TY - JOUR
T1 - Molecular weight distribution of phosphorus fraction of aquatic dissolved organic matter
AU - Ged, Evan C.
AU - Boyer, Treavor H.
N1 - Funding Information:
This publication is based upon work supported by the US Geological Survey State Water Resources Research Institute Project Number 2011FL267B . Any opinions, findings, conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the US Geological Survey. The authors thank Hugo Sindelar for background information and data on the Everglades, Dawn Sierer at DB Environmental Inc. for sample collection, and Trisha de Torres for measuring and analyzing fluorescence EEMs.
PY - 2013
Y1 - 2013
N2 - This study characterized dissolved organic phosphorus (DOP) that is discharged from the Everglades Agricultural Area as part of the larger pool of aquatic dissolved organic matter (DOM). Whole water samples collected at the Everglades stormwater treat area 1 West (STA-1 W) were fractionated using a batch ultrafiltration method to separate organic compounds based on apparent molecular weight (AMW). Each AMW fraction of DOM was characterized for phosphorus, carbon, nitrogen, UV absorbance, and fluorescence. The DOP content of the Everglades water matrix was characteristically variable constituting 4-56% of total phosphorus (TP) and demonstrated no correlation with dissolved organic carbon (DOC). Measured values for DOP exceeded 14μgL-1 in four out of five sampling dates making phosphorus load reductions problematic for the stormwater treatment areas (STAs), which target inorganic phosphorus and have a goal of 10μgL-1 as TP. The molecular weight distributions revealed 40% of DOP is high molecular weight, aromatic-rich DOM. The results of this research are expected to be of interest to environmental chemists, environmental engineers, and water resources managers because DOP presents a major obstacle to achieving TP levels <10μgL-1.
AB - This study characterized dissolved organic phosphorus (DOP) that is discharged from the Everglades Agricultural Area as part of the larger pool of aquatic dissolved organic matter (DOM). Whole water samples collected at the Everglades stormwater treat area 1 West (STA-1 W) were fractionated using a batch ultrafiltration method to separate organic compounds based on apparent molecular weight (AMW). Each AMW fraction of DOM was characterized for phosphorus, carbon, nitrogen, UV absorbance, and fluorescence. The DOP content of the Everglades water matrix was characteristically variable constituting 4-56% of total phosphorus (TP) and demonstrated no correlation with dissolved organic carbon (DOC). Measured values for DOP exceeded 14μgL-1 in four out of five sampling dates making phosphorus load reductions problematic for the stormwater treatment areas (STAs), which target inorganic phosphorus and have a goal of 10μgL-1 as TP. The molecular weight distributions revealed 40% of DOP is high molecular weight, aromatic-rich DOM. The results of this research are expected to be of interest to environmental chemists, environmental engineers, and water resources managers because DOP presents a major obstacle to achieving TP levels <10μgL-1.
KW - Dissolved organic carbon
KW - Dissolved organic phosphorus
KW - Everglades Agricultural Area
KW - Molecular weight ultrafiltration
KW - Specific ultraviolet absorbance
KW - Stormwater treatment areas
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U2 - 10.1016/j.chemosphere.2013.01.113
DO - 10.1016/j.chemosphere.2013.01.113
M3 - Article
C2 - 23466281
AN - SCOPUS:84884378749
SN - 0045-6535
VL - 91
SP - 921
EP - 927
JO - Chemosphere
JF - Chemosphere
IS - 7
ER -