Diammonium [[N,N'-ethylenebis[N-(carboxymethyl)glycinato]](4-)-N,N',O,O',ON,ON']manganate(2-)

Phototransformation in water

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

Reference

Reference 1

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 2

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 3

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

Test material information

Constituent 1

Reference substance name:

Disodium dihydrogen ethylenediaminetetraacetate

EC Number:

205-358-3

EC Name:

Disodium dihydrogen ethylenediaminetetraacetate

Cas Number:

139-33-3

IUPAC Name:

disodium dihydrogen 2,2',2'',2'''-(ethane-1,2-diyldinitrilo)tetraacetate

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.