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 (Z)-N-octadec-9-enylhexadecan-1-amide (CAS No. 16260-09-6) is stable in water; hydrolysis is not expected to be an important process in the fate of (Z)-N-octadec-9-enylhexadecan-1-amide (CAS No. 16260-09-6).

The substance is not readily biodegradable. Nonetheless, biodegradability properties of (Z)-N-octadec-9-enylhexadecan-1-amide (CAS No. 16260-09-6) has been investigated, following the request from ECHA, by performing simulation tests as followed:

Sediment simulation testing (OECD 308, at 12 °C) and

Soil simulation testing (OECD 307, at 12 °C).


Both studies conclude that there is biodegradation in both soil and water/sediment system with a half-life of 25.2 days, with final mineralization range of 42% at 105 days (Calwich Abbey Lake) and 40.6% at 105 days (Emperor Lake), in the water sediment/system and a half-life of 226 days to 418 days, with final mineralization range from 8.5% at 120 days (Kennett soil) to 15.4% at 120 days (South Witham soil), in the four soils under aerobic conditions. The substance is therefore very persistent in sediment and in soil.

Biomagnification of the substance through the food chain has been investigated in an OECD 305 test (GLP, dietary exposure). Dietary exposure is considered being the most relevant exposure pathway based on the poor water solubility and high adsorption potential of the substance. The study is currently ongoing. 

However, BCF values calculated by Arnot Gobas equation are available as supporting studies. Calculation based on BCFBAF v3.01, regression based, BCF is 3.47 L/kg whole body w.w. and 0.89 L/kg w.w. (including biotransformation rate).

Thus, it is expected that the substance undergoes a rapid elimination from the fish’s tissue. Therefore it is not expected that the substance accumulates in the food chain.