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Environmental fate & pathways

Phototransformation in air

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Endpoint:
phototransformation in air
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
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:
weight of evidence
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:
weight of evidence
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:
weight of evidence
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:
weight of evidence
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:
weight of evidence
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:
weight of evidence
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).