ASTM: D1068C: Iron by Atomic Absorption, Graphite Furnace
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Official Method Name
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Standard Test Methods for Iron in Water |
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Current Revision
| 1996 |
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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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Brief Method Summary
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Iron is determined by an atomic absorption spectrophotometer used in conjunction with a graphite furnace. A sample is placed in a graphite tube, evaporated to dryness, charred (pyrolyzed or ashed), and atomized. The absorption signal generated during atomization is recorded and compared to standards. |
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Scope and Application
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These test methods cover the determination of iron in water. Procedures are given for determining total iron, dissolved iron, and ferrous iron. Undissolved iron may be calculated from the total iron and dissolved iron determinations. |
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Applicable Concentration Range
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5 - 100 ug/L |
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Interferences
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For a complete discussion on general interferences with furnace procedures, the analyst is referred to Practice D 3919. |
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Quality Control Requirements
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Sample Handling
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Collect the sample in accordance with Practice D 1066, Specification D 1192, or Practices D 3370, as applicable. Samples should be preserved with HNO3 or HCl (sp gr 1.42) to a pH of 2 or less immediately at the time of collection. If only dissolved iron is to be determined, the sample shall be filtered through a 0.45-um membrane filter before acidification. |
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Maximum Holding Time
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The holding time for samples can be calculated in accordance with Practice D 4841. If ferrous iron is to be determined, the sample should be analyzed as soon as possible after collection and contact with atmospheric oxygen should be minimized. |
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Relative Cost
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Unknown |
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Sample Preparation Methods
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