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Physical & Chemical properties

Water solubility

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Description of key information

No exact value for the solubility of the test item in water can be stated.
At the plateau, the concentration of Tar wood in water lay in the range:
44 – 569 mg/L at 20.0 ± 0.5 °C = 4.4 – 56.9 * 10-2 kg/m3 (SI units)
for the following nominal concentration range of the test item in water: 52 – 1006 mg/L.
Therefore, 53 – 84 % of the test item was dissolved in water relating to the nominal concentration
of the test item.
As dissolved carbon as sum parameter for dissolved test item was measured, this study
cannot distinguish between water solubility and hydrolysis of the test item.

Key value for chemical safety assessment

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

Additional information

The solubility of the Tar wood in water was determined from the measured concentrations

of dissolved organic carbon (DOC) in the filtrated test solutions.

To determine the dependency of the water solubility on the amount of the test item added,

six different loading rates were chosen and the mixtures were shaken until equilibrium was

reached. Equilibration time in the main study can be considered as approx. nine days.

Dependency of solubility on amount of the test item (nominal load) was perceived. Therefore,

no exact value for the solubility of the test item in water can be stated. At the plateau,

the concentration of Tar wood in water lay in the range 43.5 – 568.7 mg/L for the nominal

concentration range of the test item in water 50 – 1000 mg/L. 53 – 84 % of the test item

was dissolved in water relating to the nominal concentration of the test item.

Dependency of pH value on amount of the test item (nominal load) was perceived, too.

No observations arousing doubts concerning the accuracy of the results and the validity of

the study were made.