Effects of anthropogenic inputs on the organic quality of urbanized streams
Effects of anthropogenic inputs on the organic quality of urbanized streams
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DOI：
10.1016/j.watres.2012.01.043
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发表时间：
2012-05-15
期刊：
影响因子：
12.8
通讯作者：
Gray, Kimberly A.
中科院分区：
文献类型：
--
作者：
Kalscheur, Kathryn N.;Penskar, Rebecca R.;Gray, Kimberly A.
由于干旱条件、人口增长以及农业和城市发展的人为影响，废水在地表水供应中所占比例越来越大，这引发了人们对接受处理后废水排放的地表水的有机质量可能对生态和人类健康造成的影响的关注。人为输入改变了有机碳的质量和数量，也影响了水生生态系统保留或转化碳和其他营养物质的能力。本文以裂解-GC/MS(Py-GC/MS)为工具，考察受人为输入影响的郊区河流中溶解有机碳(DOC)是否表现出与天然有机物质(NOM)结构上不同的有机特征。PY-GC/MS不仅能够区分上游污水处理厂排放的河流站点和没有接受排放的河流站点，而且还能够区分受暴雨影响显著的河流站点。在有上游污水处理厂排放的溪水中，无论与污水排放的距离有多远，都有明显的有机特征，表明流出物衍生有机物质(EfOM)的持久性。3-甲基吡啶、2-甲基吡啶、吡咯和乙酰胺的热解碎片被确定为EfOM的指示物，支持了先前的研究，即蛋白质和氨基糖衍生物可能是废水标记物。此外，与土壤多羧酸相关的热解碎片与人为影响最小的溪流地点高度相关。(C)2012爱思唯尔有限公司。保留所有权利。
Due to arid conditions, population growth, and anthropogenic impacts from agricultural and urban development, wastewater effluent makes up an increasingly large percentage of surface water supplies promoting concerns about the potential ecological and human health effects associated with the organic quality of surface waters receiving treated wastewater discharge. Anthropogenic inputs alter the quality and quantity of organic carbon and also affect the ability of aquatic ecosystems to retain or transform carbon and other nutrients. In this paper, we use pyrolysis-GC/MS (Py-GC/MS) as a tool to examine whether the dissolved organic carbon (DOC) in suburban streams influenced by anthropogenic inputs displays an organic signature that is structurally different from natural organic material (NOM). Py-GC/MS was not only able to differentiate among stream sites that received discharge from upstream wastewater treatment plants and those that did not, but also distinguished stream sites influenced significantly by storm water. Distinct organic signatures were evident in stream waters with upstream wastewater treatment plant discharges regardless of the distance from effluent discharge, indicative of the persistent nature of effluent-derived organic material (EfOM). The pyrolysis fragments of 3-methyl-pyridine, 2-methyl-pyridine, pyrrole, and acetamide were identified as indicators of EfOM, supporting previous research that has suggested that protein and aminosugar derivitives are possible wastewater markers. Furthermore, pyrolysis fragments associated with soil polycarboxylic acids correlated highly with stream sites having the least anthropogenic influences. (C) 2012 Elsevier Ltd. All rights reserved.