共查询到20条相似文献，搜索用时 31 毫秒
1.
Dina L. López Elizabeth Gierlowski-Kordesch Carol Hollenkamp 《Water, air, and soil pollution》2010,213(1-4):27-45
Sandy Run (Vinton County, southeastern Ohio, USA) is a stream receiving acid mine drainage (AMD) from an abandoned coal mine complex. This stream has been dammed to form Lake Hope. The heavy metal composition of waters (benthic and pore), sediments, and macroinvertebrates in the lake reservoir sediments were analyzed. Lake waters contained Mn as the heavy metal present in higher concentrations followed by Fe, Al, and Zn. Depletion of Fe and Al occurred from precipitation of less soluble Fe and Al oxides and hydroxides along Sandy Run before entering the lake, producing a high Mn water input into the reservoir. Concentrations of heavy metals in the sediments increased toward the dam area. Sequential extraction of metals in the sediments showed that the highest fractions of metals corresponded to the detrital fraction or eroded material from the watershed and metals associated with iron and manganese hydroxides. Heavy metals in the organic sediment fraction were low. Heavy metals from the AMD source, as well as sediments rich in heavy metals eroded from the watershed, were transported to the downstream dam area and stored at the bottom, producing the observed chemistry. Heavy metals in benthic waters also were sourced from the diffusion of ions from sediments and lake waters as variation in pH and redox conditions determined the flux at the sediment–water interface. Metal concentrations were measured within two deposit feeders, oligochaetes and chironomids, and compared to trends in physical metal concentration across the lake. For the four heavy metals with higher concentration in both benthic animals, the concentrations followed the trend: Fe?>?Al?>?Mn?>?Zn, which were similar to the bioavailable metals in the sediments rather than the pore or the benthic water where Mn was the most abundant heavy metal. Ingestion of sediment, not exposure to pore or benthic waters, appeared to be the main transfer mechanism for metals into the biota. Trends and patterns in animal metal concentrations across the lake were probably a complex process controlled by metabolic needs and metallic regulation and tolerance. Even when Mn was the highest concentration heavy metal in the pore waters, it was the lowest to bioconcentrate in the organisms. In comparison, Cd, the lowest concentration metal in the sediments, presented one of the highest bioaccumulation factors. 相似文献
2.
Jeffrey A. Simmons 《Water, air, and soil pollution》2010,209(1-4):123-132
Acid mine drainage (AMD) affects thousands of stream miles in the Appalachian region of the USA and results in elevated concentrations of iron and aluminum in the stream water and sediments and wide ranging pH values. It was hypothesized that these conditions would lead to increased P buffering capacity of the sediments which in turn would cause a decrease in dissolved reactive phosphorus (DRP) in the water column. In the lab fresh Fe, Al, and Mn oxide precipitates all adsorbed DRP strongly but over different pH ranges. Sulfate and calcium ions inhibited adsorption of DRP with Fe oxides but the effect was less apparent with Al oxides. In the field DRP concentration was reduced 54–90% just downstream of an AMD input compared to upstream of the input. In addition the sediment buffering capacity increased and equilibrium phosphate concentration decreased dramatically downstream of the AMD inputs. The strength of the effect and the widespread occurrence of AMD suggest that AMD could be altering the P dynamics of streams and rivers throughout the Appalachian region. 相似文献
3.
The impacts of mining to watersheds are highly variabledepending on the type of mining, processing of ores, andenvironmental factors. This study examined the Hei River incentral China, for impacts of gold and iron mining onconcentrations of metals in river water, river sediments andstream-channel soils. No production processing of ores occurson-site at either mine. Total metal content and extractablemetals using DTPA were determined. Total concentrations of Cd,Cu, Pb and Zn were high in some stream sediments and soils nearthe mine sites; metal concentrations ranged from 4–24, 11–100,11–380, and 33–1600 μg g-1 for Cd, Cu, Pb, and Zn,respectively, in soil. Total cadmium was high in all soilsand sediments. Extractable metals were low, with the exceptionof Pb and Cu. At the gold mine, extractable Pb ranged from 8 to33%; extractable Cu ranged from 3 to 21% of total metalconcentration. Chromium and Ni were not above typicalconcentrations in either soils or river sediments. An abundance of carbonates, high river water pH, and high water flow rates all appear to contribute to limiting quantities of metals in the river water. If mining activities are not changed, impacts of mining on downstream metal concentrations in river water should be nominal. 相似文献
4.
