DOM characteristics along the continuum from river to receiving basin: a comparison of freshwater and saline transects

Brandon M. Stephens; Elizabeth C. Minor

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DOM characteristics along the continuum from river to receiving basin: a comparison of freshwater and saline transects

机译：从河流到接收盆地的连续体的DOM特征：淡水和盐分横断面的比较

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The chemical characteristics of bulk (sterile-filtered) and high molecular-weight dissolved organic matter (HMW DOM) were analyzed for freshwater (St. Louis River, Minnesota to Lake Superior) and saline (Elizabeth River, Virginia to Chesapeake Bay) river-to-receiving basin transects. Dissolved organic carbon concentrations and UV-Visible spectroscopy of bulk DOM demonstrated a reduction in organic carbon, colored DOM and aromatic compounds downstream in both transects. The proportion of DOM recoverable via ultrafiltration as HMW material also decreased downstream in both transects, although there was an offset in recoveries between the transects that may be explained by the effects of ionic strength and/or differences in ultrafiltration technique. The analysis of HMW DOM by Fourier transform infrared spectroscopy illustrated similar trends between transects, with a general shift from aromatic/carboxylic compounds nearshore to aliphatic/carbohydrate materials offshore. The parallel changes observed along saline and freshwater transects imply that similar processes play significant roles in the down-gradient alteration of DOM and that ionic strength or pH changes cause second-order effects.

机译：分析了淡水（明尼苏达州的圣路易斯河，苏必利尔湖至苏必利尔湖）和盐水（伊丽莎白河，弗吉尼亚州的切萨皮克湾）的散装（无菌过滤）和高分子量溶解有机物（HMW DOM）的化学特性，到接收盆地的横断面。溶解的有机碳浓度和散装DOM的UV-可见光谱表明，两个样带中有机碳，有色DOM和下游芳香族化合物的减少。通过HMW物质通过超滤可回收的DOM的比例在两个样条线的下游也降低了，尽管样条线之间的回收率存在偏移，这可以用离子强度的影响和/或超滤技术的差异来解释。通过傅立叶变换红外光谱对HMW DOM的分析表明，样线之间的趋势相似，总体上从近岸的芳族/羧酸化合物向近岸的脂族/碳水化合物材料转变。沿盐水和淡水横断面观察到的平行变化表明，相似的过程在DOM的向下梯度变化中起着重要作用，并且离子强度或pH值变化会引起二级效应。

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来源
《Aquatic Sciences》 |2010年第4期|p.403-417|共15页
作者
Brandon M. Stephens; Elizabeth C. Minor;
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作者单位

Large Lakes Observatory, University of Minnesota-Duluth, 2205 East 5th St., Duluth, MN 55812, USA;

rnLarge Lakes Observatory, Department of Chemistry and Biochemistry, University of Minnesota-Duluth, 2205 East 5th St., Duluth, MN 55812, USA;

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收录信息美国《科学引文索引》(SCI);
原文格式 PDF
正文语种 eng
中图分类
关键词
DOM characterization; HMW DOM recovery; FTIR; DOC; lake superior; chesapeake bay;

机译：DOM表征;HMW DOM恢复;FTIR;DOC;苏必利尔湖;切萨皮克湾;

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DOM characteristics along the continuum from river to receiving basin: a comparison of freshwater and saline transects

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