Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Apart from industrial production, it has to be underlined that heptan-1-ol is a natural product found in plants, meats, fruits, vegetables and even in the expired air of healthy, unexposed people.

When released in water

If released into water, heptan-1-ol is not expected to adsorb to suspended solids and sediment due to its low potential of adsorption (log Kow = 2.2; Gancet, 2009). Volatilization from water surfaces is expected to be an significant fate process based upon this compound's Henry's Law constant. Estimated volatilization half-lives for a model river and model lake are 2.2 days and 20 days, respectively. On the opposite, hydrolysis is not expected to be an important environmental fate process since this compound lacks functional groups that hydrolyze under environmental conditions. The hydrolysis as a function of pH of the test item n-heptanol was assessed according to the OECD guideline 111. The preliminary test showed that the item was stable at pH 4, 7 and 9 at 50 +1- 0.5 °C. No decomposition products could be detected by the analysis and less than 10% was hydrolyzed after five days for each of the three buffers. As a consequence, heptan-1-ol can be considered as stable under the tested conditions (pH = 4, 7 and 9).

The ready biodegradability of heptan-1-ol was evaluated in a study (Gancet, 2011) performed in accordance with OECD testing guideline 301 F and GLP requirements. According to these results, heptanol is considered as readily biodegradable.

When released in soil/sediments

Heptan-1-ol is characterized by a low potential of adsorption based on its log Kow value of 2.2 (Gancet, 2009). As a consequence, it is expected that it has a high mobility in soil and sediments compartments. In accordance with column 2 of REACH Annex IX, the adsorption/desorption screening test does not need to be conducted as the substance can be expected to have a low potential for adsorption based on its intrinsic properties (log Kow = 2.2). Nevertheless, an experimental data was available, so it is recorded. This data comes to reinforce that heptan-1-ol will not adsorb on soil and sediments particulate matters. Actually, log Koc value was estimated at 1.66.

Besides, it as been demonstrated that heptan-1-ol is readily biodegradable. As a consequence, soil and sediment compartments are not considered as target compartments for heptan-1 -ol. Thus, no further tests are proposed.

Heptan1-1-ol is expected to have a high mobility in soil and sediments and its identified target compartment will be the atmospheric compartment due to volatilization from water.