USGS-NWQL: I-5553: Nitrogen, ammonia plus organic, total-in-bottom-material, dry wt, titration
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Official Method Name
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Nitrogen, ammonia plus organic, titrimetric, digestion-distillation |
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Current Revision
| Oct-90 |
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Media
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SOILS/SEDIMENT |
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Instrumentation
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Titration |
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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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M.J. Fishman, 1993, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of inorganic and organic constituents in water and fluvial sediments: U.S. Geological Survey Open-File Report 93-125 |
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Brief Method Summary
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The sample is subjected to a digestion whereby all organic nitrogen-containing compounds are converted to ammonium salts. The resulting mixture is then made strongly alkaline, and the ammonia so formed is distilled from the mixture into a solution of boric acid and subsequently determined by titration with standard sulfuric acid solution. |
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Scope and Application
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This method may be used for analysis of bottom material containing at least 10 mg/kg of total ammonia plus organic nitrogen. Only that portion of bottom material that passes a 2-mm sieve is taken for analysis (method P-0810, sub-sampling, bottom material, coring). |
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Applicable Concentration Range
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NA |
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Interferences
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There are no known interferences with this method. |
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Quality Control Requirements
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Standardize sulfuric acid titrant with sodium carbonate primary standard solution |
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Sample Handling
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Container Description: 500 mL polypropylene bottle, wide mouth. Treatment and Handling: Chill and maintain 4 degrees C and ship immediately. |
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Maximum Holding Time
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30 days |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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