EPA-NERL: 206.3: Arsenic by Gaseous Hydride Generation and AA
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Official Method Name
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Arsenic (Atomic Absorption - Gaseous Hydride) |
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Current Revision
| Issued 1974 |
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Media
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WATER |
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Instrumentation
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Gaseous Hydride Method with Atomic Absorption Detection |
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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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Arsenic in a sample is first reduced to the trivalent form using stannous chloride, and converted to arsine (arsenic tri-hydride) using zinc metal. The gaseous hydride is swept into an argon-hydrogen flame of an atomic absorption spectrophometer and measured. |
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Scope and Application
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This method determines inorganic arsenic in drinking water and most fresh and saline waters in the absence of high concentrations of chromium, cobalt, copper, mercury, molybdenum, nickel, and silver. |
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Applicable Concentration Range
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2-20 ug/L (working range). |
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Interferences
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For interferences see EPA Methods 200.0 and 206.5. |
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Quality Control Requirements
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Spike industrial waste samples with a known amount of arsenic to establish adequate recovery. 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 and 206.5. EPA Method 206.5 also provides a procedure to convert arsenic to an inorganic form detectable by this method. |
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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, 206.5 |
