USGS-NWQL: I-1750-85: Solids, dissolved, residue on evaporation at 180 degrees C, gravimetric
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Official Method Name
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Solids, residue on evaporation at 180 deg C, dissolved, gravimetric |
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Current Revision
| 1989 |
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Media
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WATER |
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Instrumentation
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Gravimetry |
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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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Methods for the Determination of Inorganic Substances in Water and Fluvial Sediments, Techniques of Water-Resources Investigations of the United States Geological Survey, Book 5, Chapter A1 Edited by Marvin J. Fishman and Linda C. Friedman |
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Brief Method Summary
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A volume of filtered sample that will yield less than 200 mg of residue is evaporated just to dryness on a steam bath. The residue is then dried at 180 deg C for exactly two hours, cooled in a dessicator and immediately weighed. |
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Scope and Application
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The residue-on-evaporation method is applicable to all water regardless of concentration, provided that the residue layer in the evaporation dish is kept sufficiently thin. |
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Applicable Concentration Range
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0-200 |
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Interferences
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There are no known interferences to this method. |
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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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Description: 250 or 500 mL Polyethylene bottle. Treatment and Preservation: Filter through 0.45-um filter. Use filtered sample to rinse containers. |
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Maximum Holding Time
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180 days after login |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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