Standard Methods: 4500-KMnO4:  Potassium Permanganate in Water by Spectrophotometry

  • Summary
  • Analytes
  • Revision
  • Data and Sites
Official Method Name
 Test Method B. Spectrophotometric Method
Current Revision
Standard Methods Online
Media
 WATER
Instrumentation
 Spectroscopy (Colorimetry; Photometry)
Method Subcategory
 Inorganic
Method Source
  Standard Methods
Citation
  Standard Methods Online - Standard Methods for the Examination of Water and Wastewater
Brief Method Summary
 This method is a direct determination of aqueous potassium permanganate solutions. The concentration is directly proportional to the absorbance as measured at 525 nm.
Scope and Application
 This method is applicable to ground and surface waters.
Applicable Concentration Range
 0.1 to 100 mg KMnO4/L depending on cell path length
Interferences
 Turbidity and manganese dioxide. Other color-producing compounds also interfere.
Quality Control Requirements
 None given
Sample Handling
 Potassium permanganate solutions, made in oxidant-demand-free water, are stable for long periods of time if kept in an amber bottle out of direct sunlight. For samples obtained from other sources (those having oxidant demand), analyze potassium permanganate on site, as soon as possible after sample collection.
Maximum Holding Time
 None given
Relative Cost
 Less than $50
Sample Preparation Methods
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