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ASTM D 1293 Document Information:
Title
Standard Test Methods for pH of Water
ASTM International
Publication Date:
Dec 10, 1999
Scope:
These test methods cover the determination of pH by electrometric
measurement using the glass
electrode as the sensor. Two test methods are given as follows:
Test Method A covers the precise measurement of pH in water utilizing
at least two of seven
standard reference buffer solutions for instrument standardization.
Test Method B covers the routine measurement of pH in water and is
especially useful for continuous
monitoring. Two buffers are used to standardize the instrument under
controlled parameters, but the
conditions are somewhat less restrictive than those in Test Method A.
Both test methods are based on the pH scale established by NIST
(formerly NBS) Standard Reference
Materials.(Footnote 2)
Neither test method is considered to be adequate for measurement of pH
in water whose conductivity
is less than about 5 µS/cm. Refer to Test Methods D 5128 and D
5464.
Precision and bias data were obtained using buffer solutions only. It
is the user's responsibility
to assure the validity of these test methods for untested types of
water.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Footnote 2 - "Standard Reference Materials: Standardization of pH
Measurements" Wu and Koch, NBS
Special Publications No. 260-53, 1988.
Keywords:
- hydrogen ion concentration
- pH
- pH buffer solution
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