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Water solubility

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Endpoint:
transformation / dissolution of metals and inorganic metal compounds
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Oct. 25, 2021 - Feb. 25, 2022; experimental phase: Oct. 27 - Dec. 20, 2021
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 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:
Jul. 23, 2001
Deviations:
yes
Remarks:
mass balance (%) was not performed during the full test for 1 mg/L as the determination was not precise
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Remarks:
measurement of Silicon and Aluminium per ICP-OES in aqueous media
Specific details on test material used for the study:
Name: Sodasil P-95
Batch no.: 937201AS_023301AS
CAS no.: 1344-00-9
Composition Silicic acid, aluminum sodium salt: 100%
Storage: room temperature (20 ± 5 °C)
Expiry date: 30. Jul. 2022
Stability: stable under storage conditions
Appearance: white powder
Purity: 100%
Homogeneity: homogeneous
Production date: 10. Sep. 2019
EC no.: 215-684-8
Molecular formula: nSiO2*mAl2O3*zNa2O
Molecular weight: unknown
Vapour pressure: 13.3 hPa at 1732 °C
Key result
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
64.7 µg/L
Element analysed:
silicon
Loading of aqueous phase:
1 mg/L
Incubation duration:
28 d
Key result
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
3.48 µg/L
Element analysed:
aluminium
Loading of aqueous phase:
1 mg/L
Incubation duration:
28 d
Details on results:
In this study, the maximum concentration of total dissolved Si and Al was determined in order to identify compounds of SODASIL P-95 which undergo either dissolution or rapid transformation.
The method validation of Si was performed during the study 21080202G989 and the results were also be used in this study. The method validation for the determination of Al in buffer solutions was performed during this study.
The calibration was performed using the certified Al stock solution (1000 mg/L nominal). All validation conditions for the range of 3 – 50 µg/L Al in pH 8.5 buffer solution were ful-filled except the accuracy in pH 5.5 and pH 7.0 buffer solutions. The accuracy was out-side 70 – 120 % of the nominal values. Therefore, the calibration of Al was additionally performed in each buffer solution.
The correlation coefficient r was > 0.99 and the accuracy values of the calibration stand-ards lay in the demanded ranges 100 ± 15 % and 100 ± 20 % (low concentration) of each calibration.
All accuracy values lay in the demanded range of 70 – 110 % after recalculation of the accuracy in pH 5.5 and pH 7.0 buffer solutions using the corresponding calibration function in the respective buffer. As the values lay outside the range 100 ± 5 %, the mean recovery rates were taken into account in the calculation of Al concentrations in the respective buffer solution. The condition for precision “RSD ≤ 20 % per level” was fulfilled for all media and levels.
During the screening test, the adjustment of pH value in the range of 5.5 ± 0.2 in pH 5.5 buffer solution was not possible as the test item has changed the pH value of the buffer (5.90 – 6.31). The highest concentration of Si was measured in pH 8.5 buffer solution. Therefore, pH 8.5 buffer solution was chosen for the reproducibility test. The concentration of Al was below the LOQ (< 3 µg/L Al).
The reproducibility test was performed with 100 mg/L test item over a period of 24 hours. Five vessels were prepared; each flask was measured in triplicate. A within-vessel variation of max. 10% and a between-vessel variation of max. 20% was demanded. These conditions were fulfilled. The mean concentration of Si in all flasks was stated as 384.0 µg/L Si.
The full test was performed with 1 mg/L nominal load (three replicates) over a period of 28 days with samplings after 2 h, 6 h, 1 d, 4 d, 7 d, 14 d, 21 d and 28 d. Two flasks were prepared as blanks without addition of test item. Dependency of measured concentrations of Si on time was linear during the whole test. The measured concentration of Al was below the LOQ (< 3 µg/L Al) in each flask at each sampling point except on day 28.
Both conditions RSD ≤ 10 % (within-vessel) and ≤ 20 % (between-vessel) were fulfilled for Si in all flasks at each sampling point and Al on day 28 during the full test. On day 1, the within-vessel variation of Si was > 10 % in the flask 3 as one replicate showed the concentration of Si < 10 µg/L.

