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 69. The 24 h EC50 in a static Daphnia magna immobilisation test was above 100 mg/L, with a NOEC of 58 mg/L 70. These 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 aquatic persistence.
While algal tests were not submitted, adverse effects are not expected because of very low environmental exposure and limited persistence of TGIC. TGIC shows some structural similarities to the triazine herbicide hexazinone, which is highly toxic to algae 71. While this allows prediction of certain environmental characteristics, such as soil mobility, it is probably not ecotoxicologically significant as hexazinone and other triazine herbicides characteristically carry amino substituents.
69. Ciba-Geigy Ltd 1988, Report on the Test for Acute Toxicity of TK 10622 to Zebra Fish (Brachydanio rerio). Ciba-Geigy Ltd, Basel, Switzerland.
70. Ciba-Geigy Ltd 1988, Report on the Test for Acute Toxicity of TK 10622 to Daphnia magna, Ciba-Geigy Ltd, Basel, Switzerland. March.
71. Fowler, M. C. 1977, Weed Research, vol. 17, pp. 191-195.
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