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Environmental fate & pathways

Phototransformation in water

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Administrative data

Endpoint:
phototransformation in water
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment

Data source

Reference
Reference Type:
publication
Title:
Properties of Hydroxyethane Diphosphonate affecting its Environmental Fate: Degradability, Sludge Adsorption, Mobility in Soils, and Bioconcentration
Author:
Steber, J. and Wierich, P.
Year:
1986
Bibliographic source:
Chemosphere 15:7 (1986), 929-945

Materials and methods

Study type:
other: direct photolysis plus biotic degradation
Principles of method if other than guideline:
Exposure of 14C-labelled HEDP in closed flasks; 14CO2 formed was subsequently trapped in ethanolamine by flushing the flasks with nitrogen (4 h; 1 l/h).  Thereafter, test solutions were inoculated and incubated in the dark "post-incubation"). 14C-biomass was determined at the end of incubation as the difference of radioactivity in test suspension and centrifuged solution.
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
not specified

Study design

Radiolabelling:
yes
Light source:
Xenon lamp
Remarks:
Suntest (Hanau Heraeus GmbH, Germany); light intensity 5000 lux
Duration of test at given test condition
Initial conc. measured:
0.2 mg/L

Results and discussion

% Degradationopen allclose all
Test condition:
Direct photolysis
Test condition:
Indirect photolysis

Any other information on results incl. tables

14CO2-evolution from 14C-HEDP after photodegradation and subsequent biodegradation of the 14C-product formed (i.e. acetate)

Testconcentration: 0.2 mg/l (nominal initial concentration)


14CO2-evolution (% of initial radioactivity)


MEDIUM   % DURING EXPOSURE    % AFTER POST-INCUBATION
-----------------------------------------------------------
AAP, 3 days       4                   26
AAP, 7 days      17                   67

AAP:
mineral salts medium according to US EPA; Algal Assay
Procedure: Bottle Test. National Environmental Research
Center, Corvallis, Oregon, 1971

Applicant's summary and conclusion