NEMI Method Summary

Method Summary Information

Method Number: 160.2 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, Non-Filterable (Gravimetric, Dried at 103-105 oC)
Descriptive Name Non-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)
32131 Byte file
Brief Method
Summary:
 A well-mixed sample is filtered through a glass fiber filter, and the residue retained on the filter is dried to a constant weight at 103-105oC.
Scope And
Application:
 This method determines non-filterable residue in drinking, surface, and saline waters; domestic and industrial wastes.
Applicable
Conc Range:
 4 - 20,000 mg/L
Interferences: (A) Procedure: Filtration apparatus, filter material, pre-washing, post-washing, and drying temperature are specified because these variables have been shown to affect the results.
(B) High Residue Levels: Samples high in Filterable Residue (dissolved solids), such as saline waters, brines and some wastes, may be subject to a positive interference.
Filters: Care must be taken in selecting the filtering apparatus so that washing of the filter and any dissolved solids in the filter (7.5) minimizes this potential interference.
QC Requirements: None.
Sample Handling: Non-representative particulates such as leaves, sticks, fish, and lumps of fecal matter should be excluded from the sample if it is determined that their inclusion is not desired in the final result. Preservation of the sample is not practical; analysis should begin as soon as possible. Refrigeration or icing to 4oC is recommended.
Max Holding Time:
 7 days (MCAWW, Table 1).
Sample Prep Met None.
Relative Cost: Less than $50
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