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Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
1.12 µg/L
Assessment factor:
50
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
11.6 µg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.112 µg/L
Assessment factor:
500
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
204 µg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
no exposure of sediment expected

Sediment (marine water)

Hazard assessment conclusion:
no exposure of sediment expected

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
no exposure of soil expected

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

For the relevant tonnage band studies on aquatic an terrestrial toxicity were necessary. Additional information on sediment toxicity are available (EFSA report 296 (2009)), 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)= 9.18 mg/L); NOEC (3 h): 2.04 mg/L).

 

For earthworms (Eisenia foetida) only low toxicity was found (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 indicating a low risk to non-target organisms.

Conclusion on classification

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.