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EC number: 205-087-0
CAS number: 133-06-2
For the relevant tonnage band studies on aquatic an terrestrial toxicity were necessary. Additional information on sediment toxicity are available (EFSA report (July 2020)), as captan is used as active ingredient in plant protection products.
Captan is acute toxic in aquatic systems with the most sensitive species fish (Salmo trutta LC50 (96 h) = 0,093 mg/L; Oncorhynchus mykiss NOEC(21d) = 0.056mg/l)) leading to classification as acute toxic in aquatic systems category 1 (H400) according to Annex 1, Chapter 4 of regulation 1272/2008.
For algae based on biomass low toxicity was observed (Pseudokirchnerella subcapitata EC50 (96 h): 1.6 mg/L; NOEC (96 h): 0.2 mg/L). Even for invertebrates low toxicity was found (Daphnia magna EC50 (48 h)> 7.1 mg/L; NOEC (21 d) = 0.56 mg/L). The effects on aquatic microorganisms are comparable to algae and invertebrate results (STP EC50 (3 h)= 8.2 mg/L); NOEC (3 h): 0.64 mg/L).
For springtails (Collembola, Isotomidae) only low soil toxicity was found (NOEC (28 d) = 177 mg/kg soil dw, EC50 (median effect concentration) = 807.9 mg a.i./kg soil), either for earthworms (Eisenia foetida, LC50 (14 d) >519 mg/kg soil dw). Also for bees LD50 was not reached in a range up to 100 µg captan/bee.
The EC50 and EC10 of captan to soil microorganisms (Pseudomonas putida), was 0.22 and 0.07 mg/L (in water), respectively.
No phytotoxic effects were observed in a test with 6 different crop plants (including both monocotyledon and dicotyledon plant species) at dose rates of 1.92 kg captan/ha (21 d) indicating a low risk to non-target organisms.
According to long-term studies on fish with LC50 values of 75 µg/L captan has to be classified as acute toxic category 1 (H400) in aquatic systems according to annex I, chapter 4 ff regulation 1272/2008.
Due to fast hydrolysis in aquatic systems no classification in respect to chronic aquatic toxicity is applicable. Main hydrolysis products (carbon dioxide, THPI) are not classified as being hazardous.
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