The following concentrations of Si and Al were stated on day 28:
1 mg/L nominal: 64.7 µg/L Si; 3.48 µg/L Al.

No observations arousing doubts concerning the accuracy of the results and the validity of the study were made.

Conclusions:
The following concentrations of Si and Al were stated for 1 mg/L nominal load after 28 d:

64.7 µg/L Si,
3.48 µg/L Al

at 20.8 ± 0.8 °C and pH 8.41 ± 0.09.

Executive summary:

This study was performed in order to determine the transformation and/or dissolution of Sodasil P-95 via measurement of Silicon (Si) and Aluminium (Al) per ICP-OES in aqueous media. The full test was performed with 1 mg/L nominal load (three replicates) over a period of 28 days with samplings after 2 h, 6 h, 1 d, 4 d, 7 d, 14 d, 21 d and 28 d. The following concentrations of Si and Al were stated on day 28 with 1 mg/L nominal load: 64.7 µg/L Si and 3.48 µg/L Al.

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Aug. 13 - Dec. 14, 2020; experimental phase: Aug. 20-26, 2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
Jul. 27, 1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Specific details on test material used for the study:
Name: SODASIL P-80
Batch no.: 833183AS
Appearance: fine, white powder
Composition: Silicic acid, aluminium sodium salt >98 %
CAS No.: 1344-00-9
EC-No.: not stated
Molecular formula: nSiO2.mAl2O3.zNa2O
Molecular weight: not stated
Purity: >98 % Silicic acid, aluminium sodium salt
Homogeneity: Homogeneous
Production date: 16. Aug. 2019
Expiry date: 16. Aug. 2021
Specific surface area: 67 m²/g
Storage: room temperature (20 ± 5 °C)
Stability: stable under storage conditions
Key result
Water solubility:
ca. 232.5 - ca. 239.7 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 2 - ca. 5 d
Temp.:
20 °C
pH:
>= 10.3 - <= 10.36
Remarks on result:
other: SiO2 concentration
Key result
Water solubility:
ca. 94.19 - ca. 96.75 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 2 - ca. 5 d
Temp.:
20 °C
pH:
>= 10.3 - <= 10.36
Remarks on result:
other: Na concentration
Key result
Water solubility:
ca. 0.053 - ca. 0.061 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 2 - <= 5 d
Temp.:
20 °C
pH:
>= 10.3 - <= 10.36
Remarks on result:
other: Al2O3 concentration
Details on results:
.
Conclusions:
The determination of the solubility of SiO2 in water using two different methods (ICP-OES and photometry) showed almost identical results. The water solubility of SiO2 was stated as 236.1 ± 3.6 mg/L (mean value of two methods). The water solubility of Na was calculated as 95.47 ± 1.28 mg/L. The water solubility of Al2O3 was stated as 57.1 ± 4.0 μg/L Al.
Executive summary:

The solubility of SODASIL P-80 in water was determined by measurement of silicon, sodium and aluminium concentrations in ultrafiltrated test solutions with the nominal concentration 50 g/L. The concentration of the SiO2 and Al2O3 was calculated from the measured concentration of Si and Al and the element content in the respective oxide. For Na no conversion to the oxide was performed, as Na can be present in the solid test item in the form of the oxide as well as in the form of different soluble salts. Potentially available undissolved particles in the filtrated test item solutions were measured using a Tyndall device.

