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BS 1647-1:1984

Current

Current

The latest, up-to-date edition.

pH measurement Specification for pH scale

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-12-1984

€156.59
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Foreword
Committees responsible
Specification
1 Scope
2 Definitions
3 pH scale
4 Reference value standard solution
5 Slope factor
Appendices
A Interpretation of pH measurements
B Outline procedures for measurement of pH values
C Bibliography
Tables
1 Accuracy classes for pH measurements
2 pH values of the reference value standard solution
   at various temperatures
3 Values of the slope factor

Defines pH scale in terms of single reference value standard solution of potassium hydrogen phthalate and the (theoretical) slope factor

Committee
W/-
DevelopmentNote
Supersedes 79/55106 DC. (06/2004) Supersedes BS 1647(1961) (07/2004) Reviewed and confirmed by BSI, January 2006. (01/2006)
DocumentType
Standard
Pages
16
PublisherName
British Standards Institution
Status
Current
Supersedes

This Part of BS 1647 specifies requirements for a pH scale in terms of a single reference value standard aqueous solution of potassium hydrogen phthalate with a molality of 0.05 mol/kg, and the (theoretical) slope factor. This pH scale is appropriate for pH measurements of aqueous solutions at temperatures in the range 0 °C to 95 °C using, for calibration, the operational standard solutions specified in Part 2 of this standard.

NOTE 1 Practical pH measurements are based on one or more of the operational reference standard solutions according to circumstances and the reference value standard solution is included in the list of operational standard reference solutions from which the choice is to be made.

NOTE 2 The procedures described in Appendix B are suitable for all pH measurements, including those where other solvents and suspended matter are present, but where the electrode system is calibrated against reference materials in aqueous solution. A.4 gives information about scales for non-aqueous and mixed aqueous solvents.

The best repeatability generally obtainable is ± 0.003 but may be considerably worse than this in solutions containing reactive materials and suspended matter, especially at the extremes of the pH range 0 to 14 and at temperatures above 60 °C.

Guidance on interpretation of pH measurements is given in Appendix A and guidance on accuracy of pH measurements is given in Appendix B.

NOTE 3 The titles of the publications referred to in this Part of this standard are listed on the inside back cover.

BS 7370-4:1993 Grounds maintenance Recommendations for maintenance of soft landscape (other than amenity turf)
BS 4072:1999 Copper/chromium/arsenic preparations for wood preservation
BS 3762-0:1991 Analysis of formulated detergents General introduction
BS 3762-0:1989 Analysis of formulated detergents Introduction and general methods
BS 5086-7:1991 Analysis of butter Method for determination of pH of butter serum
BS 7370-3:1991 Grounds maintenance Recommendations for maintenance of amenity and functional turf (other than sports turf)
BS 6784:1986 Specification for rubber hoses and hose assemblies for automobile power steering systems
DEFSTAN 91-110/3(2015) : 2015 HYDRAULIC FLUID, FIRE RESISTANT AQUEOUS POLYGLYCOL JOINT SERVICE DESIGNATION: OX-40
BS 4072-1:1987 Wood preservation by means of copper/chromium/arsenic compositions Specification for preservatives
DEFSTAN 80-127/1(1989) : INTERIM LACQUER, CELLULOSE NITRATE, TYPE QX - GRADES 1.0 AND 1.1: BRUSHING/SEALING - GRADE 2.0: SPRAYING - GRADES 3.0 AND 3.1: DIPPING
BS 7310:1990 Specification for ion-selective electrodes, reference electrodes, combination electrodes and ion-selective electrode meters for determination of ions in solution
BS 1647-2:1984 pH measurement Specification for reference value standard solutions and operational reference standard solutions
DEFSTAN 91-110/2(2004) : 2004 HYDRAULIC FLUID, FIRE RESISTANT: AQUEOUS POLYGLYCOL JOINT SERVICE DESIGNATION: OX-40

BS 3145:1978 Specification for laboratory pH meters
BS 2690-109:1984 Methods of testing water used in industry Alkalinity, acidity, pH value and carbon dioxide
BS 2586:1979 Specification for glass and reference electrodes for the measurement of pH
BS 1647-2:1984 pH measurement Specification for reference value standard solutions and operational reference standard solutions

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