Standard Methods: 7500-RA-D: Radium in Water by Sequential Precipitation
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Official Method Name
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Radium in Water by Sequential Precipitation and Internal Proportional Counter or Scintillation Counter |
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Current Revision
| Standard Methods Online |
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Media
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WATER |
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Instrumentation
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Alpha Scintillation |
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Method Subcategory
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Radiochemical |
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Method Source
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Citation
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Brief Method Summary
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Ra-228 and Ra-226 in water are concentrated and separated by coprecipitation with sulfates of lead and barium and purified by EDTA chelation. After 36-hour ingrowth of actinium-228 from radium-228, actinium-228 is carried on yttrium oxalate, purified, and beta-counted. Radium-226 in supernatant is precipitated as sulfate, purified, and alpha-counted (per 7500-Ra B) or it is transferred to a radon bubbler and determined by an emanation procedure (per 7500-Ra C; the preferred method). |
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Scope and Application
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This proposed method determines soluble radium 228 alone or soluble radium 228 plus radium 226. |
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Applicable Concentration Range
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None given. |
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Interferences
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Quality Control Requirements
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(see Section 1020 of Standard Methods for general QC requirements) |
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Sample Handling
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Add 2 mL concentrated HNO3/L sample at the time of collection or immediately after filtration. No other sample collection, preservation, or storage information is given. |
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Maximum Holding Time
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Relative Cost
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$51 to $200 |
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Sample Preparation Methods
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