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Diss Factsheets

Administrative data

Endpoint:
phototransformation in water
Type of information:
other: summary of information from several publications
Adequacy of study:
supporting study
Study period:
unknown
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: The references are handbook data.

Data source

Referenceopen allclose all

Reference Type:
secondary source
Title:
No information
Author:
Wang, LK, Hung Y, Lo HH, Yapijakis, C
Year:
1974
Bibliographic source:
Handbook of industrial and hazardous wastes treatment
Reference Type:
secondary source
Title:
No information
Author:
Thomas, EN, Schofer, JL
Year:
1970
Bibliographic source:
Strategies for the evaluation of alternative transportation plans

Materials and methods

Principles of method if other than guideline:
No guideline methods followed, review publications
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Tetrasodium hexacyanoferrate
EC Number:
237-081-9
EC Name:
Tetrasodium hexacyanoferrate
Cas Number:
13601-19-9
Molecular formula:
C6FeN6.4Na
IUPAC Name:
tetrasodium hexacyanoferrate
Test material form:
solid: crystalline

Study design

Radiolabelling:
no

Results and discussion

Preliminary study:
Review data: Aqueous solutions of the alkali metal ferrocyanides are rather stable at room temperature. These solutions slowly decompose, but the hexacyanoferrate complex belongs to the most stable complexes. However, these complexes can be degraded by photolysis, especially by sunlight, to form low concentrations of free cyanide. In another publication it is stated that after a 30-min exposure to sunlight 15.5 mg/L sodium ferrocyanide would release 3.8 mg/L of cyanide after which the concentration remains fairly constant.
Details on results:
Aqueous solutions of the alkali metal ferrocyanides are rather stable at room temperature. These solutions slowly decompose, but the hexacyanoferrate complex belongs to the most stable complexes. However, these complexes can be degraded by photolysis, especially by sunlight, to form low concentrations of free cyanide. In another publication it is stated that after a 30-min exposure to sunlight 15.5 mg/L sodium ferrocyanide would release 3.8 mg/L of cyanide after which the concentration remains fairly constant.

Applicant's summary and conclusion

Conclusions:
The hexacyanoferrate complexes can be degraded by photolysis, especially by sunlight, to form low concentrations of free cyanide.