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EC number: 231-133-4 | CAS number: 7440-24-6
- 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:
- 2016-08-30 to 2016-10-04
- 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
- Deviations:
- yes
- Remarks:
- Two vessels were set up in a parallel design, each vessel was sampled several times instead of sampling one single vessel at each point in time
- 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, each vessel was sampled several times instead of sampling one single vessel at each point in time
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- signed 2016-05-31
- Type of method:
- flask method
- Key result
- Water solubility:
- 6.74 g/L
- Conc. based on:
- test mat.
- Loading of aqueous phase:
- 41 g/L
- Incubation duration:
- >= 20 - <= 22 d
- Temp.:
- 20 °C
- pH:
- >= 13.2 - <= 13.3
- Remarks on result:
- other: SD: 0.14 g Sr/L
- Details on results:
- Temperature: The temperature in the thermostatically controlled incubation cabinet was monitored by a thermo data logger (Testo 175-T2. Testo AG. Leutkirch. Germany). The mean temperature was 20.3 ± 0.2 °C.Solution pHThe pH of solutions containing the test item increased to a pH > 13 immediately upon contact with the test item and further up to 13.6 but stabilized at a pH of 13.2 – 13.3 after 3 days of testing. The pH of method blanks remained at 6.7 – 7.0.Oxygen concentrationDuring the test, the oxygen concentration in the acrylic glass box was monitored with a MICRO IV oxygen sensor prior and after sampling. Oxygen concentrations (in %) remained at about 0 %.TurbidityThe turbidity of filtered samples was measured using a Nanocolor 500D photometer (Macherey Nagel, Dueren, Germany) according to ISO 7027 to confirm that measured strontium concentrations correspond to the dissolved fraction. Measured values below 1 FAU (formazine attenuation units) were not further specified and reported as <1 FAU. However, turbidity of ultrapure water is <1 FAU, whereas turbidity of tap water amounts to 2 FAU. The turbidity in samples from test was always <1 FAU indicating that filtered solutions did not contain any undissolved material
- Conclusions:
- According to OECD guideline 105 (1995) and EU method A.6 (2006), the water solubility of strontium was determined with 6.74 ± 0.14 g/L, under the conditions of this test (flask method under protective gas atmosphere; loading of 41 g Sr/L, at 20.0 ± 1.0 °C, pH >13).
Reference
Method validation summary
validation parameter | results | comment |
selectivity | strontium-selective wavelengths of 216.596 nm and 215.284 nm | no matrix effects observed |
linearity | applied calibration functions were linear | correlation coefficients were 0.999995 (pre-test) 0.999707 and 0.999393 (main test) |
limit of detection (LOD) | pre-test: 0.305 µg Sr/L main test: 19.1 – 20.3 µg Sr/[AV3] L | |
limit of quantification (LOQ) | pre-test: 0.914 µg Sr/L main test: 63.3 – 67.8 µg Sr/L[AV4] | |
method blanks | main test: Sr concentrations < LOD (<20.3 – 28.5 µg Sr/L) | method blanks |
accuracy and precision | mean Sr recovery in CRM TM-26.4: pre-test: 94.4 ± 2.9 % (n = 2) | 106 µg Sr/L |
accuracy and precision; repeatability | mean Sr recovery in CRM TM-54.5 (dilution 3 fold) main test (216.596 nm): 106.7 ± 9.3 % (n = 3) main test (215.284 nm): 110.5 ± 2.1 % (n = 3) | 197 µg Sr/L |
accuracy and precision; repeatability | mean Sr recovery in Multi-Element Standard XXI: main test (216.596 nm): 106.2 ± 5.5 % (n = 2) main test (215.284 nm): 113.1 ± 2.2 % (n = 3) | 500 µg Sr/L |
accuracy and precision; repeatability | mean Sr recovery in recalibration standard main test (216.596 nm): 104.6 ± 9.4 % (n = 3) main test (215.284 nm): 112.3 ± 2.1 % (n = 3) | 500 µg Sr/L |
trueness | main test: Sr recoveries in fortified samples: 104.6 – 108.3 % (n = 3) |
Under the conditions of this test (flask method under protective gas atmosphere; loadings of 41.01 g test item/L and 41.04 g test item/L in vessel 1 and 2, respectively), a solubility equilibrium was observed starting on day 20 and the test was determined on day 22. The mean amount of dissolved strontium at 20.0 ± 1.0 °C as measured on day 20, 21 and 22 amounts to 6.74 ± 0.14 g Sr/L (separated by filtration from undissolved test item). After introducing the test item into the argon-purged water in test vessels, an evolution of gas (presumably hydrogen) was observed. The pH of solutions containing the test item increased to a pH > 13 immediately upon contact with the test item and further up to 13.6 but stabilized at a pH of 13.2 – 13.3 after 3 days of testing. The pH of method blanks remained constant at 6.7 – 7.0.
Description of key information
Klawonn, 2016:
Strontium metal is highly reactive and instantly oxidized upon contact with water. It decomposes completely. During the redox-reaction with water, a strong evolution of hydrogen gas and an immediate precipitation of a white, crystalline solid (i.e. Sr(OH)2 is observed. The amount of dissolved Sr cations is determined by the solubility of the Sr(OH)2 precipitate. According to OECD guideline 105 (1995) and EU method A.6 (2006), the water solubility of strontium was determined to be 6.74 ± 0.14 g/L under the conditions of the test (flask method under protective gas atmosphere; loading of 41 g Sr/L, at 20.0 ± 1.0 °C, pH >13)
Key value for chemical safety assessment
- Water solubility:
- 6.74 g/L
- at the temperature of:
- 20 °C
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