5.
Jean V. Dsa Kelly S. Johnson Dina Lopez Corey Kanuckel Jennifer Tumlinson 《Water, air, and soil pollution》2008,194(1-4):185-197
Acid mine drainage (AMD), a legacy of coal and mineral extraction, contaminates streams with complex mixtures of acid and heavy metals that are usually partitioned between the water column and substrate. Understanding the conditions under which sediments retain toxicity after the water column is cleared is important for predicting the long term success of remediation efforts. We conducted laboratory and field experiments to evaluate the relative contribution of acidity versus metals to the toxicity of AMD contaminated sediment towards aquatic macroinvertebrates. Laboratory bioassays showed that precipitate-coated substrate from AMD-impacted sites were toxic to Ctenodaphnia magna and reduced growth of mayflies (Ephemeroptera: Heptageniidae). Toxicity correlated more with acidity released from the sediment than with metals. After transplantation to a clean stream, the same Al- and Fe-contaminated substrate were not toxic to daphnia and was readily colonized by benthic macroinvertebrates within 5 weeks. 相似文献
6.
Dariusz Ciszewski Urszula Kubsik Urszula Aleksander-Kwaterczak 《Journal of Soils and Sediments》2012,12(9):1445-1462
Purpose
The Matylda catchment, in southern Poland, was polluted by the discharge of mine waters from a lead and zinc mine that inundated parts of a valley floor and caused the accumulation of metal-polluted sediments. After a partial reclamation of the mine site in the early 1980s, polluted sediments continue to accumulate on downstream floodplains and in fishponds. The aim of this study was to reconstruct the changes in metal dispersal during 100?years of mining and during the 40-year post-mining period and to propose a strategy for pollution mitigation in the area.Materials and methods
Analyses of Cu, Cd, Pb, Zn, Mn, Ca, Mg and Fe concentrations, speciation of heavy metals and mineralogical analyses were undertaken on overbank sediment cores and in stream sediments. Concentrations of the same elements and macro-ions soluble in stream waters were also determined.Results and discussion
Concentrations of Zn, Cd and Pb in the sediment profiles vary between 40,000 and 55,000, 300 and 600 and 30,000 and 50,000?mg?kg-1, respectively. Changes of metal concentrations and the stratigraphy of sediments from the floodplains, stream channels and fishponds suggest rapid changes of metal loads migrating downstream during both the mining and post-mining periods. Since the time of mine closure, fine-grained, mine-derived sediments (ca. 12?cm thick) have been the main source of pollution of post-mining sediments and surface waters. Closure of the mine was followed by a relatively short period of rapid redistribution of sediment-associated heavy metals in the stream channel. Since the 1980s, the floodplain and fishponds have received a constant supply of metals. It contrasts with the slow sediment accretion rate and a rapid decrease of metal concentrations in floodplain pools due to dilution by decomposed leaf litter. A fivefold increase of Cd content in waters over the 4.6?km reach of the Matylda stream indicates continuous leaching of this element from the contaminated valley floor.Conclusions
Unsuccessful mine site rehabilitation is due to leaching of mine-originated sediments dispersed over the valley bottom. However, the rate of metal remobilization over the last 40?years is low because of the small thickness and widespread anoxic conditions that prevail within both recent and mine-originated sediments and the alkaline pH of stream water, which reduces metal mobility. Distribution of the contaminated layer over a large area of the valley bottom precludes cost-efficient catchment rehabilitation. 相似文献7.
