Sodium [N-[2-[bis(carboxymethyl)amino]ethyl]-N-(2-hydroxyethyl)glycinato(4-)]ferrate(1-)

Phototransformation in water

Administrative data

Endpoint:

phototransformation in water

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

1989

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The study was not conducted according to guideline/s and GLP but the report contains sufficient data to permit interpretation of study results

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

reference to same study

Cross-reference 2

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

publication

Title:

Aqueous photolysis of the iron (iii) complexes of NTA, EDTA and DTPA

Author:

Svenson A et al.

Year:

1989

Bibliographic source:

Chemosphere, Vol. 18, Nos.9/10, pp 1805-1808, 1989

Materials and methods

Study type:

direct photolysis

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

The rate of photolysis of iron complexes with complexing agent DTPA was analysed. Aqueous solution of the complex was illuminated in a Xenotest 1200. Using a sun spectrum from 60 Deg.N (Stockholm latitude), environmentally related half lifetimes were calculated.

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

N-carboxymethyliminobis(ethylenenitrilo)tetra(acetic acid)

EC Number:

200-652-8

EC Name:

N-carboxymethyliminobis(ethylenenitrilo)tetra(acetic acid)

Cas Number:

67-43-6

IUPAC Name:

N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine

Details on test material:

- Name of test material (as cited in study report): DTPA

Specific details on test material used for the study:

Details on properties of test surrogate or analogue material (migrated information):
Not applicable

Study design

Radiolabelling:

no

Analytical method:

gas chromatography

Details on sampling:

No data

Buffers:

- pH: 7
- Composition of buffer:1 ml of trichloromethane and 3 ml potassium phosphate

Light source:

Xenon lamp

Details on light source:

Illuminated with Xenotest 1200 apparatus, Original Hanau

Details on test conditions:

Absorption spectra of the complexes were recorded in a Beckman DU-8 spectrophotometer. The incident light intensity was measured using a chemical actinometer composed of 10mM uranyl nitrate in 50mM oxalic acid. The oxalic acid concentration was analyzed in a total organic carbon-analyzer.

Reference substance:

yes

Dark controls:

no

Results and discussion

Preliminary study:

No data

Test performance:

No data

Spectrum of substance

Parameter:

not specified

% Degradation

Test condition:

Half lifetime for DTPA was found to be 8.04 minutes

Quantum yield (for direct photolysis):

0.01

Predicted environmental photolytic half-life:

No data

Transformation products:

not specified

Details on results:

None

Results with reference substance:

None

Any other information on results incl. tables

None

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

The half lifetime of DTPA was 8.04 minute for 1:1 complexes, dissolved in the top layer of a water system and illuminated at the yearly maximum sun light in the specified area.