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Characterizing the oxygen isotopic composition of phosphate sources to aquatic ecosystems

Environmental Science and Technology

By:
, , , , , , ,
DOI: 10.1021/es900337q

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Abstract

The oxygen isotopic composition of dissolved inorganic phosphate (δ18Op) in many aquatic ecosystems is not in isotopic equilibrium with ambient water and, therefore, may reflect the source δ18Op. Identification of phosphate sources to water bodies is critical for designing best management practices for phosphate load reduction to control eutrophication. In order for δ18O p to be a useful tool for source tracking, the δ18Op of phosphate sources must be distinguishable from one another; however, the δ18Op of potential sources has not been well characterized. We measured the δ18O p of a variety of known phosphate sources, including fertilizers, semiprocessed phosphorite ore, particulate aerosols, detergents, leachates of vegetation, soil, animal feces, and wastewater treatment plant effluent. We found a considerable range of δ18Op values (from +8.4 to +24.9‰) for the various sources, and statistically significant differences were found between several of the source types. δ18Op measured in three different fresh water systems was generally not in equilibrium with ambient water. Although there is overlap in δ18Op values among the groups of samples, our results indicate that some sources are isotopically distinct and δ18Op can be used for identifying phosphate sources to aquatic systems.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Characterizing the oxygen isotopic composition of phosphate sources to aquatic ecosystems
Series title:
Environmental Science and Technology
DOI:
10.1021/es900337q
Volume
43
Issue:
14
Year Published:
2009
Language:
English
Publisher:
ACS Publications
Publisher location:
Washington, D.C.
Description:
7 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Science and Technology
First page:
5190
Last page:
5196