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Environmental fate & pathways

Hydrolysis

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Description of key information

The hydrolysis study of the test item is not feasible with respect to the OECD Guideline 111, due to insolubility of the test item at test conditions. A slight hydrolysis of the undisolved test item was observed at pH 9. 

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Additional information

Prior to the testing of hydrolysis as function of pH of the test item solubility testing was performed with buffer solutions at pH 4, 7 and 9.

 

Analysis of the test item were performed by spectroscopic determination of aluminium after reaction with Eriochromcyanin R, employing a readily available cuvette test.

 

The test item was incubated at room temperature for approx. 16 h (overnight). No aluminium could be detected at the pH levels 4 and 7 since the test item dissolved an amount less than 0.02 mg/L which is the detection limit of the analytical method. At pH 9, a small amount of the test item dissolved at room temperature. Since the test item ia an inorganic salt, it is supposed to dissociate in buffered solution, however, the solvation seems to be depending on the pH value. Analysis by the cuvette test showed an aluminium content of 1.8 mg/L at pH 9 which corresponds to a transformation of approx. 8 % of the applied test item. Based on the chemical properties of dissolved aluminium salts in water, as reported in literature (e.g. Holleman-Wilberg, “Inorganic Chemistry”, First English edition, Academic Press, de Gruyter, 2001), it was assumed that the hydrolysis at pH 9 could be interpreted as formation of the aqua-hydroxo-aluminate complex ion.

 

As the test item itself is not soluble at the test conditions without hydrolysis, the principles of the OECD guideline 111 could not be applied for the test item and no further testing could be performed.