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Physical & Chemical properties

Water solubility

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Description of key information

The solubility of charcoal was determined by the column method according to EU method A.6. and under GLP compliance.
Therefore, the test item charcoal was filled in a HPLC-column and was eluted in a first experiment with a flow rate of 24.68 mL/h.
A second run with a flow rate of 12.64 mL/h was performed likewise.
Collected fractions were analysed using a carbon analyser.

Key value for chemical safety assessment

Additional information

For the determination of the water solubility of charcoal, three different charcoal probes were tested: Probe 1-3 (C-Fix = 73.3, 80.5, 88.7%). Due to the low solubility of charcaol, the column elution method according to EU method A.6 was performed. Therefore, the test item charcoal was filled in a HPLC-column and was eluted in two different runs with different flow rates.

The total carbon (TC) of each fraction was measured and the concentration of the test item in each fraction was calculated from the measured TC value and the TC of the test item (determined by elementary analysis).

For charcoal Probe 1 and 3, the measured TC-values were below the limit of quantification. Both charcoal probes showed mean values of TC content <1.0 mg/L, but above the limit of detection (LOD = 0.5 mg/L). Therefore the water solubility of charcoal Probe 1 and 3 (C-Fix = 73.3, 88,7%) is stated as <1 mg/L (21,3 and 22.5°C).

For charcoal (Probe 2: C-Fix = 80.5%) all measurements at both flow rates resulted in TC values above the limit of quantification (LOQ) of TC. Independency of flow rate and solubility was given.

The concentration of charcoal (Probe 2: C-Fix = 80.5%) the solubility in water was calculated as:


4.60±0.48 mg/L at 22.4 ± 0.2oC.

4.60 x 10 -3 kg/m3 (SI units)