Standard Methods: 7500-I D:  Radioactive Iodine by Distillation

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Official Method Name
 7500-I D. Distillation Method
Current Revision
Standard Methods Online
Media
 WATER
Instrumentation
 Not Applicable
Method Subcategory
 Radiochemical
Method Source
  Standard Methods
Citation
  Standard Methods Online - Standard Methods for the Examination of Water and Wastewater
Brief Method Summary
 Iodine carrier is added to an acidified sample and iodine is distilled into a caustic solution. The distillate is acidified and the iodine is extracted into CCl4. After back-extraction as iodide, the iodine is purified as PdI2 for counting.
Scope and Application
 Method 7500-I D uses distillation. It takes more time than 7500-I B, but can still reach EPA's recommended detection limit of 1 pCi 131I/L.
Applicable Concentration Range
Interferences
Quality Control Requirements
 See Section 7020 Quality Assurance/Quality Control.
Sample Handling
 Plastic or glass containers. No preservation.
Maximum Holding Time
 14 days
Relative Cost
 $51 to $200
Sample Preparation Methods
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