USGS-NWQL: I-7454: Manganese, suspended recoverable, FLAA
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Official Method Name
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Manganese, 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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Manganese is determined by flame atomic absorption spectrometry by direct aspiration of the sample into an air-acetylene flame without preconcentration or pretreatment. 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 and water-suspended sediment containing at least 10 ug/L of manganese. Sample solutions containing more than 1,000 ug/L need either to be diluted or to be read on a less expanded scale. Brines need to be analyzed by the atomic absorption spectrometric, chelation extraction method, providing that the interferences discussed in that method are not exceeded. Suspended recoverable manganese is calculated by subtracting dissolved manganese from total recoverable manganese. Total recoverable manganese 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 ug/L to 1,000 ug/L |
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Interferences
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Magnesium (100 mg/L) and silica (100 mg/L) do not interfere. Magnesium in excess of 100 mg/L may present some interference, especially when the manganese concentration exceeds 500 ug/L. Silica interferes above 100 mg/L. Iron concentration to 4 X 106 ug/L does not interfere. |
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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 Descriptions: 250 mL Polyethylene bottles, acid-rinsed. Treatment and Preservation: Use unfiltered sample to rinse bottle, then acidify collected sample with HNO3 to pH <2. For second sample, filter through 0.45-um filter, use filtered sample to rinse containers and acidify 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 |
