Registration Dossier
Registration Dossier
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EC number: 701-237-9 | CAS number: -
Phototransformation in water
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:
- 1 986
- 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 substance name:
- Disodium dihydrogen (1-hydroxyethylidene)bisphosphonate
- EC Number:
- 231-025-7
- EC Name:
- Disodium dihydrogen (1-hydroxyethylidene)bisphosphonate
- Cas Number:
- 7414-83-7
- Molecular formula:
- C2H8O7P2.2Na
- IUPAC Name:
- disodium dihydrogen (1-hydroxyethane-1,1-diyl)bis(phosphonate)
- Test material form:
- not specified
Constituent 1
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
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