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Environmental fate & pathways

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:
1978
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

Constituent 1
Chemical structure
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

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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