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EC number: 266-936-9 | CAS number: 67701-12-6 This substance is identified by SDA Substance Name: C14-C18 and C16-C18 unsaturated alkyl carboxylic acid zinc salt and SDA Reporting Number: 04-006-09.
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

Water solubility
Administrative data
Link to relevant study record(s)
- Endpoint:
- water solubility
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 03-06-2010 to 23-06-2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 105 (Water Solubility)
- Version / remarks:
- 1995
- Deviations:
- yes
- Remarks:
- Two vessels were set up in a parallel design at 21 °C ± 1.0 °C instead of 20 ± 1.0 °C. Each vessel had to be sampled several times instead of sampling one vessel at every point in time. This modification helped to avoid weighing errors.
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.6 (Water Solubility)
- Version / remarks:
- 2008
- Deviations:
- yes
- Remarks:
- Two vessels were set up in a parallel design at 21 °C ± 1.0 °C instead of 20 ± 1.0 °C. Each vessel had to be sampled several times instead of sampling one vessel at every point in time. This modification helped to avoid weighing errors.
- Principles of method if other than guideline:
- An objective of the column elution method is to increase the surface of the test item to improve the contact with the eluent. This is mostly applicable for organic compounds. In case of metal compounds, the surface cannot be increased by using the column elution method. Thus, the flask method was applied to determine the water solubility of this test item.
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- signed 2007-03-21
- Type of method:
- flask method
- Water solubility:
- 214 µg/L
- Conc. based on:
- element
- Remarks:
- dissolved zinc
- Loading of aqueous phase:
- 30 mg/L
- Incubation duration:
- >= 18 - <= 20 d
- Temp.:
- 21 °C
- pH:
- >= 5.7 - <= 6
- Remarks on result:
- other: SD =± 10 µg/L
- Conclusions:
- In a water solubility test (OECD TG 105) with Fatty acids, C14-18 and C16-18-unsatd., zinc salts, the mean dissolved zinc concentration after 18-20 days was determined with 214 ± 10 µg/L at pH 5.7 - 6.0 and 21.0 ± 1.0 °C.
- Endpoint:
- transformation / dissolution of metals and inorganic metal compounds
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 2009-12-15 to 2010-05-03
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Series on Testing and Assessment No. 29 (23-Jul-2001): Guidance document on transformation/dissolution of metals and metal compounds in aqueous media
- Version / remarks:
- 2001
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- signed 2007-03-21
- Type of method:
- flask method
- Specific details on test material used for the study:
- - Name of test material (as cited in study report): Zincum SW/F
- Molecular formula: (C16H31O2)2Zn (27.4 %), (C18H35O2)2Zn (67.1 %)
- Molecular weight: (C16H31O2)2Zn 576.22 g/mol, (C18H35O2) 2Zn 632.33 g/mol
- Physical state: solid, white powder - Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- >= 0.017 - <= 0.023 mg/L
- Element analysed:
- Zn
- Loading of aqueous phase:
- 1 mg/L
- Incubation duration:
- 7 d
- Test conditions:
- Temp: 21.5 °C, pH: >= 7.8 - <=8.2, modified ISO 6341 media
- Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- >= 0.082 - <= 0.098 mg/L
- Element analysed:
- Zn
- Loading of aqueous phase:
- 10 mg/L
- Incubation duration:
- 7 d
- Test conditions:
- Temp: 21.5 °C, pH: >= 7.8 - <=8.2, modified ISO 6341 media
- Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- >= 0.362 - <= 0.376 mg/L
- Element analysed:
- Zn
- Loading of aqueous phase:
- 100 mg/L
- Incubation duration:
- 7 d
- Test conditions:
- Temp: 21.5 °C, pH: >= 7.8 - <=8.2, modified ISO 6341 media
- Type of test:
- full transformation/dissolution test - metals and sparingly soluble metal compounds
- Mean dissolved conc.:
- >= 0.025 - <= 0.033 mg/L
- Element analysed:
- Zn
- Loading of aqueous phase:
- 1 mg/L
- Incubation duration:
- 28 d
- Test conditions:
- Temp: 21.5 °C, pH: >= 7.8 - <=8.2, modified ISO 6341 media
- Conclusions:
- Interpretation of results: slightly soluble (0.1-100 mg/L) at pH 8 (pH that maximises dissolution)
In the full T/D test, the maximum solubility resulted in 0.029 ± 0.004 mg/L dissolved zinc (28 %) at the 1 mg/L loading after 28 days, and in 0.090 ± 0.008 mg/L (8.9 %) and 0.369 ± 0.007 mg/L (3.7 %) at the 10 mg/L and 100 mg/L loading, respectively, after 7 days in modified ISO 6341 media at pH 8.
