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首页> 外文期刊>Journal of Hazardous Materials >Heavy metals in sediments of two Chesapeake Bay tributaries - Wicomico and Pocomoke Rivers
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Heavy metals in sediments of two Chesapeake Bay tributaries - Wicomico and Pocomoke Rivers

机译：切萨皮克湾两个支流-Wicomico和Pocomoke河流的沉积物中的重金属

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Aquatic sediments can be both sinks and sources of heavy metals. The objective of this study was to measure the concentrations of heavy metals in sediments and sediment-porewaters of two Chesapeake Bay tributaries — Wicomico (WR) and Pocomoke (PR) Rivers so as to better understand the contributions of point (sewage treatment plant — STP) or non-point (agricultural runoff) sources of pollution. Sediment samples from three different depths (3″, 6″ and 9″) at four different sites (one mile before, adjacent to, one and two miles after the STP) on each of the two rivers were collected. This part of WR is residential and receives only STP effluent; whereas this part of PR gets effluents from both the STP and agricultural runoff including runoff from a poultry production farm that generates and stores large amounts of litter. The samples were analyzed for zinc (Zn), lead (Pb), copper (Cu), cadmium (Cd) and arsenic (As) using atomic absorption spectrophotometer (AAS). The concentrations of metals in sediment were normalized against organic carbon content and the correlation coefficient was found to be high in all cases. Concentrations of these metals were significantly higher in the second (near the STP outlet) and third (near the poultry farm) sampling sites in WR and PR, respectively. Metal concentrations decreased significantly (p ≤ 0.05) with depth in both the rivers. High concentrations of ammonia and nitrate in the WR indicate STP as the source of pollution, whereas a large amount of organic matter in PR sediment points toward agricultural runoff (from the poultry farm). As there was no baseline or earlier data on metal concentrations in these rivers the exact anthropogenic metal input could not be estimated.
机译：水生沉积物既可以是汇也可以是重金属的来源。这项研究的目的是测量切萨皮克湾两条支流Wicomico（WR）和Pocomoke（PR）河流的沉积物和沉积物-孔隙水中的重金属浓度，以便更好地了解点（污水处理厂-STP）的贡献）或非点（农业径流）污染源。在两条河中的每条河上，在四个不同的地点（STP之前一英里处，邻近处，一英里后和两英里处）收集了来自三个不同深度（3英寸，6英寸和9英寸）的沉积物样本。 WR的这一部分是居民区，仅接收STP废水。而PR的这部分则从STP和农业径流中获取污水，包括来自产生并存储大量垃圾的家禽生产农场的径流。使用原子吸收分光光度计（AAS）分析样品中的锌（Zn），铅（Pb），铜（Cu），镉（Cd）和砷（As）。相对于有机碳含量，对沉积物中的金属浓度进行了归一化，相关系数在所有情况下都很高。在WR和PR的第二个采样点（靠近STP出口）和第三个采样点（靠近家禽养殖场），这些金属的浓度明显更高。两条河流中的金属浓度随深度显着下降（p≤0.05）。 WR中高浓度的氨和硝酸盐表明STP是污染源，而PR沉积物中的大量有机物则指向农业径流（来自家禽场）。由于在这些河流中没有基线或较早的金属浓度数据，因此无法估算确切的人为金属输入量。

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