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EC number: 201-857-5 | CAS number: 88-75-5
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Acutely very toxic to aquatic algae.
Key value for chemical safety assessment
Additional information
Data on short-term toxicity to aquatic algae are available in the WHO Concise International Chemical Assessment Document 20 (CICAD) on Mononitrophenols (2000), the BUA report 75 for 2- and 4-nitrophenol (1992; update supplementary report 2003) and the ECB IUCLID (2000) for 2-nitrophenol. The most sensitive value is given for Scenedesmus subspicatus tested in a chronic cell multiplication inhibition test (according to UBA guideline of 1982). The EC50 after 96 h was determined to be 0.39 mg/L (EC10 after 96 h = 0.01 mg/L). However, a second study with Scenedesmus subspicatus tested in the chronic cell multiplication inhibition test (according to UBA guideline of 1982) gave an EC50 value after 168 h of 8.4 mg/L and an EC10 of 1.4 mg/L. Further data are given for acute toxicity to algae. The EC50 values range between 1.53 and 6.8 mg/L with different species and exposure periods. Nevertheless, due to responsibe care reasons, 2-nitrophenol is regarded as acutely very toxic to aquatic algae.
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