USGS-NWQL: I-1137: Cadmium dissolved in Water by GFAA
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Official Method Name
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Cadmium in Water by Graphite Furnace Atomic Absorption Spectrometry |
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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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Graphite Furnace-Atomic Absorption Spectrometer |
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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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Cadmium is determined by atomic absorption spectrometry in conjunction with a graphite furnace containing a graphite platform. A sample is placed on the graphite platform and a matrix modifier is added. The sample is then evaporated to dryness, charred, and atomized using high-temperature ramping. The absorption signal generated during atomization is recorded and compared with standards. |
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Scope and Application
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This method may be used to determine cadmium in low ionic-strength water and precipitation. |
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Applicable Concentration Range
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0.02 - 1.0ug/L* (*0.1 - 3.0ug/L with Zeeman background correction.) |
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Interferences
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(1) Low concentrations of cadmium at sample collection and lab determination can cause contamination. (2)Interferences such as precipitation in low ionic-strength samples is low. |
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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. (Reference OFR 95-443). |
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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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Relative Cost
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$51 to $200 |
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Sample Preparation Methods
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