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Fatty acids, C16-18, zinc salts:

Based on two studies applied in a weight-of-evidence approach, observed toxicity of fatty acids, C16-18, zinc salts to bacteria is above the water solubility limit of around 1 mg/L. A similar conclusion was made in the EU RAR Zinc distearate (CAS-No.: 557-05-1 & 91051-01-3 EINECS-No.: 209-151-9 & 293-049-4) Part 1 - Environment (Final report R074_0805_env, May 2008) as follows: "The two available tests with bacteria resulted in NOEC values of 1000 mg zinc distearate/L (Berger, 1995b: Pseudomonas putida) and 1560 mg zinc distearate/L (TÜV, 1992: Microtoxtest according to DIN 38412, part 34). In the latter study an EC20 of 6250 mg zinc distearate /L was calculated, with the remark that an EC50 could not be derived because of the low effect response. These nominal concentrations are at least 3 orders of magnitude higher than the water solubility limit for zinc distearate (around 1 mg/L)."

Fatty acids, C16 -18, zinc salts are readily biodegradable (93% in 28 days, TÜV, 1992; 71% in 28d, Rudolf, 1992) and are not expected to persist in the environment. Thus, Fatty acids, C16-18, zinc salts are expected to have a low potential for toxicity to aquatic microorganisms.

However, for the environmental hazard assessment and making use of the extensive dataset available on zinc toxicity, read-across to the assessment entities soluble zinc substances and C16-18 fatty acids is applied since zinc cations and fatty acid anions (C16-18) determine fate and toxicity in the environment. Since C16 -18 fatty acids have a low potential for sediment toxicity, the sediment hazard assessment of fatty acids, C16-18, zinc saltis based on zinc ions. Please refer to the endpoint summary of the respective assessment entityfor further details.

Fatty acid anions (C16-18):

Fatty acids as contained in plant and animal tissue are a natural component of aquatic systems, are rapidly degraded and non-bioaccumulative and have a low potential for toxicity to aquatic microorganisms.

Zinc:

A NOEC of 0.1 mg Zn/L is reported for nitrification inhibition.

Key value for chemical safety assessment

Additional information