USGS-NWQL: O-5101-83: Carbon in Bottom Material by Induction Furnace, Dry Weight
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Official Method Name
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Carbon, Inorganic plus Organic, Total in Bottom Material, Dry Weight, Induction Furnace |
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Current Revision
| 1985 |
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Media
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SOILS/SEDIMENT |
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Instrumentation
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Carbon determinator |
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Method Subcategory
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Organic |
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Method Source
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Citation
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Methods for the Determination of Organic Substances in Water and Fluvial Sediments, Techniques of Water-Resources Investigations of the United States Geological Survey, Book 5, Chapter A3 Edited by R.L. Wershaw, M.J. Fishman, R.R Grabbe, and L.E. Lowe |
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Brief Method Summary
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A sample is oxidized, in the presence of oxygen and a catalyst, in a crucible in an induction furnace. The carbon dioxide evolved is measured by thermal conductivity. |
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Scope and Application
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This method is suitable for the determination of total carbon in bottom material at concentrations of 0.1 g/kg and above. |
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Applicable Concentration Range
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<0.1-1,000 g/kg as C |
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Interferences
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Sulfur, halides, and water vapor can interfere but are eliminated by traps. Carbon impurities in the reagents can interfere. |
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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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1 L Glass jar, wide-mouth baked at 450oC. DO NOT RINSE BOTTLE. Chill and maintain at 4oC, ship immediately. |
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Maximum Holding Time
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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