Brian S. Caruso 《Water, air, and soil pollution》2003,150(1-4):221-324
Water quality simulation was performed to evaluate the effects of restoration alternatives on metals transport in a mountainous watershed in Montana, U.S.A. impacted by hundreds of abandoned hardrock mines. The Water Quality Analysis Simulation Program (WASP5), developed by the U.S. Environmental Protection Agency (U.S. EPA), was used to assist in planning restoration of the Upper Tenmile Creek watershed, a major drinking water supply for the City of Helena. Synoptic survey data collected by U.S. EPA and the U.S. Geological Survey were used for model calibration and validation. The effectiveness of eight restoration alternatives was modeled under steady-state, low flow conditions. These alternatives ranged from removal of adit and point source discharges to modification of the water supply scheme to provide higher in-stream flows. The model was also used for a number of related purposes, including evaluation of metals loadings and losses, exceedances of water quality standards, interactions between metals in water and bed sediment, and model and data uncertainties. Although standards exceedances are common throughout the watershed, modeling results indicated that removal of point sources, mine waste near watercourses, and streambed sediment can help improve water quality. Alteration of the water supply scheme and increasing baseflow will also ultimately be required to meet standards for all metals. The model also showed that although adits and point sources contribute significant metals loadings to the stream during baseflow, in some areas shallow groundwater and bed sediment can also be sources of metals. Adsorption and precipitation onto bed sediments are also important loss mechanisms in some locations. The model helped to identify uncertainties in the metal partition coefficients associated with sediment, significance of precipitation reactions, and locations of unidentified sources and losses of metals. 相似文献
8.
Song Jin Paul H. Fallgren Jeffrey M. Morris Jeffrey S. Cooper 《Water, air, and soil pollution》2008,188(1-4):205-212
A biological source treatment (BST) technique using remote sensing and biogeochemistry has been developed to address acid mine drainage (AMD) at its source. The BST technique utilizes down-hole injections of microbial inoculum and substrate amendments to establish a biofilm on the surface of metal sulfides (AMD source material). The treatment results in an elevated groundwater pH (from acidic to circum-neutral levels) and prevents further oxidation of AMD source material. The first 2 years of an ongoing field study of the BST technique at a reclaimed coal mine in central Tennessee (USA) has produced successful results. For instance, the water chemistry in a monitoring well down-gradient from injection wells has improved substantially as follows: the pH increased 1.3 units from 5.7 to 7.3, the dissolved (0.45 µm-filtered) iron concentration decreased by 84% from 93 to 15 mg/l, the conductivity decreased by 379 µS/cm, and sulfate decreased by 78 mg/l. Electromagnetic induction surveys were conducted to identify AMD source material and monitor BST performance by measuring changes in subsurface resistivity throughout the site. These surveys revealed a treatment zone created between injection wells where the resistance of contaminated groundwater from up-gradient AMD sources increased as it flowed past injection wells, thus, suggesting this technique could be used to treat AMD sources directly or to intercept and neutralize sub-surface AMD. 相似文献
9.
Changes in metal speciation occurring along the river Vormbäckenhave been investigated, and the potential for using such changes to reduce metal transport to areas further downstream has been evaluated.Vormbäcken is situated in a mining region in northern Sweden. Catchment area features likely to influence metal speciation include wetlands situated along the river, addition of treated (liming) effluent water from a mine area, and addition of other surface waters and groundwater. Surface water samples were collected from seven stations along the river on six occasions, representing different flow regimes. The total As, Ca, Cd, Cu, Fe, Pb, and Zn concentrations in the samples were partitioned into particulate (>0.4 μm and 0.2–0.4 μm, or only >0.2 μm) and dissolved (<0.2 μm, either associated with organiccarbon, or as free metal ions and inorganic complexes) fractions by means of filtration and an ion-exchange technique. The most important finding is that, with the exception of Ca, the fraction of particulate bound metals increased with increasing concentrations of particulate Fe. This Fe has its origin in surface waters and groundwater that join the river on its way through the catchment area. It is suggested that adsorption to, or co-precipitation with, such Fe-containing particles may have potential to be used as the initial step in a treatment method based on natural attenuation processes. Furthermore, the fraction of particulate bound metals decreased dramatically upon passing the lake Vormträsket, suggesting that some of these metals may be removed from the river system, at least temporally. 相似文献
10.
