In the leather industry, nonylphenol ethoxylate and octylphenol ethoxylate are used as non-ionic surfactants. These release nonylphenol and octylphenol during biodegradation. The release of these alkylphenols (especially the more ecotoxic nonylphenol) into the environment should be avoided because nonylphenol is a hormonally acting substance and toxic to aquatic organisms.
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