Registration Dossier

Environmental fate & pathways

Additional information on environmental fate and behaviour

Currently viewing:

Administrative data

Endpoint:
additional information on environmental fate and behaviour
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: No standard test procedure, but in accordance with generally accepted scientific standards and described in sufficient detail. Peer reviewed.

Data source

Referenceopen allclose all

Reference Type:
publication
Title:
Oxidation rate of sulfite in water and its bearing on the origin of sulfate in meteoric precipitation
Author:
Tsunogai S
Year:
1971
Bibliographic source:
Geochemical Journal 5: 175-185
Reference Type:
secondary source
Title:
SIDS Initial Assessment Report for SIAM 26, Sodium sulfite, CAS: 7757-83-7, Draft of March 2008
Author:
OECD
Year:
2008

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
The oxidation rate of aqueous sulfite solutions was studied in rainwater and heavy metal containing solutions
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Any other information on results incl. tables

Oxidation rates of sulfite (initially 0.5 - 0.7 ppm):

 Metal (ppm)  EDTA (mM)  Temp (°C)  Rate constant (h-1)
 Deionized water  -  20 -25  0.009
 -  0.1  20 -25  0.0002
 Fe, 1  -  25  >4.9
 Fe, 1  0.1  20 -25  0.008
 Fe, 0.1  -  25  0.36
 Fe, 0.1  -  20  0.29
 Fe, 0.05  -  15  0.13
 Cu, 0.1  -  20  0.27
 Mn, 0.1  -  20  0.12
 Al, 0.1  -  20  0.086
 Co, 0.1  -  20  0.057
 Rain, june 18, 67  -  20  0.068

The reaction is substantially of the first order and the rate is much accelerated by the presence of small amounts of heavy metals. The half-life time of sulfite in the natural rain water is more than a few hours.

Applicant's summary and conclusion