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The Oxygen Isotopic Composition of Phosphate: A Tracer for Phosphate Sources and Cycling

Abstract

Phosphorus (P) is a limiting macro-nutrient for primary productivity and anthropogenic P-loading to aquatic ecosystems is one of the leading causes of eutrophication in many ecosystems throughout the world. Because P has only one stable isotope, traditional isotope techniques are not possible for tracing sources and cycling of P in aquatic systems. However, much of the P in nature is bonded to four oxygen (O) atoms as orthophosphate (PO{sub 4}{sup 3-}). The P-O bonds in orthophosphate are strongly resistant to inorganic hydrolysis and do not exchange oxygen with water without biological mediation (enzyme-mediated recycling). Thus, the oxygen isotopic composition of dissolved inorganic phosphate ({delta}{sup 18}O{sub p}) may be used as a tracer for phosphate sources and cycling in aquatic ecosystems. Recently, several studies have been conducted utilizing {delta}{sup 18}O{sub p} as a tracer for phosphate sources and cycling in various aquatic environments. Specifically, work to date indicates that {delta}{sup 18}O{sub p} is useful for determining sources of phosphate to aquatic systems if these sources have unique isotopic signatures and phosphate cycling within the system is limited compared to input fluxes. In addition, because various processes imprint specific fractionation effects, the {delta}{sup 18}O{sub p} tracer can be utilized to determine the  More>>
Authors:
Mclaughlin, K.; [1]  Young, M. B.; Paytan, A.; Kendall, C. [2] 
  1. Southern California Coastal Water Research Project, Costa Mesa, University of California, CA (United States)
  2. U.S. Geological Survey, University of California, CA (United States)
Publication Date:
May 15, 2013
Product Type:
Technical Report
Report Number:
IAEA-TECDOC-1695
Resource Relation:
Other Information: 6 figs., 1 tab., 58 refs.; Related Information: In: Application of Isotope Techniques for Assessing Nutrient Dynamics in River Basins| 250 p.
Subject:
54 ENVIRONMENTAL SCIENCES; AQUATIC ECOSYSTEMS; BIOMASS; ENZYMES; HYDROLYSIS; ISOTOPE RATIO; OXYGEN; PHOSPHATES; PHOSPHORUS; RECYCLING; STABLE ISOTOPES; STREAMS
OSTI ID:
22118967
Research Organizations:
International Atomic Energy Agency, Isotope Hydrology Section, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISBN 978-92-0-138810-0; ISSN 1011-4289; TRN: XA13R0665075603
Availability:
Available from INIS in electronic form. Also available on-line: http://www-pub.iaea.org/MTCD/publications/PDF/TE-1695_web.pdf; Enquiries should be addressed to IAEA, Marketing and Sales Unit, Publishing Section, E-mail: sales.publications@iaea.org; Web site: http://www.iaea.org/books
Submitting Site:
INIS
Size:
page(s) 93-110
Announcement Date:
Aug 08, 2013

Citation Formats

Mclaughlin, K., Young, M. B., Paytan, A., and Kendall, C. The Oxygen Isotopic Composition of Phosphate: A Tracer for Phosphate Sources and Cycling. IAEA: N. p., 2013. Web.
Mclaughlin, K., Young, M. B., Paytan, A., & Kendall, C. The Oxygen Isotopic Composition of Phosphate: A Tracer for Phosphate Sources and Cycling. IAEA.
Mclaughlin, K., Young, M. B., Paytan, A., and Kendall, C. 2013. "The Oxygen Isotopic Composition of Phosphate: A Tracer for Phosphate Sources and Cycling." IAEA.
@misc{etde_22118967,
title = {The Oxygen Isotopic Composition of Phosphate: A Tracer for Phosphate Sources and Cycling}
author = {Mclaughlin, K., Young, M. B., Paytan, A., and Kendall, C.}
abstractNote = {Phosphorus (P) is a limiting macro-nutrient for primary productivity and anthropogenic P-loading to aquatic ecosystems is one of the leading causes of eutrophication in many ecosystems throughout the world. Because P has only one stable isotope, traditional isotope techniques are not possible for tracing sources and cycling of P in aquatic systems. However, much of the P in nature is bonded to four oxygen (O) atoms as orthophosphate (PO{sub 4}{sup 3-}). The P-O bonds in orthophosphate are strongly resistant to inorganic hydrolysis and do not exchange oxygen with water without biological mediation (enzyme-mediated recycling). Thus, the oxygen isotopic composition of dissolved inorganic phosphate ({delta}{sup 18}O{sub p}) may be used as a tracer for phosphate sources and cycling in aquatic ecosystems. Recently, several studies have been conducted utilizing {delta}{sup 18}O{sub p} as a tracer for phosphate sources and cycling in various aquatic environments. Specifically, work to date indicates that {delta}{sup 18}O{sub p} is useful for determining sources of phosphate to aquatic systems if these sources have unique isotopic signatures and phosphate cycling within the system is limited compared to input fluxes. In addition, because various processes imprint specific fractionation effects, the {delta}{sup 18}O{sub p} tracer can be utilized to determine the degree of phosphorous cycling and processing through the biomass. This chapter reviews several of these studies and discusses the potential to utilize the {delta}{sup 18}O{sub p} of phosphate in rivers and streams. (author)}
place = {IAEA}
year = {2013}
month = {May}
}