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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The no observed effect concentration (NOEC) value of phthalylsulfathiazole in green algae (Pseudokirchnerella subcapitata) in a 72 hr study on growth effect was estimated to be 2.589638 mg/L.

Key value for chemical safety assessment

EC50/LC50 for freshwater algae:
19.334 mg/L
EC10, LC10 or NOEC for freshwater algae:
2.59 mg/L

Additional information

The no observed effect concentration (NOEC) value of phthalylsulfathiazole in green algae (Pseudokirchnerella subcapitata) in a 72 hr study on growth effect was estimated to be 2.589638 mg/L. It is concluded that phthalylsulfathiazole exhibit short term toxicity to green algae (Pseudokirchnerella subcapitata) in category 3.

Sr no

Endpoint Value Unit Species
 1  NOEC  2.589638  mg/l Pseudokirchnerella subcapitata
2  EC50  19.3344  mg/l Pseudokirchnerella subcapitata
 3  EC50  14.59537  mg/l  Pseudokirchnerella subcapitata

 

Based on the above the endpoint values and considering the CLP Criteria for aquatic classification it can be concluded that the substance phthalylsulfathiazole exhibit short term toxicity to aquatic algae (Pseudokirchnerella subcapitata) in category 3