Registration Dossier

Administrative data

Endpoint:
phototransformation in air
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

Test material

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

Results and discussion

Any other information on results incl. tables

Exposure of 14C-HEDP in sterile mineral salts medium
resulted in production of only small amounts of 14CO2 but of
considerable amounts of 14C-labelled products which could be
mineralized very quickly following bacterial inoculation and
subsequent dark incubation (post-incubation). The abiotic
transformation of HEDP to biodegradable products increased
with exposure time.

HPLC analysis of exposed test solutions showed that acetate
was the biodegradable product formed by photodegradation of
HEDP. The amount of 14C-acetate (as % of initial
radioactivity) found after exposure of 14C-HEDP in sterile
solutions corresponded very well to the 14CO2 evolved after
bacterial inoculation and subsequent dark incubation
 (post-incubation). On the other hand, the amount of
residual
14C-HEDP after exposure was quantitatively comparable with
the 14C-radioactivity remaining in solution after
post-incubation.

Applicant's summary and conclusion