J. Y. Lee J. C. Choi M. J. Yi J. W. Kim J. Y. Cheon Y. K. Choi M. J. Choi K. K. Lee 《Water, air, and soil pollution》2005,165(1-4):167-185
This study evaluated potential groundwater contamination with toxic metals in and around an abandoned zinc mine in Korea. Water levels in the mine waste dump indicated occurrence of a losing stream during the period of peak stream flow as a result of snowmelt runoff, which posed the threat of groundwater pollution. The pH values for the groundwaters were near neutral to slightly basic, with a slight increase of the values along the stream flow direction. Higher values of electrical conductivity were observed in the mine area. High dissolved oxygen concentrations clearly indicated an oxygenated groundwater environment. High concentration of sulfate and most dominant Ca-SO4 type groundwaters represent effects of mine drainage and sulfide minerals. In the mine area, groundwater contamination by Zn, Al, Fe, and Mn was observed. Most of the toxic metals decreased with distance from the mine, some have decreased gradually or others more suddenly although some metals were also found in high concentrations- in downgradient area. Levels of toxic metals were relatively low in groundwaters downgradient of the mine, which may be due to the high pH and highly oxygenated conditions, and mixing with metal-free waters. 相似文献
11.
Thomas E. Lachmar Neil I. Burk Peter T. Kolesar 《Water, air, and soil pollution》2006,173(1-4):103-120
Surface water discharge measurements and metals concentrations in the North Fork of the American Fork River, Utah, its tributaries, and the groundwater in the vicinity of the Pacific Mine were used to evaluate the impact of groundwater on loading rates of metals and As to the river. Fish in the river contain As, Cd, and Pb at concentrations that are hazardous to human health if consumed. The results suggest that dissolved As, Cd, Cu, Fe, Mn, Pb, and Zn enter the river when it is a gaining stream. However, the suspended metals load is significantly greater than the dissolved load, and generally decreases through the reach of river adjacent to the mine site. Cadmium and Mn travel as dissolved species while Cu, Fe, Pb, and Zn travel as suspended solids. Arsenic seems to travel both with the suspended solids and in the dissolved state. The geochemical modeling program PHREEQC and a diffuse double layer surface complexation model were used to investigate the chemical controls on metals mobility and attenuation in the surface and groundwaters at the site. Based on the PHREEQC results, the most important process in these waters is the precipitation of ferrihydrite, also referred to as hydrous ferric oxide (HFO). Copper, Pb, most importantly Zn, and to a lesser degree As sorb to HFO. 相似文献
12.
Anne Mette T. Simonsen Kristine B. Pedersen Lis Bach Beata Sternal Juho Junttila Bo Elberling 《Water, air, and soil pollution》2018,229(6):206
Mine tailing management is one of the largest environmental issues related to mining operation. This study uses chemometrics to assess the dispersion of iron mine tailing-affected sediments in Bøkfjorden, Northern Norway. Metal concentrations (Al, As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn) and physico-chemical sediment characteristics (conductivity, organic matter, sulphate, chloride, grain size, CaCO3, pH) were analysed in seven sediment cores collected in a transect out of the fjord along with two reference cores. Results of hierarchical cluster analysis and principal component analysis allowed to distinguish between mine tailing-affected and non-affected sediments. Non-affected sediments were especially characterised by high levels of organic matter whilst mine tailing-affected sediments varied significantly in sediment characteristics depending on location in the fjord. Crucial parameters to reveal mine tailing-affected sediments varied between the target metal Fe along with metals of Cd and Mn, albeit less significant. Variations in mine tailing-affected sediment characteristics could be attributed to other anthropogenic activities in the fjord. Despite potential disturbances, chemometrics made it possible to identify dispersion of mine tailing-affected sediments to cover the inner and middle parts of the fjord. The study demonstrates the advantage of applying chemometrics on complex fjord systems, which in this case was used to distinguish mine tailing-affected sediments from areas with elevated levels of metals not necessarily related to the mine. 相似文献
13.
