Elemental, isotopic, and spectroscopic assessment of chemical fractionation of dissolved organic matter sampled with a portable reverse osmosis system

被引:14
作者
Ouellet, Alexandre [1 ,2 ]
Catana, Dragosh [1 ,2 ]
Plouhinec, Jean-Baptiste [3 ]
Lucotte, Marc [3 ]
Gelinas, Yves [1 ,2 ]
机构
[1] Concordia Univ, Geotop, Montreal, PQ H4B 1R6, Canada
[2] Concordia Univ, Dept Chem & Biochem, Montreal, PQ H4B 1R6, Canada
[3] Univ Quebec, Montreal, PQ H3C 3P8, Canada
关键词
D O I
10.1021/es702523w
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Portable reverse osmosis (RO) systems are increasingly being used for isolating dissolved organic matter (DOM) from freshwater aquatic systems because of their high volume processing capacity and high absolute DOM recoveries. However, obtaining complete recoveries implies the rinsing of the reverse osmosis system with a solution of dilute NaOH and combining the rinse solution and the DOM concentrate. Because of the potential chemical alterations that can affect the integrity of the organic pool leached from the RO system at high pHs, this approach is not compatible with studies based on the molecular-level analysis of DOM. The potential for elemental, isotopic, and chemical fractionation was thus evaluated on a series of freshwater DOM samples concentrated in the field with a portable RO system when the concentrate and the rinse solution are not combined. DOC recoveries in the concentrate varied between 81.6 and 88.8%, and total balance calculations showed total recoveries of dissolved and particulate organic carbon ranging between 96.4 and 106.9%. Despite similar delta C-13 signatures, differences in N content and FTIR-based chemical composition between the concentrate and the rinse DOM solutions suggest some degree of chemical fractionation.
引用
收藏
页码:2490 / 2495
页数:6
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