Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

In a GLP-compliant report (Geurts and van Veenendaal, 2001), preliminary hydrolysis testing was undertaken at 50ºC for five days. A decrease in concentration of less than 1% was observed at pH 4, 7 and 9. Based on this result, it is concluded with no need for further testing in accordance with the OECD guideline, that TCPP is stable in water at pH 4, 7 and 9 at 25ºC, with a half-life greater than or equal to one year.

Two tests for ready biodegradability (one conducted to OECD 301E and the other one is equivalent to OECD 301C) indicated that the chemical only very slowly or not degraded under the conditions of the tests. The results of these tests show that TCPP is not readily biodegradable. One test for inherent biodegradability also conducted, result of the test indicates that TCPP is inherently biodegradable.

Transport and distribution results reflect that most TCPP found in air would be precipitated to soil, and that there is very little movement between soil and water, because transfer via the air compartment is very slow, for a substance of low volatility. In water, the modeled adsorption to sediment is very low. no further testing is necessary.

In bioaccumulation study, fish were kept in flow through conditions for 28 days prior to exposure to test substance; the exposure period was six weeks after which the concentration of TCPP in fish was determined. Aquatic bioconcentration factors (BCF) for fish have ranged from 0.8 to 2.8, which reflects no propensity for TCPP to partition from water into tissues.

TCPP is produced in a closed system and has low volatility. Release to the environment, in particular water, is not expected since the effluent from production is treated mainly at on-site facilities that are designed to handle this waste. Should a release occur it would be expected to be minimal considering the efficiency of the on-site waste treatment plants. In addition, even though TCPP did not biodegrade in the standard assay, its low aquatic toxicity to several different species would suggest that any release would have minimal, if any, impact on the aquatic environment. Also, its Kow value would indicate that it would not have the potential to bioaccumulate.