J. Liebens C. J. Mohrherr K. R. Rao C. A. Houser 《Water, air, and soil pollution》2006,174(1-4):235-263
Bayou Texar in Pensacola, FL, receives pollutants from a variety of sources, presumably including two USEPA's Priorities List sites. To evaluate the potential negative impacts of pollution in this type of setting, we determined the level and distribution of some of the pollutants in the bayou and identified the most likely sources for them. Results show that fluoride, a tracer for a contaminated groundwater plume from one of the Priorities List sites, enters sediments in the northern part of the bayou and migrates into the water. Radium in the bayou most likely also emanates from the contaminated groundwater plume. However, 228Ra/226Ra isotope ratios indicate that the radium enters the plume from the aquifer matrix, and thus does not originate directly at the Priorities List site. PAHs of creosote origin are known to have been released by the second Priorities List site but apparently they do not affect the sediments of the bayou because ratios of individual PAHs show that they are derived from combustion. The concentrations of the PAHs are slightly higher in the northern part of the bayou. Unlike other pollutants, most metals exceed their probable effects level (PEL) in many places in the bayou. The highest concentrations are observed in the northern part of the bayou. Low metal concentrations in monitoring wells and in deep sediments in the bayou suggest that the metals do not come from the groundwater plume. Sediment transport analysis shows that sediments are trapped in the northern part of the bayou. Consequently, long term accumulation explains the observed high concentrations of heavy metals, and other sediment bound pollutants, in the northern part of Bayou Texar. Pollutant concentrations vary greatly spatially, demonstrating the importance of geographical analysis for this type of environmental research. 相似文献
14.
Antonio Santos Juan Luis Santos Irene Aparicio Esteban Alonso 《Water, air, and soil pollution》2010,207(1-4):103-113
Traditionally, the Guadiamar River (Seville, Southwest Spain) has received pollution from two different sources, in its upper section, from a pyrite exploitation (Los Frailes mine) and, in its lower section, from untreated urban and industrial wastes and from intensive agricultural activities. In 1998, the accidental spillage of about 6 million m3 of acid water and sludge from mine tailings to Guadiamar River worsened the pollution of an already contaminated area. The main polluting agents of the spillage were heavy metals. The total concentration of a metal provides scarce information about the effects on environmental processes or about the toxicity of the sediment samples. A more sophisticated fractionation of the sediment samples based on a species distribution can help to understand the behaviour and fate of the metals. This article describes a distribution study of the metals Al, Cd, Cu, Fe, Mn, Pb and Zn by fractionation analysis of sediments from eleven sample sites alongside the Guadiamar Riverbed. The samples were collected in summer 2002, four years after the spillage and after the area had been cleaned. Sequential extraction analysis resulted in the definition of four fraction categories: exchangeable metal (the most available fraction), reducible metal (bound to hydrous oxides of Fe and Mn), oxidizable metal (bound to organic matter and sulphides) and a residual fraction (bound to minerals). Significant increases in the available fraction of several potentially toxic metal ions like Cd, Mn and Zn were found. The distribution pattern was variable along the River. At the site closest to the mineworks, the soluble forms of Cd, Mn and Zn were significantly more abundant that those downstream. Cu and Pb were present in the reducible fraction while Fe was present associated in the residual fraction. 相似文献
15.
