NEMI Method Summary

Method Summary Information

Method Number: I-3750 Media: WATER
Revision: 1985
Method Source: U.S. Geological Survey (USGS)
Subcategory: INORGANIC Analytes in this method
Official Name: Solids, residue on evaporation at 105 degrees C, total, gravimetric
Descriptive Name Solids, residue on evaporation at 105 degrees C, total, gravimetric
Source Info: USGS Branch of Information Services
Box 25286, MS 417
Federal Center
Denver, CO 80225-0286
Phone: 303-202-4700
Citation: USGS Methods, Volume A1
88366 Byte file
Brief Method
Summary:
 A volume of well-mixed sample is evaporated to dryness. The residue is dried at 105oC for 2.0 h, cooled in a desiccator, and immediately weighed.
Scope And
Application:
 This method may be used to determine the total-solids concentration of any natural or treated water or industrial waste.
Total residue represents the sum of both dissolved and suspended (including colloidal) material in a sample. The determination is not exact, because of the compromise that must be made in selecting the temperature at which the evaporated residue is to be dried. At temperatures sufficient to release water of hydration of the hydrated salts that form on evaporation, there is risk of volatilization of the more volatile dissolved or suspended materials in the sample. On the other hand, drying at a sufficiently low temperature to conserve volatiles fails to remove much of the entrapped water and ordinary water of hydration. Because of these factors, the determination must be considered as providing only an approximation of the sum of dissolved and suspended matter.
The determination is not very useful; determination of dissolved solids (method I-1749) and suspended solids (method I-3765) provides more useful information.
Applicable
Conc Range:
 NA
Interferences: Care must be taken to ensure that a representative sample is provided. Usually, large, floating particles are excluded from the sample.
QC Requirements: Laboratory Blanks (LB)
Sample Handling: Container Description: 250 or 500 mL polyethylene bottle.
Handling and Treatment: Use unfiltered sample to rinse bottle.
Max Holding Time:
 NA
 
Relative Cost: Less than $50
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