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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The ErC50 of FAT 36038/J TE observed for test period of 72-hour for freshwater alga (Pseudokirchneriella subcapitata) was calculated as 0.16 mg/L. 
The EyC50 of FAT 36038/J TE bserved for a test period of 72-hour for freshwater alga (Pseudokirchneriella subcapitata) was calculated as 0.29 mg/L.

Key value for chemical safety assessment

EC50 for freshwater algae:
0.16 mg/L
EC10 or NOEC for freshwater algae:
0.001 mg/L

Additional information

A key study was performed to determine growth Inhibition in Freshwater green Algae (Pseudokirchneriella subcapitata) in accordance with OECD-201 guideline with FAT 36038/J TE. The test concentrations were selected as 0.0008, 0.003, 0.008, 0.03, 0.09, 0.28 and 0.88 mg/L.

At the end of 72 hr exposure time the following results were observed:

Average Specific Growth Rate:

The percent inhibition on the average growth rate at the end of 72 hour was 0.17 %, 11.36 %, 11.77 %, 26.96 %, 51.63 %, 56.31 and 68.14 % in test concentration of 0.0008, 0.003, 0.008, 0.03, 0.09, 0.28 and 0.88 mg/L respectively.

From the average specific growth rate recorded with the different test concentrations viz.,0.0008, 0.003, 0.008, 0.03, 0.09, 0.28 and 0.88 mg/L the concentration that inhibited 50% growth (ErC50) of Freshwater green Algae (Pseudokirchneriella subcapitata) was calculated as 0.16 mg/L.

The no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC) were recorded to be 0.0008 mg/L and 0.003 mg/L respectively.

Yield:

The percent inhibition on the yield at the end of 72 hour was 0.04 %, 5.20 %, 6.15 %, 20.32 % 31.16 %, 43.23 and 70.79 % in test concentrations 0.0008, 0.003, 0.008, 0.03, 0.09, 0.28 and 0.88 mg/L respectively.

From the yield recorded with the different test concentrations viz.,0.0008, 0.003, 0.008, 0.03, 0.09, 0.28 and 0.88 mg/L, the concentration that inhibited 50 % growth (EyC50) of Freshwater green Algae (Pseudokirchneriella subcapitata) was calculated as 0.29 mg/L.

The no observed effect concentration (NOEC) and lowest observed effect concentration (LOEC) were calculated as 0.0008 mg/L and 0.003 mg/L respectively