Registration Dossier
Registration Dossier
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EC number: 285-349-9 | CAS number: 85085-18-3
pH
Administrative data
- Endpoint:
- pH
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Carried out by trained chemists using calibrated equipment under laboratory conditions
Data source
Reference
- Reference Type:
- other company data
- Title:
- Unnamed
Materials and methods
- Principles of method if other than guideline:
- The pH of a 0.5% dispersion of the sample in demineralised water is measured 2 - 24 hours after preparation.
Accurately weigh out 199g of demineralised water on a calibrated balance, into a 400 cm3 squat form plastic beaker. Temperature of water must equal 25 deg C +/- 1degC. Immerse the head of a Silverson mixer in the water. Weigh out accurately, 1g of sample, adjust the speed of Silverson to
6250 rpm +/- 250 rpm. Slowly add the sample to the demineralised water. Continue mixing for 10 minutes.Take care that the entire sample is wetted and dispersed. If clumping occurs, repeat the test. After 10 minutes switch off the mixer. Transfer the dispersion to a screw top polythene bottle. Store at 25 degC +/- 1degC in an incubator. The measurement can be made at any time after 2 hours after placing the sample in the incubator.
Following the manufacturer’s instructions, calibrate the pH meter using the pH 7.0 and pH 10.0 buffer solutions. (Use fresh buffer solutions).
Immerse the electrodes in the test solution. Swirl slowly to allow mixing of the sample and for the reading to equilibrate.Once a constant value is reached, record the pH value on the worksheet - GLP compliance:
- no
Test material
- Reference substance name:
- Silicate(2-), hexafluoro-, disodium, reaction products with lithium magnesium sodium silicate
- EC Number:
- 285-349-9
- EC Name:
- Silicate(2-), hexafluoro-, disodium, reaction products with lithium magnesium sodium silicate
- Cas Number:
- 85085-18-3
- Molecular formula:
- Na0.7[Mg5.3Li0.7Si8O20(OH)0.0F4.0]
- IUPAC Name:
- Synthetic fluorohectorite
- Details on test material:
- Batch number 09-2151-1, manufactured on 31/05/2009
Constituent 1
Results and discussion
pH value
- pH value:
- 8.26
- Temp.:
- 25 °C
- Concentration:
- 0.5 other: % by weight
- Remarks on result:
- other: Measurement carried out in demineralised water
Applicant's summary and conclusion
- Executive summary:
The pH of this substance can only be measured once the material has been dispersed in an aqueous medium. The substance itself is a solid. The substance itself forms a dispersion in water and does not dissolve as such but exhibits a pH due to solubilisation of some surface ions and manufacturing impurities. The pH of the test material in this case was found to be 8.26
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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