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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 photodegradation plus subsequent biotic degradation
Principles of method if other than guideline:
Test in small outdoor basins (volume ca. 3 cubic metres, depth 1 m) filled with water from a reservoir (Verse-dam). Exposure of 14C-HEDP solutions in closed 100 ml test flasks at various depths of water. 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").
GLP compliance:
no

Test material

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

Study design

Radiolabelling:
yes
Light source:
sunlight
Duration of test at given test condition
Initial conc. measured:
0.1 mg/L

Results and discussion

% Degradationopen allclose all
% Degr.:
>= 27 - <= 40
Sampling time:
11 d
Test condition:
Degradation during expsosure period following daylight exposure (June 1982) at depths between 10-100 cm in water (based on 14CO2 + 14C-biomass)
% Degr.:
>= 11 - <= 19
Sampling time:
11 d
Test condition:
Degradation during expsosure period following daylight exposure (September 1982) at depths between 10-100 cm in water (based on 14CO2 + 14C-biomass)

Any other information on results incl. tables

Degradation extent (14CO2 + 14C-biomass) in % of initial
radioactivity after exposure (incl. 2-week post-incubation
in the dark) was dependant on water depth and test period:


% degradation
water depth [cm] June (11 d) Sept. (11 d)
---------------------------------------------------
10 40 19
50 32 11
100 27 12
Dark 15 10

Applicant's summary and conclusion