Dipotassium 3,4,5,6-tetrabromophthalate

Biodegradation in water and sediment: simulation tests

Link to relevant study record(s)

Reference

Endpoint:

biodegradation in water: simulation testing on ultimate degradation in surface water

Remarks:

Mesocosm studies

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Full period not specified, but half-life determined

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Justification for type of information:

A review used to provide key information. Although primary references cited, these were not found.
Details of methods not provided.
Linked to photodegradation testing.
A number of bromonated phthalate fire retardants were assessed.
Some of these were esters which demonstrated initial transformation to the tetrabromophthalic acid and conisdered suitable surrogate to assess ultimate fate of the potassium salt.

Qualifier:

equivalent or similar to guideline

Guideline:

EPA OPPTS 835.3180 (Sediment / Water Microcosm Biodegradation Test)

Version / remarks:

Method not provided in detail in review document

Principles of method if other than guideline:

A number of bromonated phthalate fire retardants were assessed.
Some of these were esters which demonstrated initial transformation to the tetrabromophthalic acid.
The work included assessment of the impact of sunlight.

GLP compliance:

not specified

Remarks:

The work was performed by a research group and not a commercial test laboratory

Radiolabelling:

no

Oxygen conditions:

aerobic

Inoculum or test system:

natural water: freshwater

Parameter followed for biodegradation estimation:

test mat. analysis

Remarks on result:

other: Slow biological degradation reported

Compartment:

natural sediment

DT50:

< 50 d

Type:

not specified

Temp.:

15 °C

Remarks on result:

other: Temperature considered 'standard' and is generally regarded as 15 C

Transformation products:

yes

No.:

#1

Details on transformation products:

A number of bromonated phthalate fire retardants were assessed.
Some of these were esters which demonstrated initial transformation to the tetrabromophthalic acid and conisdered suitable surrogate to assess ultimate fate of the potassium salt. The tetrabromophthalic acid itself lost the bromine in the presence of light.

Evaporation of parent compound:

no

Volatile metabolites:

not measured

Residues:

yes

Remarks:

Phthalic acid remained

Validity criteria fulfilled:

not specified

Conclusions:

Although the details of testing are limited from the EPA review, it is concluded that the class of substance will show ultimate degradation with a combination of aerobic, anearobic and abiotic processes, with sunlight key to the process.

Description of key information

Mesocosm work covering biotic and abiotic processes demonstrated ultimate breakdown under environmental conditions .