EPA-NERL: 242.1: Magnesium by Flame AA
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Official Method Name
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Magnesium (Atomic Absorption, Direct Aspiration) |
|---|---|
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Current Revision
| Issued 1971; Editorial Revision 1974 and 1978 |
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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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Brief Method Summary
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A sample prepared according to EPA Method 200.0 is analyzed using a flame atomic absorption spectrometer. Specifications for instrument operation and preparation of standards are provided in the method. |
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Scope and Application
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This method determines magnesium by flame atomic absorption spectrometry. Sample pretreatment according to EPA Method 200.0 determines the applicability. |
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Applicable Concentration Range
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0.02 - 0.5 mg/L (optimal range); 0.007 mg/L (sensitivity). |
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Interferences
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For interferences see EPA Method 200.0. Interference caused by aluminum at concentrations greater than 2 mg/L is masked by addition of lanthanum. Sodium, potassium, and calcium cause no interference at concentrations less than 400 mg/L. |
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Quality Control Requirements
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QC requirements for drinking water procedures are provided in method 200.0 |
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Sample Handling
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Sample handling and preservation procedures are provided in EPA Method 200.0. If high amounts of suspended solids exist, it is acceptable to allow the sample to settle and analyze the supernatant. |
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Maximum Holding Time
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6 months (MCAWW, Table 1). |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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200.0 |
