ASTM: D1293A: pH: Method A: Precise Laboratory Measurement of pH
|
Official Method Name
|
Standard Test Methods for pH of Water |
|---|---|
|
Current Revision
| 1995 |
|
Media
|
WATER |
|
Instrumentation
|
pH Meter |
|
Method Subcategory
|
Inorganic |
|
Method Source
|
|
|
Citation
|
|
|
Brief Method Summary
|
The pH meter and associated electrodes are standardized against two reference buffer solutions that closely bracket the anticipated sample pH. The sample measurement is made under strictly controlled conditions and prescribed techniques. |
|
Scope and Application
|
This test method covers the precise measurement of pH in water under strictly controlled laboratory conditions. |
|
Applicable Concentration Range
|
1.0 - 12.0 pH |
|
Interferences
|
The glass electrode reliably measures pH in nearly all aqueous solutions and in general is not subject to solution interference from color, turbidity, colloidal matter, oxidants, or reductants. The glass electrode reliably measures pH in nearly all aqueous solutions and in general is not subject to solution interference from color, turbidity, colloidal matter, oxidants, or reductants. The reference electrode may be subject to interferences and should be chosen to conform to all requirements of the Method. |
|
Quality Control Requirements
|
|
|
Sample Handling
|
Collect samples in accordance with Practice D 1066, Specification D 1192, or Practices D 3370, whichever is applicable. |
|
Maximum Holding Time
|
|
|
Relative Cost
|
Less than $50 |
|
Sample Preparation Methods
|
