“…A decrease in optical density (at 670 nm) is an index of algal growth inhibition caused by toxins. The test adheres to OECD and ISO Guidelines (available at: https://www.microbiotests.com/toxkit/freshwateralgae-toxicity-test-with-algaltoxkit-f/) (Vandenbroele et al 2000, Wielen van der and Halleux 2000, Lucivjanska et al 2000, Daniel et al 2004, Baudo et al 2004, Moser et al 2009.…”