USGS-NWQL: I-1456: Manganese, dissolved, chelation extraction, FLAA
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Official Method Name
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Manganese, atomic absorption spectrometric, chelation-extraction |
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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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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 following chelation with ammonium pyrrolidine dithiocarbamate (APDC) and extraction with chloroform. The extract is evaporated to dryness, treated with hot nitric acid to destroy organic matter, dissolved in hydrochloric acid, and diluted to a specified volume with demineralized water. The resulting solution is aspirated into the air-acetylene flame of the spectrometer. |
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Scope and Application
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This method may be used to analyze water and brines containing from 1 to 100 ug/L of manganese. Brines containing more than 100 ug/L need either to be diluted or to be read on a less expanded scale. Samples containing more than 100 ug/L need either to be diluted prior to chelation-extraction or to be analyzed by the atomic absorption spectrometric direct method, providing that the interference limits discussed in that method are not exceeded. |
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Applicable Concentration Range
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1 to 100 ug/L manganese |
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Interferences
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Concentrations of iron to 4 X 106 ug/L do not interfere; higher concentrations were not tested. |
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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: 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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