USGS-NWQL: I-3750: Solids, residue on evaporation at 105 degrees C, total, gravimetric

Summary
Analytes
Revision
Data and Sites

Official Method Name

Solids, residue on evaporation at 105 degrees C, total, gravimetric

Current Revision

1985

Media

WATER

Instrumentation

Gravimetry

Method Subcategory

Inorganic

Method Source

USGS-NWQL

Citation

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

Brief Method Summary

A volume of well-mixed sample is evaporated to dryness. The residue is dried at 105^oC 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 Concentration Range

Interferences

Care must be taken to ensure that a representative sample is provided. Usually, large, floating particles are excluded from the sample.

Quality Control Requirements

Laboratory Blanks (LB)

Sample Handling

Container Description: 250 or 500 mL polyethylene bottle.
Handling and Treatment: Use unfiltered sample to rinse bottle.

Maximum Holding Time

Relative Cost

Less than $50

Sample Preparation Methods

This method has 1 analyte associated with it.

Analyte	Detection Level	Bias	Precision	Pct False Positive	Pct False Negative	Spiking Level
Residue, Total(E-10151) Residue, Total Solids, residue on evaporation, 105degC TS Total Solids	1.000 mg/L	N/A	N/A

Precision Descriptor Notes:	It is estimated that the percent relative standard deviation of this method is greater than 8 percent at 59 mg/L and greater than 3 percent at 1760 mg/L.
Detection Level Note:	Reporting Level defined as smallest measured concentration of a constituent that may be reliably reported using a given analytical method.

Revision	PDF/Link
1985

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USGS-NWQL: I-3750: Solids, residue on evaporation at 105 degrees C, total, gravimetric

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