day

For detailed description on the model and its applicability, see "Any other information on materials and methods incl. tables". The estimation is based on a 24 hour day.

Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary Source, Literature cited in OECD SIDS
Principles of method if other than guideline:
Calculation
GLP compliance:
no
Details on test conditions:
Sensitiser (for indirect photolysis): OH
Sensitiser concentration: 330000 molecule/cm³
Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary Source, Literature cited in OECD SIDS
Principles of method if other than guideline:
Calculation
GLP compliance:
no
Details on test conditions:
Sensitiser (for indirect photolysis): OH
Sensitiser concentration: 500000 molecule/cm³
Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary Source, Literature cited in OECD SIDS
Principles of method if other than guideline:
Calculation
GLP compliance:
no
Details on test conditions:
Sensitiser (for indirect photolysis): OH
At 25 deg C.
Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary Source, Literature cited in OECD SIDS
Principles of method if other than guideline:
Calculation
GLP compliance:
no
Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary Source, Literature cited in OECD SIDS
Principles of method if other than guideline:
Calculation
GLP compliance:
no
Details on test conditions:
Rate constant reported at 265 K
Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Secondary Source, calculation cited in OECD SIDS
Principles of method if other than guideline:
Atmospheric Oxidation (25 deg C) AopWin v1.87
GLP compliance:
no
Details on test conditions:
Sensitiser (for indirect photolysis): OH
Sensitiser concentration: 1500000 molecule/cm³

Description of key information

A half-life of 39.73 days was estimated for the substance.

Key value for chemical safety assessment

Half-life in air:
39.725 d

Additional information

Experimental results on phototransformation of chloroethane (CAS 75-00-3) are not available. Calculated values using AOPWIN v1.92 indicate that the substance will be photodegraded by reaction with hydroxyl radicals. The estimated half-life for the substance is 39.73 days. Literature data on the atmospheric half-life report a range of 26.5 to 66.8 days (Altshuller, 1980; Atkinson, 1985 and 1994; USEPA: EPI Summary, v2.41; Printup, 1991; Singh et al., 1979; Snelson et al., 1978; USEPA, 1988).