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Aug. 13 - Dec. 14, 2020; experimental phase: Aug. 20 - Sep. 7, 2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
Jul. 27, 1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Specific details on test material used for the study:
Name: SODASILP-110
Batch no.: 030320AS
Appearance: fine, white powder
Composition: Silicic acid, aluminium sodium salt >98 %
CAS No.: 1344-00-9
EC-No.: not stated
Molecular: formula nSiO2.mAl2O3.zNa2O
Molecular weight: not stated
Purity: >98 % Silicic acid, aluminium sodium salt
Homogeneity: Homogeneous
Production date: 03. Mar. 2020
Expiry date: 03. Mar. 2022
Specific surface area: 87 m²/g
Storage: room temperature (20 ± 5 °C)
Storage: stable under storage conditions
Key result
Water solubility:
ca. 61.86 - ca. 67.18 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 11 - ca. 13 d
Temp.:
20 °C
pH:
>= 6.23 - <= 6.41
Remarks on result:
other: SiO2 concentration
Key result
Water solubility:
ca. 138.7 - ca. 141.7 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 4 - ca. 13 d
Temp.:
20 °C
pH:
>= 6.23 - <= 6.41
Remarks on result:
other: Na concentration
Key result
Water solubility:
< 0.019 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 2 - <= 13 d
Temp.:
20 °C
pH:
>= 6.23 - <= 6.41
Remarks on result:
other: Al2O3 concentration
Details on results:
.
Conclusions:
The determination of the solubility of SiO2 in water using two different methods (ICP-OES and photometry) showed very similar results. The water solubility of SiO2 was stated as 64.52 ± 2.66 mg/L (mean value of two methods). The water solubility of Na was calculated as 140.2 ± 1.5 mg/L. The concentration of Al was < 10 μg/L (< LOQ of Al) in all flasks at each sampling point. The concentration of Al2O3 was calculated from the measured concentration of Al and the Al content in Al2O3 as < 19 μg/L.
Executive summary:

The solubility of SODASIL P-110 in water was determined by measurement of silicon, sodium and aluminium concentrations in ultrafiltrated test solutions with the nominal concentration 50 g/L. The concentration of the SiO2 and Al2O3 was calculated from the measured concentration of Si and Al and the element content in the respective oxide. For Na no conversion to the oxide was performed, as Na can be present in the solid test item in the form of the oxide as well as in the form of different soluble salts. Potentially available undissolved particles in the filtrated test item solutions were measured using a Tyndall device.

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Sep. 21 - Dec. 17, 2020; experimental phase: Sep. 28 - Oct. 2, 2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
1995-07-27
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Specific details on test material used for the study:
Name: ZEOCOPY 133
Chemical Name: Silicic acid, aluminum sodium salt
Batch no.: 258100211
Appearance: white powder
Composition: SiO2, typical value, based on ignited material 82 %; Al2O3, typical value, based on ignited material 11 %; Na2O, typical value, based on ignited material 5 %; H2O, typical value loss on ignition 9.8 %; H2O, loss on drying 5.3 %
CAS No.: 1344-00-9
EC-No.: 215-684-8
Molecular formula: nSiO2*mAl2O3*zNa2O
Molecular weight: not stated
Purity: not applicable, UVCB
Homogeneity: Homogeneous
Production date: 02. Oct. 2018
Expiry date: 01. Oct. 2021
Specific surface area: 395 m²/g
Storage: room temperature (20 ± 5 °C); keep away from humidity
Stability: stable under storage conditions
Key result
Water solubility:
ca. 83.99 - ca. 89.09 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 2 - ca. 4 d
Temp.:
20 °C
pH:
>= 6.05 - <= 6.27
Remarks on result:
other: SiO2 concentration
Key result
Water solubility:
ca. 26.93 - ca. 27.47 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 1 - ca. 7 d
Temp.:
20 °C
pH:
>= 6.05 - <= 6.27
Remarks on result:
other: Na concentration
Key result
Water solubility:
ca. 0.036 - ca. 0.038 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 2 - ca. 4 d
Temp.:
20 °C
pH:
>= 6.05 - ca. 6.27
Remarks on result:
other: Al2O3 concentration
Conclusions:
The determination of the solubility of SiO2 in water using two different methods (ICP-OES and photometry) showed very similar results. The water solubility of SiO2 was stated as 86.54 ± 2.55 mg/L (mean value of two methods). The water solubility of Na was calculated as 27.20 ± 0.27 mg/L, corresponding to a relative standard deviation of 1.0 %. The water solubility of Al2O3 was calculated as 37.2 ± 1.1 μg/L.
Executive summary:

This study was performed in order to determine the water solubility of ZEOCOPY 133 via measurement of Silicon (Si), Aluminium (Al) and Sodium (Na) per ICP-OES and Si per photometer. Determination of the water solubility of ZEOCOPY 133 was performed as follows: The quantity of test item necessary to saturate the desired volume of water was used

analogously to all silica samples. 50 g/L test item in water was used. Measurements of three replicates were performed until equilibrium was reached. Then, all other replicates were sampled and analysed. Undissolved particles were measured using Tyndall device.

