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Sediment toxicity

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Fatty acids, C14-18 and C16-18-unsatd., zinc salts:

Sediment toxicity studies of Fatty acids, C14-18 and C16-18-unsatd., zinc salts are not available. Thus, read-across to the assessment entities soluble zinc substances and C14-18 fatty acids is applied, since zinc cations and fatty acid anions determine its fate and toxicity in the environment. Since C14-18-satd. and C16-18-unsatd. fatty acids have a low potential for sediment toxicity, the sediment hazard assessment of Fatty acids, C14-18 and C16-18-unsatd., zinc salt is based on zinc ions. Please refer to the endpoint summary of the respective assessment entity for further details.


Fatty acid anions (C14-18-satd. and C16-18-unsatd.):

Fatty acids as contained in plant and animal tissue are a natural component of sediments, represent a significant part of the nutritional demands of living organisms, are rapidly degraded and non-bioaccumulative and have a low toxic potential in sediment.



Reliable data are available for 7 freshwater species with species mean NOECs (added - after correction for background) ranging from 146 to 1101 mg/kg dw. In addition, two field studies are available for freshwater sediments resulting in an overall NOECecosystem of 725 mg/kg d.w. added zinc and minor effects on species richness and macroinvertebrate density at 119 mg/kg d.w. added zinc.

Chronic toxicity data are available for 2 marine species: the amphipod Melita plumulosa with a NOEC (added) of 490 mg/kg dw for reproduction and the mangrove Avicennia marina with a NOEC (added) of 207.1 mg/kg dw for emergence.

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