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Toxicity to aquatic algae and cyanobacteria

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Description of key information

With high probability acutely not harmful to aquatic algae.

Key value for chemical safety assessment

Additional information

The acute toxicity of 2 -morpholinoethanol (CAS 622 -40 -2) was assessed via a read-across approach since no experimental data are available for this substance. Test data for aquatic green algae were taken from studies with other N-substituted morpholine structures. All studies are reliable with restrictions since no chemical verification of the test item concentrations was performed.

The following data were used:

- 4 -Ethylmorpholine (CAS 100 -74 -3): 72 -h ErC50 = 580 mg/L (DIN 38412, Part 9; Desmodesmus subspicatus; BASF AG 1989; Study No. 01/89/0733)

- 4 -Methylmorpholine (CAS 109 -02 -4): 72 -h EC50 = 802 mg/L (Hüls, 1992, cited in KBwS, 1992; Sheet no. 763)

- 4 -Morpholinecarbaldehyde (CAS 4394 -85 -8): 72-h ErC50 = 23880 mg/L (DIN 38412, Part 9; Desmodesmus subspicatus; BASF AG 1990; Study No. 01/90/143)

Taking these values, it can be concluded that 2 -morpholinoethanol is acutely not harmful to aquatic algae with a high probability.