Registration Dossier
Registration Dossier
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EC number: 220-552-8 | CAS number: 2809-21-4
Additional information on environmental fate and behaviour
Administrative data
- Endpoint:
- additional information on environmental fate and behaviour
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Study well documented, meets generally accepted scientific principles, acceptable for assessment.
Data source
Referenceopen allclose all
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 978
- Reference Type:
- other company data
- Title:
- Unnamed
Materials and methods
- GLP compliance:
- no
- Type of study / information:
- Stability in sediments (Stability in Water, Type = biotic)
Test material
- Reference substance name:
- Etidronic acid
- EC Number:
- 220-552-8
- EC Name:
- Etidronic acid
- Cas Number:
- 2809-21-4
- Molecular formula:
- C2H8O7P2
- IUPAC Name:
- (1-hydroxyethane-1,1-diyl)bis(phosphonic acid)
- Test material form:
- not specified
Constituent 1
Results and discussion
Any other information on results incl. tables
% Degradation (60-day)
River Lake
LAS
Sterile
3.67 1.19
Sterile + Light
3.60 1.92
Microbial
32.08 6.34
Microbial + Light
1.88 15.35
Glucose (Lake only)
Sterile
0.31
Sterile + Light
1.15
Microbial
58.82
Microbial + Light
46.66
Test Substance
Sterile
0.40 0.04
Sterile + Light
1.80 3.59
Microbial
1.30, 2.47 1.86, 2.27
Microbial + Light
8.35, 8.53 30.75, 21.12
The effect of temperature variation in the sunlight
exposures
is an unknown factor. Water temperature reached as high as
44
°C during the test. This may have had a significant impact
on
the microbial population and distribution.
In general, the lake water appeared somewhat more active
than
the river water with respect to Dequest degradation. For
LAS,
the reverse was true. Much more acclimation from previous
exposure to LAS in the river than the lake would be
expected.
The reason for the higher activity of the lake water to
Dequest is unknown.
ca. 31 after 60 day(s)
Applicant's summary and conclusion
- Conclusions:
- Slow but significant degradation was observed. Significant
enhancement of the degradation was observed when the
substance was exposed to both microbial action and sunlight.
There are degradation modes operative in the environment
which could prevent long-term persistence.
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