NEMI Method Summary

Method Summary Information

Method Number: 160.1 Media: WATER
Revision: Issued 1971
Method Source: U.S. EPA National Exposure Research Laboratory (NERL) [formerly EMSL]
Analytes in this method
Subcategory: INORGANIC
Official Name: Residue, Filterable (Gravimetric, Dried at 180 oC)
Descriptive Name Filterable Residue by Drying Oven
Source Info: U.S.EPA National Exposure Research Laboratory (NERL)
Microbiological and Chemical Exposure Assessment Research Division (MCEARD)
[formerly the Environmental Monitoring Systems Laboratory (EMSL), Cincinnati, OH]
26 West Martin Luther King Drive
Cincinnati, Ohio 45268-0001
Fax: 513-569-7757
email: DWmethods.help@epa.gov
Citation: Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)
28919 Byte file
Brief Method
Summary:
 A well-mixed sample is filtered through a standard glass fiber filter. The filtrate is evaporated and dried to constant weight at 180oC.
Scope And
Application:
 This method determines filterable residue in drinking, surface, and saline waters; domestic and industrial wastes.
Applicable
Conc Range:
 10 - 20,000 mg/L
Interferences: (A) Mineral Waters: Highly mineralized waters containing significant concentrations of calcium, magnesium, chloride and/or sulfate may be hygroscopic and will require prolonged drying, desiccation and rapid weighing.
(B) Bicarbonate: Samples containing high concentrations of bicarbonate will require careful and possibly prolonged drying at 180oC to insure that all the bicarbonate is converted to carbonate.
(C) High Residue Levels: Too much residue in the evaporating dish will crust over and entrap water that will not be driven off during drying. Total residue should be limited to about 200 mg.
QC Requirements: None.
Sample Handling: Preservation of the sample is not practical; analysis should begin as soon as possible. Refrigeration to 4oC is recommended to reduce microbiological decomposition of solids.
Max Holding Time:
 7 days (MCAWW, Table 1).
Sample Prep Met None.
Relative Cost: Less than $50
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