The effect of membrane filtration on dissolved trace element concentrations
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The almost universally accepted operational definition for dissolved constituents is based on processing
The almost universally accepted operational definition for dissolved constituents is based on processing whole-water samples through a 0.45-μm membrane filter. Results from field and laboratory experiments indicate that a number of factors associated with filtration, other than just pore size (e.g., diameter, manufacturer, volume of sample processed, amount of suspended sediment in the sample), can produce substantial variations in the ‘disolved’ concentrations of such elements as Fe, Al, Cu, Zn, Pb, Co, and Ni. These variations result from the inclusion/exclusion of colloidally-associated trace elements. Thus, 'dissolved' concentrations quantitated by analyzing filtrates generated by processing whole-water through similar pore-sized membrane filters may not be equal/comparable. As such, simple filtration through a 0.45-μm membrane filter may no longer represent an acceptable operational definition for dissolved chemical constituents. This conclusion may have important implications for environmental studies and regulatory agencies.
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- The effect of membrane filtration on dissolved trace element concentrations
Water, Air, and Soil Pollution
Volume 90, Issue 1-2 , pp 281-294
- Cover Date
- Print ISSN
- Online ISSN
- Kluwer Academic Publishers
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- membrane filters
- filtration artifacts
- major elements
- trace elements
- Industry Sectors
- Author Affiliations
- 1. U.S. Geological Survey, Peachtree Business Center, 3039 Amwiler Road, 30360, Atlanta, GA, USA
- 2. Centre Saint-Laurent, Environment Canada, H2Y2E7, Montreal, Quebec, Canada
- 4. U.S. Geological Survey, Branch of Analytical Services, 5293 Ward Road, 80002, Arvada, CO, USA
- 5. Geological Survey of Canada, 601 Booth Street, KIA OE8, Ottawa, Ontario, Canada
- 7. U.S. Geological Survey, 3535 S. Sherwood Forest Blvd., Suite 120, 70816, Baton Rouge, LA, USA