Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

There are no standard ecotoxicological test results available for green liquor in soil.

Additional information

There are no ecotoxicological test results available for green liquor in soil. Instead, there are ecotoxicological data sets available of some of the individual constituents of GL. Depending of the ions/elements, these datasets can be very data-rich or scarce. Anyway these datasets can be applied in this hazard assessment context as a supportive read across information in combination to environmental fate information and known use and environmental exposure information.

If GL is discharged directly into the soil it can not only affect the soil organisms but also can influence soil functions. Adsorption of any of the GL constituents to soil is not known to be strong. GL constituents are hydrophilic and may therefore be very mobile in soil and can be almost readily eluted with the rainwater into the ground water. High alkalinity would heavily affect soil biota and soil composition. Remarkable GL discharges into soil might have also remarkable local consequences and therefore discharges should be considered with special care. It must also be pointed out, that all the GL constituents are known to be present in soil pore water naturally but as very dilute solutions.

Chemicals can reach the soil via several routes: application of sewage sludge in agriculture, direct application of chemicals and deposition from the atmosphere. Consequently the possibility of adverse effects has to be assessed. However, current information on the production and use of GL do not indicate that soil would be a target compartment for GL exposure. GL is not directly applied and its constituents adsorb poorly to sewage sludge. Hydrogen sulfide may be evaporated into air, but hardly precipitated to soil until it is oxidized in air to less toxic sulfate.

Testing soil compartment (Annex IX and X studies) is not regarded necessary. Based on the already existing exposure information, it is currently not seen necessary to conduct any targeted ecotoxicological testing of green liquor in soil. Regarding the effects assessment, it is possible to apply read across methods and tested aquatic effects data for soil compartment.