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Biodegradation in water and sediment: simulation tests

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biodegradation in water: sediment simulation testing
Data waiving:
exposure considerations
Justification for data waiving:
the study does not need to be conducted because direct and indirect exposure of sediment is unlikely
Justification for type of information:
Dibromo pentaerythritol (Dinol) is used as a reactive flame retardant in polymers synthesis. It is chemically bound and hence becomes part of the polymeric backbone. To examine the possibility of exposure to Dinol during its intended use, two studies were performed on the two applications. The first application is in UPE (Unsaturated Poly Ester) sheets used for roof in public buildings. The second application is in polyurethane spray foam - one component foam (OCF). The results indicate that for both applications, the potential exposure is negligible.
Application is in UPE sheets
The study examined:
1. The degree of residual monomer (free Dinol) in the tested UPE samples.
2. The leaching of free Dinol from UPE when exposed to water.
To determine the leaching of the free Dinol into water, samples were incubated in water at 40oC for 10 days. To determine exposure the influence of irradiation on leaching some of the samples were irradiated using UV light.
The study results are:
• The UPE sample was found to contain 7.5% total bromine. Assuming that the only source of the halogen is Dinol, the sample contains 12.5% Dinol.
• The average amount of free Dinol in the samples was found to be 0.7±0.1 %;
• Results indicate that 0.15±0.05 % of the free Dinol originally present in the samples leached into water after a 10 days exposure at 40°C.
• Calculating for the total amount of Dinol in the average sample, 0.007±0.002% leached into water after a 10 days exposure at 40°C.
Only 0.7% residual monomer remain unreacted. From the free Dinol, a negligible amount of 0.15% can leach into water, which is equivalent to 0.007% of the total Dinol used. Based on the above, it can be concluded that the exposure of Dinol is expected to be negligible.
Application in polyurethane foam (OCF)
The study examined:
1. The degree of residual monomer (free Dinol) content.
2. The level of free Dinol in the OCF samples.
To determine the level of free Dinol, samples were placed vials with CH2Cl2, shaken for 2 hrs, and then allowed to stand over the weekend before analysis.
The study results are:
• The OCF samples were found to contain on average 4.2% total bromine, which is equivalent to 6.9% of Dinol.
• In all samples, no free Dinol was detected at levels above the detection limit of 50ppm.
• Since no free Dinol was detected, there was no need to test further any potential migration.
No detectable levels of Dinol were found in the polyurethane foam (OCF) and therefore exposure to Dinol is unlikely. In UPE sheets, although some of the Dinol did not react and remained as additive in the plastic matrix, the leaching results indicate that the possibility that the environment will be exposed to significant amounts of Dinol is negligible.
For analytical and test procedure please see the attached reports.

Data source

Materials and methods

Results and discussion

Transformation products:
not specified

Applicant's summary and conclusion