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Sep. 21 - Dec. 17, 2020; experimental phase: Sep. 28 - Oct. 5, 2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
Jul. 27, 1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Specific details on test material used for the study:
Name: SIPERNAT 820 A
Chemical Name: Silicic acid, aluminum sodium salt
Batch no.: 199032104
Appearance: white powder
Composition: SiO2, typical value, based on ignited material 82 %; Al2O3, typical value, based on ignited material 10 %; Na2O, typical value, based on ignited material 7 %; H2O, loss on ignition, typical value 8.5 %; H2O, loss on drying 5.6 %
CAS No.: 1344-00-9
EC-No.: 215-684-8
Molecular formula: nSiO2*mAl2O3*zNa2O
Molecular weight: not stated
Purity: not applicable, UVCB
Homogeneity: Homogeneous
Production date: 21. Mar. 2019
Expiry date: 20. Mar. 2021
Specific surface area: 88 m²/g
Storage: room temperature (20 ± 5 °C); keep away from humidity
Stability: stable under storage conditions
Key result
Water solubility:
ca. 193.5 - ca. 211.9 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 5 - ca. 7 d
Temp.:
20 °C
pH:
>= 9.25 - <= 9.31
Remarks on result:
other: SiO2 concentration
Key result
Water solubility:
ca. 182.4 - ca. 187.2 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 1 - ca. 7 d
Temp.:
20 °C
pH:
>= 9.25 - <= 9.31
Remarks on result:
other: Na concentration
Key result
Water solubility:
< 0.019 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 1 - <= 7 d
Temp.:
20 °C
pH:
>= 9.25 - <= 9.31
Remarks on result:
other: Al2O3 concentration
Details on results:
.
Conclusions:
The determination of the solubility of SiO2 in water using two different methods (ICP-OES and photometry) showed very similar results. The water solubility of SiO2 was stated as 202.7 ± 9.2 mg/L (mean value of two methods). The water solubility of Na was calculated as 184.8 ± 2.4 mg/L, corresponding to a relative standard deviation of 1.3 %. The water solubility of Al2O3 was calculated as < 19 μg/L
Executive summary:

This study was performed in order to determine the water solubility of SIPERNAT 820 A via measurement of Silicon (Si), Aluminium (Al) and Sodium (Na) per ICP-OES and Si per photometer. Determination of the water solubility of SIPERNAT 820 A was performed as follows: The quantity of test item necessary to saturate the desired volume of water was used

analogously to all silica samples. 50 g/L test item in water was used. Measurements of three replicates were performed until equilibrium was reached. Then, all other replicates were sampled and analysed. Undissolved particles were measured using Tyndall device.

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Sep. 21 - Dec. 17, 2020; experimental phase: Sep. 28 - Oct. 7, 2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
Jul. 27, 1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Specific details on test material used for the study:
Name: ZEOLEX 23 D
Chemical Name: Silicic acid, aluminum sodium salt
Batch no.: 360022011
Appearance: white powder
Composition: SiO2, typical value, based on ignited material 77 %; Al2O3, typical value, based on ignited material 12 %; Na2O, typical value, based on ignited material 8 %; H2O (loss on ignition, typical value) 8.4 %; H2O, loss on drying 6 %
CAS No.: 1344-00-9
EC-No.: 215-684-8
Molecular formula: nSiO2*mAl2O3*zNa2O
Molecular weight: not stated
Purity: not applicable, UVCB
Homogeneity: Homogeneous
Production date: 20. Feb. 2020
Expiry date: 19. Feb. 2023
Specific surface area: 76 m²/g
Storage: room temperature (20 ± 5 °C); keep away from humidity
Stability: stable under storage conditions
Key result
Water solubility:
ca. 173.1 - ca. 181.9 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 3 - ca. 9 d
Temp.:
20 °C
pH:
>= 9.45 - <= 9.57
Remarks on result:
other: Si concentration
Key result
Water solubility:
ca. 221 - ca. 228.6 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 2 - ca. 9 d
Temp.:
20 °C
pH:
>= 9.45 - <= 9.57
Remarks on result:
other: Na concentration
Key result
Water solubility:
ca. 0.03 - ca. 0.032 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 5 - ca. 9 d
Temp.:
20 °C
pH:
>= 9.45 - <= 9.57
Remarks on result:
other: Al2O3 concentration
Conclusions:
The determination of the solubility of SiO2 in water using two different methods (ICP-OES and photometry) showed very similar results. The water solubility of SiO2 was stated as 177.5 ± 4.4 mg/L (mean value of two methods). The water solubility of Na was calculated as 224.8 ± 3.8 mg/L, corresponding to a relative standard deviation of 1.7 %. The water solubility of Al2O3 was calculated as 31.2 ± 1.2 μg/L, corresponding to a relative standard deviation of 3.9 %.
Executive summary:

