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Environmental fate & pathways

Phototransformation in water

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Administrative data

Endpoint:
phototransformation in water
Type of information:
migrated information: read-across based on grouping of substances (category approach)
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Acceptable, well documented publication

Data source

Referenceopen allclose all

Reference Type:
secondary source
Title:
European Union Risk Assessment Report, EDETIC ACID (EDTA), CAS No: 60-00-4, EINECS No: 200-449-4, RISK ASSESSMENT. Final Report
Author:
EU Risk Assessment
Year:
2004
Bibliographic source:
European Chemicals Bureau
Reference Type:
publication
Title:
Aerobic Photodegradation of Fe(III)-(ethylenedinitrilo)tetraacetate (Ferric EDTA)
Author:
Lockhart HB Jr., Blakeley RV
Year:
1975
Bibliographic source:
Implications for Natural Waters. Environ. Sci. Techn. 9 (12): 1035-1038
Reference Type:
secondary source
Title:
European Union Risk Assessment Report, tetrasodium ethylenediaminetetraacetate (Na4EDTA), CAS No: 64-02-8, EINECS No: 200-573-9, RISK ASSESSMENT. Final Report
Author:
EU Risk Assessment
Year:
2004
Bibliographic source:
European Chemicals Bureau

Materials and methods

Principles of method if other than guideline:
To investigate the photodegradation pathway of Fe-EDTA, an aqueous solution of the substance was irradiated with a xenon arc lamp .
The reaction mixture was sampled over a period of 4 days.
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Test substance: Ethylenediaminetetraacetate, disodium salt
Supplier: Eastman Organic Chemicals (unlabelled)
Purity/content: no data
Supplier: Mallinckrodt Chemical Works (labelled, 1-14C-EDTA)
Specific activity: 9.1 uCi/mg

Study design

Radiolabelling:
yes
Light source:
Xenon lamp
Details on light source:
Wide spectrum 5500-W Xenon lamp
Details on test conditions:
To determine the extent of ferric EDTA removal from the environment by interaction with sunlight - i.e. photodegradation - the behaviour of aqueous solutions of ferric-1-14C-EDTA at pH 4.5, 6.9, and 8.5 under irradiation from a xenon lamp has been studied. 
Duration of test at given test condition
Initial conc. measured:
0.002 mol/L

Results and discussion

% Degradation
% Degr.:
100
Sampling time:
24 h
Test condition:
Direct photolysis

Any other information on results incl. tables

Carbon dioxide, formaldahyde, N-carboxy-methyl-N,N'-ethylenediglycine  (ED3A), N,N'ethylenediglycine (EDDA-N,N'), iminodiacetic acid (IMDA),  N-carboxymethyl-N-aminoethyleneglycine (EDDA-N,N), N-aminoethyleneglycine  (EDMA), and glycine have been identified as the major photodegradation products. No nitrilotriacetic acid (NTA) was detected during photodegradation.

The rate of photodegradation was pH dependent, being most rapid at pH 4.5. At a light intensity of 4000-ft candles and an initial concentration of 0.0016 M Fe(III)-EDTA removal was complete after 24 h of irradiation at either pH 4.5 or pH 6.9 and after 32 h at pH 8.5.

Applicant's summary and conclusion