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Impact off Water Temperature and Dissolved Oxygen on Copper Cycling in an Urban Estuary

机译：水温和溶解氧对城市河口铜循环的影响

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摘要

An increasing body of evidence suggests that much of the trace metal contamination observed in coastal waters is no longer derived from point-source inputs, but instead originates from diffuse, non-point sources. Previous research has shown that water temperature and dissolved oxygen regulate non-point source processes such as sediment diagenesis; however, limited information is available regarding the effect of these variables on toxic trace metal cycling and speciation in natural waters. Here, we present data on the seasonal variation of dissolved Cu cycling in the Long Island Sound, an urban estuary adjacent to New York City. An operationally defined chemical speciation technique based on kinetic lability and organic complexation has been applied to examine the most ecologically relevant metal fraction. In contrast to the decrease from spring to summer observed in the total dissolved Cu pool (average ± SD: 15.1 ± 4.4 nM in spring and 11.8 ± 3.5 nM in summer), our results revealed that in the highly impacted western US, levels of labile Cu reached higher levels in summer (range 3.6-7.7 nM) than in spring (range 1.5-3.9 nM). Labile Cu in surface waters of the western Sound appeared to have a wastewater source during spring high flow conditions, coinciding with elevated levels of sewage-derived Ag. Labile Cu elsewhere in the LIS during spring apparently resulted from fluvial input and mixing. During summer, labile Cu increased in bottom waters (at one site, bottom water labile Cu increased from 1.5 nM in spring to 7.7 nM in summer), and covariance with tracers of diagenetic remobilization (e.g., Mn) revealed a sedimentary source. Although total dissolved Cu showed no consistent trends with water quality parameters, labile Cu in bottom waters showed an inverse correlation with dissolved oxygen and a positive, exponential correlation with water temperature. These results suggest that future increases in coastal water temperatures may cause the benthic source of labile Cu to become proportionally more significant.
机译：越来越多的证据表明，在沿海水域中观察到的许多痕量金属污染不再来自点源输入，而是源自分散的非点源。先前的研究表明，水温和溶解氧可调节非点源过程，例如沉积物的成岩作用。但是，有关这些变量对天然水中有毒痕量金属循环和物种形成的影响的信息很少。在这里，我们介绍了与纽约市相邻的城市河口长岛海峡中溶解铜的季节性变化的数据。基于动力学不稳定性和有机络合作用的可操作定义的化学形态学技术已用于检查与生态最相关的金属部分。与总溶解态铜库中从春季到夏季的减少相比（平均值±SD：春季为15.1±4.4 nM，夏季为11.8±3.5 nM），我们的结果表明，在受到严重影响的美国西部，不稳定水平夏季铜的含量（范围为3.6-7.7 nM）高于春季（范围为1.5-3.9 nM）。在春季高流量条件下，西部峡湾地表水中的不稳定铜似乎具有废水来源，这与污水中的银含量升高相吻合。春季，LIS中其他地方的不稳定铜显然是由河流输入和混合引起的。在夏季，底水中的不稳定铜含量增加（在某个地点，底水中的不稳定铜含量从春季的1.5 nM增加到夏季的7.7 nM），并且与成岩动员示踪剂（例如Mn）的协方差揭示了沉积源。尽管总溶解铜与水质参数没有一致的趋势，但是底部水中不稳定的铜与溶解氧呈反相关，与水温呈指数相关。这些结果表明，未来沿海水温的升高可能导致不稳定铜的底栖来源成比例增加。

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  • 来源
    《Environmental Science & Technology》 |2007年第17期|6103-6108|共6页
  • 作者

    AARON J. BECK; SERGIO A. SANUDO-WILHELMY;

  • 作者单位

    Marine Sciences Research Center, Stony Brook University, Stony Brook, New York 11794-5000;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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