Referenceopen allclose all
Observations
During the study, the test media were slightly turbid and undissolved test material was observed on the surface of the media. Furthermore, coarse material was adsorbed to the flask wall. After filtration, the solution was clear. In order to verify this, the turbidity was measured in the supernatant.
After adding the test substance, no distinct effect on pHs of all loaded test media was observed. The temperature in the test vessels ranged from 20.8 – 22.0 °C.
pH values
The pH of test solutions and blanks were measured after 15 days and then every 24 h before sampling until test end. No explicit difference between the pH values of method blanks and media loaded with the test item was observed. All measured pH values are listed in the following tables.
Table: pH values of method blanks
stirring time [d] |
blank vessel |
temperature of pH measurement [°C] |
pH |
blank vessel |
temperature of pH measurement [°C] |
pH |
15 |
A |
21.1 |
5.8 |
B |
21.1 |
5.8 |
16 |
A |
20.9 |
5.7 |
B |
20.8 |
5.7 |
17 |
A |
22.0 |
6.0 |
B |
21.7 |
5.9 |
18 |
A |
21.3 |
5.8 |
B |
21.6 |
5.8 |
19 |
A |
21.6 |
5.9 |
B |
21.6 |
5.9 |
20 |
A |
21.9 |
5.9 |
B |
21.9 |
5.9 |
Table: pH values of Struktol A 50 P test-solutions
stirring time [d] |
blank vessel |
temperature of pH measurement [°C] |
pH |
blank vessel |
temperature of pH measurement [°C] |
pH |
15 |
A |
21.0 |
5.8 |
B |
21.0 |
6.0 |
16 |
A |
20.8 |
5.8 |
B |
20.9 |
5.9 |
17 |
A |
21.9 |
6.0 |
B |
21.9 |
6.0 |
18 |
A |
21.5 |
5.9 |
B |
21.6 |
6.0 |
19 |
A |
21.5 |
6.0 |
B |
21.4 |
6.0 |
20 |
A |
21.7 |
6.0 |
B |
21.8 |
6.0 |
Turbidity measurements
The turbidity was measured after filtering to verify that only dissolved zinc concentrations would get measured. The turbidity was always 0.02 NTU, indicating that no undissolved material was left after the filtration. The data of the measurements are compiled in the following Tables.
Table: Turbidity measurements of blanks
stirring time [d] |
turbidity of sample blank vessel A [NTU] |
turbidity of sample blank vessel B [NTU] |
15 |
0.02 |
0.02 |
16 |
0.02 |
0.02 |
17 |
0.02 |
0.02 |
18 |
0.02 |
0.02 |
19 |
0.02 |
0.02 |
20 |
0.02 |
0.02 |
Table: Turbidity measurements of samples
stirring time [d] |
turbidity of sample sample vessel A [NTU] |
turbidity of sample sample vessel B [NTU] |
15 |
0.02 |
0.02 |
16 |
0.02 |
0.02 |
17 |
0.02 |
0.02 |
18 |
0.02 |
0.02 |
19 |
0.02 |
0.02 |
20 |
0.02 |
0.02 |
ICP-OES measurement
Zinc levels of all method blanks from the test were below the respective LODs of 2.8 and 4.7 µg/L. All samples were analyzed within one week.
