Standard Methods: 2320 B:  Alkalinity by Titration

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  • Analytes
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Official Method Name
2320 B. Titration Method
Current Revision
Standard Methods 21st Edition (2005); Standard Methods Online
pH Meter
Method Subcategory
Method Source
  Standard Methods
  Standard Methods Online - Standard Methods for the Examination of Water and Wastewater
Brief Method Summary
Hydroxyl ions present in a sample as a result of dissociation or hydrolysis of solutes react with additions of standard acid. Alkalinity thus depends on the end-point pH used.
Scope and Application
Applicable to wastewater, surface waters, and drinking waters.
Applicable Concentration Range
Soaps, oily matter, suspended solids, or precipitates may coat the glass electrode and cause a sluggish response. Allow additional time between titrant additions to let electrode come to equilibrium or clean the electrodes occasionally. Do not filter, dilute, concentrate, or alter sample.
Quality Control Requirements
See Section 2020 Quality Assurance/Quality Control.
Sample Handling
Collect samples in polyethylene or borosilicate glass bottles and store at a low temperature. Fill bottles completely and cap tightly. Because waste samples may be subject to microbial action and to loss or gain of CO2 or other gases when exposed to air, analyze samples without delay, preferably within 1 d. If biological activity is suspected analyze within 6 h. Avoid sample agitation and prolonged exposure to air.
Maximum Holding Time
14 days (regulatory)
Relative Cost
$51 to $200
Sample Preparation Methods