BS 1647-1:1984
Current
The latest, up-to-date edition.
pH measurement Specification for pH scale
Hardcopy , PDF
English
31-12-1984
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 |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.