This study was performed in order to determine the water solubility of ZEOLEX 23 D via measurement of Silicon (Si), Aluminium (Al) and Sodium (Na) per ICP-OES and Si per photometer. Determination of the water solubility of ZEOLEX 23 D was performed as follows:

The quantity of test item necessary to saturate the desired volume of water was used analogously to all silica samples. 50 g/L test item in water was used. Measurements of three replicates were performed until equilibrium was reached. Then, all other replicates were sampled and analysed. Undissolved particles were measured using Tyndall device.

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Aug. 13 - Dec. 14, 2020; experimental phase: Aug. 20-27, 2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
1995-07-27
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Specific details on test material used for the study:
Name: SODASIL P-95
Batch no.: 937201AS
Appearance: fine, white powder
Composition: Silicic acid, aluminium sodium salt >98 %
CAS No.: 1344-00-9
EC-No.: not stated
Molecular formula: nSiO2.mAl2O3.zNa2O
Molecular weight: not stated
Purity: >98 % Silicic acid, aluminium sodium salt
Homogeneity: Homogeneous
Production date: 10. Sep. 2019
Expiry date: 10. Sep. 2021
Specific surface area: 52 m²/g
Storage: room temperature (20 ± 5 °C)
Stability: stable under storage conditions
Key result
Water solubility:
ca. 163.3 - ca. 171.5 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 4 - ca. 5 d
Temp.:
20 °C
pH:
>= 9.82 - <= 9.84
Remarks on result:
other: SiO2 concentration
Key result
Water solubility:
ca. 156.7 - ca. 163.1 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 4 - ca. 5 d
Temp.:
20 °C
pH:
>= 9.82 - <= 9.84
Remarks on result:
other: Na concentration
Key result
Water solubility:
< 0.019 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 1 - ca. 5 d
Temp.:
20 °C
pH:
>= 9.82 - <= 9.84
Remarks on result:
other: Al2O3 concentration
Conclusions:
The determination of the solubility of SiO2 in water using two different methods (ICP-OES and photometry) showed almost identical results. The water solubility of SiO2 was stated as 167.4 ± 4.1 mg/L (mean value of two methods). The water solubility of Na was calculated as 159.9 ± 3.2 mg/L, corresponding to a relative standard deviation of 2.0 %.
The concentration of Al2O3 was calculated from the measured concentration of Al and the Al content in Al2O3 as < 19 μg/L.
Executive summary:

This study was performed in order to determine the water solubility of SODASILP-95 via measurement of Silicon (Si), Aluminium (Al) and Sodium (Na) per ICP-OES and Si per photometer.

Description of key information

The water solubility of Silicic acid, aluminum sodium salt (CAS 1344-00-9, NAS) varies depending on the specific nanoform tested:


SiO2 concentration: 61.86 - 239.7 mg/l 


Na+ concentration: 26.93 - 228.6 mg/l


Al2O3 concentration: < 0.019 - 0.0611 mg/l


Altogether the OECD 105 measurements show a low water solubility of this substance resp its forms, this is supported also by measurement according to OECD 29. Here, the maximum concentration of total dissolved Si and Al was determined in order to identify compounds of the substance which undergo either dissolution or rapid transformation. The following concentrations of Si and Al were stated on day 28 with 1 mg/L nominal load: 64.7 µg/L Si and 3.48 µg/L Al.

Key value for chemical safety assessment

Additional information