Barbara Palumbo-Roe Joanna Wragg Vanessa J. Banks 《Journal of Soils and Sediments》2012,12(10):1633-1640
Purpose
Past metal mining has left a legacy of highly contaminated sediments representing a significant diffuse source of contamination to water bodies in the UK and worldwide. This paper presents the results of an integrated approach used to define the role of sediments in contributing to the dissolved lead (Pb) loading to surface water in a mining-impacted catchment.Materials and methods
The Rookhope Burn catchment, northern England, UK is affected by historical mining and processing of lead ore. Quantitative geochemical loading determinations, measurements of interstitial water chemistry from the stream hyporheic zone and inundation tests of bank sediments were carried out.Results and discussion
High concentrations of Pb in the sediments from the catchment, identified from the British Geological Survey Geochemical Baseline Survey of the Environment (GBASE) data, demonstrate both the impact of mineralisation and widespread historical mining. The results from stream water show that the stream Pb load increased in the lower part of the catchment, without any apparent or significant contribution of point sources of Pb to the stream. Relative to surface water, the interstitial water of the hyporheic zone contained high concentrations of dissolved Pb in the lower reaches of the Rookhope Burn catchment, downstream of a former mine washing plant. Concentrations of 56???g?l?1 of dissolved Pb in the interstitial water of the hyporheic zone may be a major cause of the deterioration of fish habitats in the stream and be regarded as a serious risk to the target of good ecological status as defined in the European Water Framework Directive. Inundation tests provide an indication that bank sediments have the potential to contribute dissolved Pb to surface water.Conclusions
The determination of Pb in the interstitial water and in the inundation water, taken with water Pb mass balance and sediment Pb distribution maps at the catchment scale, implicate the contaminated sediments as a large Pb supply to surface water. Assessment of these diffuse contaminant sources is critical for the successful management of mining-impacted catchments. 相似文献16.
为了探讨重金属在矿山水体环境中的富集规律,以秦岭神安沟矿区沟道地表水、沉积物中的重金属为研究对象,测试了各类重金属含量,并利用Tessier五步连续萃取法分析了沉积物中重金属的5种形态,旨在为该矿区环境恢复治理提供参考。结果显示,未受采矿活动影响的对照区地表水与沉积物均未检出Zn、Pb、Cd,对照区未受污染。受开采活动影响的上、中、下游地表水、沉积物受到Pb、Cd不同程度的污染,下游地表水Pb、Cd分别超标5.3倍、43.3倍,不符合农田灌溉用水水质要求;上、中、下游沉积物中重金属污染负荷指数均达Ⅲ级,沟道沉积物已受到严重污染。沉积物中重金属形态分布特征为：Zn、Cd以有机结合态所占比例最高,Pb以铁锰氧化物结合态所占比例最高,Zn、Pb的生物有效性高。由此得出下游地表水不适于灌溉。由于矿方目前已终止尾矿库淋滤水向沟道排放,沉积物中各类重金属含量已趋于稳定,矿区神安沟地表水、沉积物重金属污染严重,亟需治理恢复。 相似文献
17.
近20年塔里木河干流区地下水埋深变化特征及其生态效应研究 总被引：2，自引：1，他引：1
基于塔里木河干流区近20年水文生态变化监测资料,研究了其地下水埋深时空变化特征与河道来水的相互关系及其生态效应。结果表明:塔河干流上中游段地下水埋深年度变化呈枯水期3—4月变幅在0.42～0.92 m,汛期7—9月变幅在1.06～3.67 m。经近20年的生态输水,2009—2017年9年间下游段地下水埋深平均抬升了3.75 m,地下水埋深随输水量的变化明显,总体上在输水停止后1月内达到峰值,而后逐渐降低,直至下一次输水才会明显回升。2009年之后的生态输水对下游植被恢复效果明显,下游NDVI平均值由0.05提升至0.15。本研究系统分析了塔里木河干流区生态输水以来区域生态环境对地下水的综合响应,可为区域水资源调控和进一步量化输水效益提供理论依据。 相似文献
18.