Table: Measured zinc concentrations in method blank samples
stirring time [d] |
mean Zn conc. blank A [µg/L] |
mean Zn conc. blank B [µg/L] |
LOD |
LOQ |
15 |
< LOD |
< LOD |
4.7 |
16 |
16 |
< LOD |
< LOD |
4.7 |
16 |
17 |
< LOD |
< LOD |
4.7 |
16 |
18 |
< LOD |
< LOD |
4.7 |
16 |
19 |
< LOD |
< LOD |
2.8 |
9.4 |
20 |
< LOD |
< LOD |
2.8 |
9.4 |
Table: Measured zinc concentrations in test samples
stirring time [d] |
Zn conc. of samples |
mean Zn |
Zn conc. of samples |
mean Zn |
mean Zn |
|
15 |
141 |
169 ± 24 |
132 |
158 ± 23 |
162 ± 22 |
- |
183 |
171 |
|||||
183 |
173 |
|||||
16 |
144 |
177 ± 29 |
125 |
163± 33 |
170 ± 10 |
+ 5.1 |
193 |
182 |
|||||
195 |
183 |
|||||
17 |
163 |
196 ± 29 |
184 |
211± 24 |
203 ± 10 |
+ 19 |
208 |
222 |
|||||
217 |
226 |
|||||
18 |
180 |
209 ± 25 |
159 |
196 ± 32 |
202 ± 9.4 |
- 0.6 |
222 |
215 |
|||||
224 |
213 |
|||||
19 |
196 |
225 ± 25 |
184 |
211 ± 24 |
218 ± 10 |
+ 7.8 |
239 |
222 |
|||||
239 |
226 |
|||||
20 |
183 |
228 ± 39 |
178 |
216 ± 33 |
220 ± 8.9 |
+ 2.0 |
250 |
235 |
|||||
252 |
234 |
# calculation of mean and standard deviation from mean Zn concentrations of vessel A and B
Under the described conditions, the highest dissolved zinc concentrations at 21.5 ± 1.5 °C were measured in solutions at pH 8.0 ± 0.2. At a loading of 100 mg/L in the screening/pH optimisation test, the maximum solubility of the test item Zincum SW/F with a calculated zinc content of 10.05 % resulted in a zinc concentration of 0.284 ± 0.002 mg/L after 24 h corresponding to a dissolved zinc amount of 2.9 %. In the full T/D test, the maximum solubility resulted in 0.029 ± 0.004 mg/L dissolved zinc (28 %) at the 1 mg/L loading after 28 days, and in 0.090 ± 0.008 mg/L (8.9 %) and 0.369 ± 0.007 mg/L (3.7 %) at the 10 mg/L and 100 mg/L loading, respectively, after 7 days.
Description of key information
In a water solubility test (OECD TG 105) with Fatty acids, C14-18 and C16-18-unsatd., zinc salts, the mean dissolved zinc concentration after 18-20 days was determined with 214 µg/L at pH 5.7 - 6.0 and 21°C .
Transformation / dissolution of of a structural analogue with a similar water solubility (i.e. Fatty acids, C16-18, zinc salts: up to 180 µg Zn/L) at pH 8 (the pH that maximises dissolution) resulted in the following dissolved zinc concentrations in modified ISO 6341 media:
Loading 1 mg/L: after 7 days: 19 ug Zn/L; after 28 days: 29 ug Zn/L
Loading 10 mg/L: after 7 days: 90 ug Zn/L
Loading 100 mg/L: after 7 days: 369 ug Zn/L
These transformation/dissolution data are considered representative of transformation/ dissolution of Fatty acids, C14-18 and C16-18-unsatd., zinc salts based on a similar water solubility and zinc content (i.e. 10 %). Nevertheless, confirmatory transformation/dissolution testing of Fatty acids, C14-18 and C16-18 unsatd., zinc salts (i.e., finest material as put on the market) in environmental media according to OECD Series #29 (2001) is planned by the of Zinc Metallic Soaps Consortium. The hazard assessment of Fatty acids, C14-18 and C16-18 unsatd., zinc salts will be updated accordingly upon finalisation of the study.
Key value for chemical safety assessment
Additional information
The solubility of Fatty acids, C14-18 and C16-18-unsatd., zinc salts depends on several factors, including loading, solution matrix (pH, ionic strength, other salts) and exposure time.
Value used for CSA: 214 µg/L dissolved zinc
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