Registration Dossier
Registration Dossier
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EC number: 270-451-8 | CAS number: 68440-34-6
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Fatty acids, tallow, zinc salts:
0.034 to 0.214 mg/L dissolved zinc concentrations;
0.79 to 1.8 mg/L dissolved zinc distearate (CAS 557-05-1).
CAS No. 91051-01-3: 0.034 to 0.0608 mg/L at 30 °C (dissolved Zn)
CAS No. 557-05-1: 0.08 mg/L at 15 °C to 0.18 mg/L at 20 °C, pH = 7.3 (dissolved Zn)
CAS No. 67701-12-6: 0.214 mg/L at 21 °C, pH = 6 (dissolved Zn)
Key value for chemical safety assessment
Additional information
The water solubility of fatty acids, tallow, zinc salts (CAS-No. 68440-34-6) was determined in the weight of evidence approach, on the basis of results obtained for analogue substances with CAS Nos 67701-12-6, 557-05-1 and 91051-01-3.
The solubility of these substances depends on several factors, including loading, solution matrix (pH, ionic strength, other salts) and exposure time.
In water, solubility ranges from 0.79 (CAS No. 557-05-1 at 15 °C) to 1.8 mg/L (CAS No. 557-05-1 at 20 °C, pH = 7.3) depending on test conditions. These calculations assume 1:1 dissolution of zinc and zinc content of ca. 10%. However, as stearate concentrations have not been experimentally confirmed, it may be more appropriate to express the solubility in resulting dissolved Zn concentrations (0.08 to 0.18 mg/L). Dissolved Zn concentrations for CAS No. 67701-12-6 (0.214 mg/L at 21 °C, pH = 6) and CAS No. 91051-01-3 (0.034 to 0.0608 mg/L at 30 °C) were also reported.
In more complex media simulating environmental solutions, solubility resulted in 0.02 to 0.9 mg/L dissolved zinc depending on test conditions. The following dissolved zinc concentrations have been measured in three different studies:
Schäfers (2010), CAS No. 91051 -01 -3, guideline conform and under GLP:
ISO 6341 media at pH 8:
Loading 1 mg/L:
-after 7 days: 19 µg Zn/L
-after 28 days: 29 µg Zn/L
Loading 10 mg/L:
-after 7 days: 90 µg Zn/L
Loading 100 mg/L:
-after 7 days: 369 µg Zn/L
Bouwman (2003), CAS No. 557 -05 -1
ISO 6341 at pH 6:
Loading 100 mg/L:
-after 2 days: 208 µg Zn/L
ISO 6341 at pH 8
Loading 100 mg/L:
-after 2 days: 475 µg Zn/L
M7 at pH 6:
Loading 100 mg/L:
-after 2 days: 325 µg Zn/L
M7 at pH 8
Loading 100 mg/L:
-after 2 days: 900 µg Zn/L
Bowmer (2001), CAS No. 557 -05 -1
Modified ISO 6341 at pH 6.75:
Loading 10 mg/L:
-after 4 days: 241 µg Zn/L
Modified ISO 6341 at pH 6.75
Loading 100 mg/L:
-after 4 days: 431 µg Zn/L)
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