Brian S. Caruso Aisling D. O’Sullivan Summer Faulkner Michaela Sherratt Rosemary Clucas 《Water, air, and soil pollution》2013,224(10):1-21
Wetlands in mountain environments provide critical ecosystem services but are increasingly threatened by agricultural land use intensification. This study evaluates agricultural nonpoint source nutrient pollution transport in a wetland–stream–lake complex in a mountain, tussock grassland catchment in the South Island, New Zealand. Flow and water-quality monitoring in the Lake Clearwater catchment during three flow events from May to August 2010 (autumn high flow, winter low flow, and winter high flow) showed high concentrations and exceedances of water quality guidelines for total nitrogen (TN) and total phosphorus (TP) in small ephemeral streams draining agricultural land during high flows. Concentrations were attenuated through the wetlands to below guidelines, with the exception of TN which still remained slightly higher. Most TN was in the organic form above and below the wetland, suggesting N sources from animal waste/agricultural land and organic material and vegetation within the wetland. Most TP was particulate associated with suspended solids during high flows. Dissolved forms of N and P generally were below guidelines. Flows and loads (instantaneous and daily) increased at the lake outlet during winter high flow, indicating unaccounted sources to the lake from groundwater, the wetlands, or the lake sediments, and seasonal N saturation. Infiltration losses to shallow groundwater along the main perennial tributary likely re-appear as discharge to the wetlands and lake downstream. Surface–groundwater interactions play a dominant role in N transport to the wetland complex due to highly permeable soils and glacial alluvial deposits. Loads and unit loads of TN and TP were also elevated in the ephemeral streams. Results show that TN and TP concentrations and unit loads during high flows in ephemeral streams in this mountain grassland catchment are similar to, or higher than, values for impacted lowland pasture catchments. Although impacts to the wetland ecosystem have not been observed to date, the lake is shifting toward a mesotrophic state, and further research is needed to elucidate impacts of nutrient loads and help meet conservation and restoration goals. 相似文献
19.
The purpose of this study was to determine the impacts of regional historical uranium mining activities within sediments of the Bowman?CHaley reservoir of southwestern North Dakota. The extent of anthropogenic-influenced watershed impacts were quantified through the determination of sediment metals concentrations and metal enrichment factors to evaluate the potential of geochemically influenced As and U remobilization within the reservoir sediments. Sediment cores were collected and analyzed for total metal concentrations at five locations within the reservoir: Spring Creek delta, Alkali Creek delta, two locations within the North Fork of the Grand River confluence, and adjacent to the reservoir outfall. Pearson-moment correlations were used to establish inter-core metal correlations, while sediment enrichment factors were determined relative to background concentrations. Enrichment factor results suggest all sampling sites are classified as minor to moderately enriched for As and U. Metal behavior for the three reservoir inlets indicated similar metal loading sources and post-depositional behavior, while metals migration within the vicinity of the reservoir outlet appear to be controlled by geochemical and/or physical processes. For the reservoir outlet, As and U normalized to Al suggest the occurrence of vertical migration of As, while surface-bound U remobilization was apparent within the water column immediately above the sediments. Elevated U was found within the Spring Creek inlet, and appear attributed to historical uranium processing operations located in Griffin, North Dakota. While the reservoir As and U sediment concentrations may be considered low, their presence appears directly attributed to historical uranium mining activities within the Bowman?CHaley reservoir watershed. 相似文献
20.
Quantification of seasonal sediment and phosphorus transport dynamics in an agricultural watershed using radiometric fingerprinting techniques 总被引：1，自引：0，他引：1
Natalie L. H. Huisman K. G. Karthikeyan Jasmeet Lamba Anita M. Thompson Graham Peaslee 《Journal of Soils and Sediments》2013,13(10):1724-1734