USGS-NWQL: I-3486-95: Extraction Procedure for Metals in Water by In-Bottle Acid Digestion
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Official Method Name
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Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory - In-Bottle Acid Digestion of Whole-Water Samples |
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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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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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Hoffman, G.L., Fishman, M.J., and Garbarino, J.R., 1996, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory -- In-bottle acid digestion of whole-water samples: U.S. Geological Survey Open-File Report 96-225. |
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Brief Method Summary
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The sample is digested by oven heating with dilute hydrochloric acid in the original sample bottle. Following digestion, the sample is filtered inside a class-100 clean bench to remove particulate matter, and aliquots of the filtrate are analyzed for metals by atomic absorption spectrophotometry (AAS) or other approved methods. For additional information on principles of these methods, see individual methods for each trace metal (Fishman and Friedman, 1989; Fishman, 1993). |
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Scope and Application
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The sample is digested by oven heating with dilute hydrochloric acid in the original sample bottle. Following digestion, the sample is filtered inside a class-100 clean bench to remove particulate matter, and aliquots of the filtrate are analyzed for metals by atomic absorption spectrophotometry (AAS) or other approved methods. For additional information on principles of these methods, see individual methods for each trace metal (Fishman and Friedman, 1989; Fishman, 1993). |
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Applicable Concentration Range
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Not applicable |
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Interferences
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There are no interferences in the acid-digestion procedure. |
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Quality Control Requirements
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Quality-control samples area analyzed at a minimum of one in every ten samples. These QC samples include at least one of each of the following: blanks, quality control samples, third party check solutions, replicates, and spikes. Correlation coefficients for calibration curves must be at least 0.99. QC samples must fall within 1.5 standard deviations of the mean value. If all of the data-acceptance criteria in the SOPs are met, then the analytical data are acceptable. |
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Sample Handling
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Sample bottle: Polypropylene or polyethylene capable of being heated to 85oC without deforming. |
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Maximum Holding Time
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Relative Cost
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Sample Preparation Methods
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