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Toxicity to aquatic algae and cyanobacteria

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The test material is a dark coloured dye which when mixed in test medium will impart dark colour. Due to light absorption, coloured substances such as dyes can inhibit algal growth, which is not the result of a toxic action. This shading effect can confound measures of chemical toxicity and thus impair the risk assessment. In an effort to avoid this problem Lemna gibba (Duckweed) Growth Inhibition test (static) was conducted.

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