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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Data waiving:
study technically not feasible
Justification for data waiving:
other:

Description of key information

Due to the ready hydrolysis of the test item, it would be expected to exist in the environment as its hydrolysis products; boric acid and 2-propyl heptan-1-ol. These components are already registered with partition coefficients available so it was considered that further testing with respect to these components was not required. For boric acid the typical Kp for soil is given as 2.19 L/kg (log Kp=0.34 L/kg) For 2-propyl heptan-1-ol Koc is given as 562.3 (Log Koc = 2.75) The substance is predicted to be mobile in soil.

Key value for chemical safety assessment

Koc at 20 °C:
562.3

Additional information

The test item could not be determined using a procedure designed to be compatible with either OECD Guideline No. 121 or EC Method C19. The test item is highly unstable in water and hydrolyses rapidly. The guidelines for the HPLC method state that the method is not applicable if the test item reacts with the mobile phase. The test item reacts with water and could potentially react with methanol as it is a protiotic solvent.

To assess the assumptions, test injections were performed. The assessment was carried out twice on separate days to confirm the observations. The parameters included:

Use of a commercially available cyanopropyl reverse phase HPLC column containing lipophilic and polar moieties

Mobile phase of methanol:water (55:45 v/v)

Gradient over 5 minutes starting at 30 minutes to 100% tetrahydrofuran

Primary detection by evaporative light scattering detector and additional check with a variable wavelength detector (210 nm).

The test item was nominally prepared at 1000 and 10000 mg/L in tetrahydrofuran (dried over anhydrous sodium sulphate)

No definitive peak(s) that represented the test item could be detected. The chromatography of the solvent blank and the test concentrations were essentially the same. The method could not be performed as the test item is decomposing before it could be analysed.

Due to the ready hydrolysis of the test item, it would be expected to exist in the environment as its hydrolysis products; boric acid and 2-propyl heptan-1-ol. These components are already registered with partition coefficients available so it was considered that further testing with respect to these components was not required. For boric acid the typical Kp for soil is given as 2.19 L/kg (log Kp=0.34 L/kg) For 2-propyl heptan-1-ol Koc is given as 562.3 (Log Koc = 2.75) The substance is predicted to be mobile in soil.

[LogKoc: 2.75]