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BS ISO 23496:2019 Determination of pH value. Reference buffer solutions for the calibration of pH measuring equipment >
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BS ISO 23496:2019 Determination of pH value. Reference buffer solutions for the calibration of pH measuring equipment, 2019
- National foreword
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Basic information
- 4.1 General
- 4.2 pH values of primary reference buffer solutions
- 4.3 pH values of secondary reference buffer solutions
- 5 Preparation of primary and secondary reference buffer solutions
- 5.1 General
- 5.2 Reference buffer solution A, pH(R) = 1,679(25 °C), Potassium tetraoxalate dihydrate
- 5.3 Reference buffer solution B, pH(R) = 3,557 (25 °C), Potassium hydrogen tartrate
- 5.4 Reference buffer solution C, pH(R) = 4,005 (25 °C), Potassium hydrogen phthalate
- 5.5 Reference buffer solution D, pH(R) = 6,865 (25 °C), Phosphate
- 5.6 Reference buffer solution E, pH(R) = 7,413 (25 °C), Phosphate
- 5.7 Reference buffer solution F, pH(R) = 9,180 (25 °C), Borax
- 5.8 Reference buffer solution G, pH(R) = 12,454 (25 °C), Calcium hydroxide
- 5.9 Reference buffer solution H, pH(R) = 3,776 (25 °C), Potassium dihydrogen citrate
- 5.10 Reference buffer solution I, pH(R) = 10,012 (25 °C), Sodium carbonate/sodium hydrogen carbonate
- 6 Storage and shelf life
- 7 Examples of pH(R) values of reference buffer solutions
- 8 Additional properties of reference buffer solutions
- Annex A (informative) Examples of pH(R) values as a function of temperature at temperatures from 55 °C to 95 °C
- Annex B (informative) Volumetric method
- Bibliography [Go to Page]