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The effect of membrane filtration on dissolved trace element concentrations

Water, Air, and Soil Pollution

By:
, , , , ,
DOI: 10.1007/BF00619288

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Abstract

The almost universally accepted operational definition for dissolved constituents is based on processing whole-water samples through a 0.45-??m 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 'dissolved' 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 As such, simple filtration through a 0.45-??m membrane filter may no longer represent an acceptable operational definition for dissolved chemical constituents.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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The effect of membrane filtration on dissolved trace element concentrations
Series title:
Water, Air, and Soil Pollution
DOI:
10.1007/BF00619288
Volume
90
Issue:
1-2
Year Published:
1996
Language:
English
Publisher:
Kluwer Academic Publishers
Publisher location:
Dordrecht, Netherlands
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Water, Air, and Soil Pollution
First page:
281
Last page:
294
Number of Pages:
14
Conference Title:
Proceedings of the 1995 International Clean Water Conference on Clean Water: Factors that Influence its Availabilty, Quality and its Use
Conference Location:
La Jolla, CA, USA
Conference Date:
28 November 1995 through 30 November 1995