USGS-NWQL: I-1735: Sodium, dissolved, atomic absorption spectrometric
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Official Method Name
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Sodium, atomic absorption spectrometric, direct |
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Current Revision
| 1965 |
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Media
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WATER |
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Instrumentation
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Flame Atomic Absorption |
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Method Subcategory
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Inorganic |
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Method Source
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|
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Citation
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Methods for the Determination of Inorganic Substances in Water and Fluvial Sediments, Techniques of Water-Resources Investigations of the United States Geological Survey, Book 5, Chapter A1 Edited by Marvin J. Fishman and Linda C. Friedman |
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Brief Method Summary
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Sodium is determined by atomic absorption spectrometry by direct aspiration of the sample solution into an air-acetylene flame (Fishman and Downs, 1966). The procedure may be automated by the addition of a sampler and either a strip-chart recorder or a printer. |
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Scope and Application
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This method may be used to analyze atmospheric precipitation, water, and brines. Two analytical ranges for sodium are included: from 0.01 to 1.0 mg/L and from 0.10 to 80 mg/L. Sample solutions containing sodium concentrations greater than 80 mg/L need to be diluted. |
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Applicable Concentration Range
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0.01 to 80 mg/L |
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Interferences
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None of the substances commonly occurring in natural water interfere with this method. |
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Quality Control Requirements
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Calibrate instrument using calibration standards (CAL); quality control samples (QCS); and laboratory blanks (LB) analyzed at a minimum of 1 for every 10 samples. |
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Sample Handling
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Container Description: 250 mL polyethylene bottle, nitric acid rinsed Treatment and handling: Filter through 0.45-um filter, use filtered sample to rinse container, acidify sample with nitric acid to pH <2 |
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Maximum Holding Time
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180 days |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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