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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

The bioaccumulation potential of the test item was estimated by calculation of the BFC value with EPIWIN software using BCFBAF v1.5. A. A  BCF value of 0.293 L/kg wwt was calculated. Thus cyanuric chloride was considered that it is unlikely to have bioaccumulation potential.

Key value for chemical safety assessment

BCF (aquatic species):
0.293 L/kg ww

Additional information

The study on the bioaccumulation in aquatic species preferably fish was waived as its performance is scientifically not justified. Regulation (EC) No 1907/2006 (Annex IX, sect. 9.3.2, column 2) states as follows:

"The study need not be conducted if:

- the substance has a low potential for bioaccumulation (for instance a log Kow <= 3) and/or a low potential to cross biological membranes, or

- direct and indirect exposure of the aquatic environment is unlikely.”

Abiotic degradation study on the test item shows that the test item degradates in contact with water (hydrolysis). In the course of the hydrolysis of the test item the intermediate degradation products 2,4-dichlor-6-hydroxy-1,3,5-triazine (first intermediate) and 2-chlor-4,6-dihydroxy-1,3,5-triazine (also named 6-chloro-1,3,5-triazine-2,4(1H,3H)-dione, sodium salt) (second intermediate) occur that in turn will be further hydrolysed to cyanuric acid. Therefore, the direct and indirect exposure of the test item to water is highly unlikely.

Further, using EPIWIN 4.1 software and the ACD/Log D Suite program for cyanuric chloride a bioconcentration factor (BCF) of 0.293 L/Kg wwt and a partition coefficient (n-octanol/water) log Kow of 2.14 were calculated, respectively. Additionally using the EPIWEB KOCWIN v2.00 software Log Koc of the degradation product cyanuric acid was calculated to be 1.902.

These experimental data and the theoretical calculations do not indicate a potential of the test item and its degradation product for bioaccumulation.