Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

No terrestrial toxicity studies have been performed, despite the fact that half of the TGIC reaching the environment goes to soil according to the fugacity model used.

Only limited ecotoxicological data for TGIC are available. The 96 h LC50 obtained in static studies on zebra fish (Brachydanio rerio) exceeded 77 mg/L (average of measured concentrations at 0 and 96 h), as did the NOEC. The 24 h EC50 in a static Daphnia magna immobilisation test was above 100 mg/L, with a NOEC of 58 mg/L. The 72-hour EbC50 for algae (Scenedesmus subspicatus) is 29 mg/l, and the NOEC is 6.3 mg/l.

Environmental exposure to TGIC is expected to be minimal as dust extractors and other pollution control devices will remove particulate waste for disposal. TGIC contained in such waste will be effectively immobile after consignment to landfill, particularly if waste powder is heat cured beforehand. Any residues which remain free and enter the open environment will have limited persistence because of the lability of the epoxide substituents (NICNAS (1994) Priority Existing Chemical No. 1- Triglycidyl Isocyanurate,

full public report, National Industrial Chemicals Notification and Assessment Scheme. Canberra, Australian Government Publishing Service, April)

Based on these facts and considering the low exposure in the environment, no tests with terrestrial organisms have been conducted. The above results indicate that TGIC is, at most, slightly toxic to aquatic fauna under conditions of acute exposure. Chronic effects would not be expected because of limited persistence, both in water as well as in soil. .