Registration Dossier

Environmental fate & pathways

Additional information on environmental fate and behaviour

Administrative data

Endpoint:
additional information on environmental fate and behaviour
Remarks:
Concentration stability in water up to solubility level
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2020
Report date:
2020

Materials and methods

Test guideline
Qualifier:
no guideline available
GLP compliance:
no
Type of study / information:
Attepts to stabilize concentrations during aquatic studies were not attainable, this study was conducted in order to test the addherance of the substance to the system equepment

Test material

Constituent 1
Chemical structure
Reference substance name:
Reaction mass of 1-hydroxypropan-2-yl diethylphosphinate and 2-hydroxypropyl diethylphosphinate
EC Number:
829-436-7
Cas Number:
2230512-72-6
Molecular formula:
C7H17O3P
IUPAC Name:
Reaction mass of 1-hydroxypropan-2-yl diethylphosphinate and 2-hydroxypropyl diethylphosphinate
Test material form:
liquid
Details on test material:
R&D level

Results and discussion

Any other information on results incl. tables

Adsorption to test vessels was observed for p-t-butylphenyl diphenyl phosphate. The percentage of the nominal fortification adsorbed to the sample vessels ranged from 7.42% to 15.9% for samples fortified at a nominal concentration of 7.22 μg/L p-t-butylphenyl diphenyl phosphate. For samples fortified at a nominal concentration of 72.2 μg/L p-t-butylphenyl diphenyl phosphate, the percentage of the nominal fortification adsorbed to the sample vessels ranged from 9.25% to 21.4%. The associated recoveries of the analysis of decanted samples, representative of the dissolved concentration ranged from 63.9% to 87.9% of the nominal fortification. The total recovery associated with these samples ranged from 84.2% to 96.4% of the nominal fortification with respect to p-t-butylphenyl diphenyl phosphate, illustrating acceptable mass-balance for the sample analyses of p-t-butylphenyl diphenyl phosphate.

Adsorption to test vessels was observed for bis(t-butylphenyl)phenyl phosphate. The percentage of the nominal fortification adsorbed to the sample vessels ranged from 9.15% to 23.6% for samples fortified at a nominal concentration of 2.54 μg/L bis(t-butylphenyl)phenyl phosphate. For samples fortified at a nominal concentration of 25.4 μg/L bis(t-butylphenyl)phenyl phosphate, the percentage of the nominal fortification adsorbed to the sample vessels ranged from 6.71% to 30.3%. The associated recoveries of the analysis of decanted samples, representative of the dissolved concentration ranged from 52.6% to 83.5% of the nominal fortification. The total recovery associated with these samples ranged from 77.6% to 100% of the nominal fortification with respect to bis(t-butylphenyl)phenyl phosphate, illustrating acceptable mass-balance for the sample analyses of bis(t-butylphenyl)phenyl phosphate.

Applicant's summary and conclusion

Conclusions:
The test substance was fortified in freshwater at two concentrations in replicates. Fortified samples were processed to determine dissolved and adsorbed concentration of the test substance by analyzing p-t-butylphenyldiphenyl phosphate and bis(t-butylphenyl)phenyl phosphate in test solutions. The sample solutions were decanted and the fortification vessels were rinsed with solvent. The rinsates of sample vessels and decanted portions were analyzed for p-t-butylphenyldiphenyl phosphate and bis(t-butylphenyl)phenyl phosphate to determine the amount of test substance adsorbed to sample vessels. Analyses were conducted at hour 0, 6, 24 and 48 after fortification. Adsorption of test substance residues to the sample vessel was observed.
Executive summary:

Analyses were conducted at hour 0, 6, 24 and 48 after fortification. Adsorption of test substance residues to the sample vessel was observed.