Item talk:Q270007

From geokb

{

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   "name": "Characterizing the oxygen isotopic composition of phosphate sources to aquatic ecosystems",
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   "datePublished": "2009",
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   "abstract": "The oxygen isotopic composition of dissolved inorganic phosphate (\u03b418Op) in many aquatic ecosystems is not in isotopic equilibrium with ambient water and, therefore, may reflect the source \u03b418Op. Identification of phosphate sources to water bodies is critical for designing best management practices for phosphate load reduction to control eutrophication. In order for \u03b418O p to be a useful tool for source tracking, the \u03b418Op of phosphate sources must be distinguishable from one another; however, the \u03b418Op of potential sources has not been well characterized. We measured the \u03b418O 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 \u03b418Op values (from +8.4 to +24.9\u2030) for the various sources, and statistically significant differences were found between several of the source types. \u03b418Op measured in three different fresh water systems was generally not in equilibrium with ambient water. Although there is overlap in \u03b418Op values among the groups of samples, our results indicate that some sources are isotopically distinct and \u03b418Op can be used for identifying phosphate sources to aquatic systems.",
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