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Water solubility

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Description of key information

The water solubility could be considered as 100mg/L. The substance zinc methacrylate is demonstrated to readily dissolve into test medium at pH 6 and 8 within 12 h under 20°C and 200rpm agitation.

Key value for chemical safety assessment

Water solubility:
100 mg/L
at the temperature of:
20 °C

Additional information

A study was performed according to OECD 105 and EU Method A.6 using the flask method. In the pre-test visual observation showed undissolved particles at nominal concentration 1000 mg/L and equivocal results at nominal concentration 10 mg/L, therefore, AAS measurement of both filtrated (0.45 μm) solutions was performed after addition of 1 % KCl (10 % in water) and 1% HCl conc. Hence, solubility of the test item in water could be estimated as approx. 652 mg/L (from the nominal concentration of the test item in water 1000 mg/L). In the main study, the solubility of zinc methacrylate in water was determined from the measured concentrations of dissolved Zinc in the filtrated test solutions.

Equilibration time can be considered as approximately two days, as the values which were measured on the following consecutive days did not give significantly different values. The concentration of test item in water (based on measured dissolved Zinc concentrations) lay in the range 3.05 – 10.70 g/L for the nominal concentration range of the test item in water 3.5 – 12.0 g/L. 88 % of the test item was dissolved in water, calculated from the nominal concentration of the test item.

This study was considered reliable with restriction. Indeed, this study was showed that the limit of solubility of ZDMA could not be reached because of the dependency of solubility on amount of the test item.