USGS-NWQL: I-3381: Iron, water, whole water recoverable; FLAA
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Official Method Name
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Iron, atomic absorption spectrometric, direct |
|---|---|
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Current Revision
| 1985 |
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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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Iron is determined by atomic absorption spectrometry by direct aspiration of the sample solution into an air-acetylene flame. The procedure may be automated by the addition of a sampler and either a strip-chart recorder or a printer or both. |
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Scope and Application
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This method may be used to analyze water-suspended sediment containing at least 10 ug/L of iron. Sample solutions containing more than 1,000 ug/L need either to be diluted or to be read on a less expanded scale. Total recoverable iron in water-suspended sediment needs to undergo preliminary digestion-solubilization by method I-3485. |
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Applicable Concentration Range
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10 to 1,000 ug/L |
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Interferences
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Individual concentrations of sodium, potassium, chloride, and sulfate (5,000 mg/L each), calcium and magnesium (1,000 mg/L each), nitrate (100 mg/L), chromium, manganese, cobalt, nickel, copper, zinc, silver, cadmium, tin, lead, lithium, mercury, selenium, aluminum, antimony, arsenic, vanadium, boron, and molybdenum (1 X 105 ug/L each) do not interfere. Greater concentrations of each constituent were not investigated. |
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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 I each after every 10 samples |
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Sample Handling
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Container Description: 250 mL Polyethylene bottle, acid-rinsed. Treatment and Preservation: Use unfiltered sample to rinse bottles, then acidify collected sample with HNO3 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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I-3485 |
