Phosphorous acid, mixed 2,4-bis(1,1-dimethylpropyl)phenyl and 4-(1,1-dimethylpropyl)phenyl triesters

Bioaccumulation: aquatic / sediment

Description of key information

With consideration to the complex composition of the test substance, its bioaccumulation potential was evaluated based on the analysis of three quantifiable components (referred to as component A: MW* 520.68, component B: MW 590.82 and component C: MW 660.95).  The test substance is considered not to be highly bioaccumulative based on the results.

Key value for chemical safety assessment

BCF (aquatic species):

352 dimensionless

Additional information

Bioconcentration factors determined over the exposure period are shown below.

Conc. in environment / dose	Type	Value	Basis	Time of plateau	Calculation basis	Remarks
0.02 mg/L	BCF	6 — 25 dimensionless	whole body w.w.	61 d	steady state
0.002 mg/L	BCF	40 — 352 dimensionless	whole body w.w.	61 d	steady state

 The variations of mean BCFs from three consecutive determinations separated by intervals of more than 48 hours could not be confirmed to not fall within ± 20% at either high or low concentration levels for the components A and B, and at the high concentration level for the component C. However, the BCFs were considered to have reached the steady-state since all of the values were shown to be less than 100 during the exposure period.

The variations of mean BCFs from three consecutive determinations separated by intervals of more than 48 hours were not within the steady state criterion range of ± 20% at the low concentration level for the component C. Bioconcentration factor at steady state (BCFss) was not calculated. Bioconcentration factor (BCF) is shown as a range of factors.

The test substance is considered not to be highly bioaccumulative based on the above results.