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Title: Phosphorus Speciation in Atmospherically Deposited Particulate Matter and Implications for Terrestrial Ecosystem Productivity

Abstract

Chemical forms of P in airborne particulate matter (PM) are poorly known and do not correlate with solubility or extraction measurements commonly used to infer speciation. We used P X-ray absorption near-edge structure (XANES) and 31-P nuclear magnetic resonance (NMR) to determine P species in PM collected at four mountain sites (Colorado and California, USA). Organic P species dominated samples from high elevations, with organic P estimated at 65–100% of total P in bulk samples by XANES and 79–88% in extracted fractions (62–84% of total P) by NMR regardless of particle size (≥ 10 µm or 1–10 µm). Phosphorus monoester and diester organic species were dominant and present in about equal proportions, with low fractions of inorganic P species. By comparison, PM from low elevation contained mixtures of organic and inorganic P, with organic P estimated at 30-60% of total P. Intercontinental PM transport determined from radiogenic lead (Pb) isotopes varied from 0-59% (mean 37%) Asian-sourced Pb at high elevation, whereas stronger regional PM inputs were found at low elevation. Airborne flux of bioavailable P to high elevation ecosystems may be twice as high as estimated by global models, which will disproportionately affect net primary productivity.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [2];  [2]
  1. University of California Merced
  2. Lawrence Berkeley National Laboratory
Publication Date:
Research Org.:
University of California, Merced
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23). Climate and Environmental Sciences Division
Contributing Org.:
UC Merced Environmental Analytical Laboratory Stanford Synchrotron Radiation Lightsource, operated by Stanford University on behalf of the U.S. Department of Energy Canadian Light Source, Saskatchewan, CA
OSTI Identifier:
1570288
Report Number(s):
DOE-UCMerced-SC0016479
DOE Contract Number:  
SC0016479
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Phosphorus, particulate matter, P-XANES, 31-P NMR, mountain ecosystems

Citation Formats

O'Day, Peggy A., Nwosu, Ugwumsinachi G., Barnes, Morgan, Hart, Stephen C., Berhe, Asmeret Asefaw, Christensen, John N., and Williams, Kenneth H. Phosphorus Speciation in Atmospherically Deposited Particulate Matter and Implications for Terrestrial Ecosystem Productivity. United States: N. p., 2019. Web. doi:10.2172/1570288.
O'Day, Peggy A., Nwosu, Ugwumsinachi G., Barnes, Morgan, Hart, Stephen C., Berhe, Asmeret Asefaw, Christensen, John N., & Williams, Kenneth H. Phosphorus Speciation in Atmospherically Deposited Particulate Matter and Implications for Terrestrial Ecosystem Productivity. United States. doi:10.2172/1570288.
O'Day, Peggy A., Nwosu, Ugwumsinachi G., Barnes, Morgan, Hart, Stephen C., Berhe, Asmeret Asefaw, Christensen, John N., and Williams, Kenneth H. Mon . "Phosphorus Speciation in Atmospherically Deposited Particulate Matter and Implications for Terrestrial Ecosystem Productivity". United States. doi:10.2172/1570288. https://www.osti.gov/servlets/purl/1570288.
@article{osti_1570288,
title = {Phosphorus Speciation in Atmospherically Deposited Particulate Matter and Implications for Terrestrial Ecosystem Productivity},
author = {O'Day, Peggy A. and Nwosu, Ugwumsinachi G. and Barnes, Morgan and Hart, Stephen C. and Berhe, Asmeret Asefaw and Christensen, John N. and Williams, Kenneth H.},
abstractNote = {Chemical forms of P in airborne particulate matter (PM) are poorly known and do not correlate with solubility or extraction measurements commonly used to infer speciation. We used P X-ray absorption near-edge structure (XANES) and 31-P nuclear magnetic resonance (NMR) to determine P species in PM collected at four mountain sites (Colorado and California, USA). Organic P species dominated samples from high elevations, with organic P estimated at 65–100% of total P in bulk samples by XANES and 79–88% in extracted fractions (62–84% of total P) by NMR regardless of particle size (≥ 10 µm or 1–10 µm). Phosphorus monoester and diester organic species were dominant and present in about equal proportions, with low fractions of inorganic P species. By comparison, PM from low elevation contained mixtures of organic and inorganic P, with organic P estimated at 30-60% of total P. Intercontinental PM transport determined from radiogenic lead (Pb) isotopes varied from 0-59% (mean 37%) Asian-sourced Pb at high elevation, whereas stronger regional PM inputs were found at low elevation. Airborne flux of bioavailable P to high elevation ecosystems may be twice as high as estimated by global models, which will disproportionately affect net primary productivity.},
doi = {10.2172/1570288},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {10}
}