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Toxicity to aquatic algae and cyanobacteria

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The toxicity of Boron to Spirodella polyrrhiza was determined by Davis et al. 2002 using standard methods. Frond production is apparently a more sensitive endpoint than either growth rate or the presence of abnormal fronds. Frond production in S. polyrrhiza was significantly reduced at 3.55 mg B/l. Significant reductions in growth rate and the percentage of abnormal (chlorotic, necrotic, and dead) fronds were observed at 18.9 and 22.4 mg B/l, respectively. The EC50for frond production, frond growth rate, and abnormal fronds were 14.3, 11.7, and 17.7 mg B/1, respectively. Davis et al. (2002) reported a NOEC value of 6.1 mg- B/L for the duckweed Spirodella polyrhiza. They reported endogenous boron level of 0.9 mg- B/L from the various nutrient media used.

Another non published data, an OECD 201 study of Selenastrum capricornutum (Hanstveit and Oldersma 2000) reported a NOEC concentration of 17.5 mg-B/L..

Other studies reported NOEC values were obatined for Chlorella pyrenoidosa (10 mg-B/L), Scenedesmus subspicatus (24 mg-B/L), Anacystis nidulans (50 mg-B/L) and Lemna minor (60 mg-B/L) are also available.