Molecular weight distribution of phosphorus fraction of aquatic dissolved organic matter

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• 作者：Evan C. Ged ; Treavor H. Boyer ; ^{thboyer@ufl.edu}
• 关键词：Molecular weight ultrafiltration ; Dissolved organic carbon ; Dissolved organic phosphorus ; Everglades Agricultural Area ; Specific ultraviolet absorbance ; Stormwater treatment areas
• 刊名：Chemosphere
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：91
• 期：7
• 页码：921-927
• 全文大小：735 K

文摘

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 14 ¦Ìg L^?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 10 ¦Ìg L^?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 <10 ¦Ìg L^?1.