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Congener Level PCB Desorption Kinetics of Field-Contaminated Sediments 野外污染沉积物的同族水平多氯联苯解吸动力学
Pub Date : 1999-09-01 DOI: 10.1080/10588339991339496
U. Ghosh, A. Weber, J. N. Jensen, John R. Smith
The purpose of this research was to study congener level PCB desorption kinetics of field-contaminated sediments and develop a simple methodology to analyze the desorption behavior. Batch desorption kinetic studies were conducted using XAD-4 resin. Two-phase desorption kinetics were observed for most PCB congeners, consisting of an initial fast rate followed by an extended period of slow rate. A dual first-order rate model was fitted to the PCB desorption data to estimate PCB concentrations in the fast and slow desorbing pools. The fast and slow desorption rates were found to decrease with increasing chlorina-tion of PCB congeners, decreasing ortho chlorination, and decreasing temperature. Estimated first-order desorption rate constants for the fast pools were found to be two orders of magnitude higher than those for the corresponding slow pools. The log of first-order rate constants for the different PCB congeners were found to be linearly related to the log of octanol-water partition coefficients. There...
本研究的目的是研究野外污染沉积物的同源水平多氯联苯解吸动力学,并建立一种简单的方法来分析解吸行为。用XAD-4树脂进行了间歇解吸动力学研究。两相解吸动力学对大多数PCB同系物进行了观察,包括一个初始的快速解吸速率,随后是一个延长的慢速解吸速率。采用双一级速率模型对多氯联苯解吸数据进行拟合,估计了快解吸池和慢解吸池中多氯联苯的浓度。快速和慢速解吸速率随PCB同系物氯化程度的增加、正位氯化程度的降低和温度的降低而降低。快速池的估计一阶解吸速率常数比相应的慢池高两个数量级。发现不同PCB同族物的一阶速率常数的对数与辛醇-水分配系数的对数呈线性相关。在那里……
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引用次数: 19
Risk Analysis of a Farm Area Near a Lead- and Cadmium-Contaminated Industrial Site 铅镉污染工业场地附近农场的风险分析
Pub Date : 1999-09-01 DOI: 10.1080/10588339991339450
K. Cambra, Teresa Martínez, A. Urzelai, E. Alonso
The Asua Valley is an area on the outskirts of Bilbao where industry and small farms still coexist despite decades of serious environmental pollution. The present study was carried out to estimate the risk to which the residents of the area are exposed as a result of soil/dust ingestion and consumption of locally grown fresh produce, and, on the basis of this data, to delimit the areas that might require environmental clean-up. The relation between lead and cadmium content in soil and plant samples was assessed by multiple linear regression. The level of soil lead content for proposing intervention was determined by assessing the exposure of young children due to soil ingestion, assuming a “central-estimate” ingestion rate of 110 mg/day. Vegetable sampling was stratified according to the level of cadmium in the soil. The intervention content of cadmium was established as the midpoint of the soil sampling stratum previous to the one registering a vegetable consumption hazard quotient of 1; in this interval...
阿苏阿山谷是毕尔巴鄂郊区的一个地区,尽管几十年来环境污染严重,但这里的工业和小农场仍然并存。进行本研究的目的是估计该地区居民因摄取土壤/灰尘和食用当地种植的新鲜农产品而面临的风险,并根据这些数据划定可能需要进行环境清理的地区。采用多元线性回归分析了土壤和植物样品中铅和镉含量的关系。建议干预的土壤铅含量水平是通过评估幼儿因土壤摄入而暴露的情况来确定的,假设“中心估计”摄入率为110毫克/天。根据土壤中镉的含量对蔬菜取样进行分层。将镉的干预含量确定为蔬菜消费危害商为1的土壤采样层之前的土壤采样层的中点;在这段时间里……
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引用次数: 91
Statistical Analysis of Chemical Release Rates from Soils 土壤化学物质释放速率的统计分析
Pub Date : 1999-09-01 DOI: 10.1080/10588339991339469
D. Opdyke, R. Loehr
Two statistical methods for determining the precision of best-fit model parameters generated from chemical rate of release data are discussed. One method uses the likelihood theory to estimate marginal confidence intervals and joint confidence regions of the release model parameters. The other method uses Monte Carlo simulation to estimate statistical inferences for the release model parameters. Both methods were applied to a set of rate of release data that was generated using a field soil. The results of this evaluation indicate that the precision of F (the fraction of a chemical in a soil that is released quickly) is greater than the precision of k1 (the rate constant describing fast release), which is greater than the precision of k2 (the rate constant describing slow release). This occurs because more data are taken during the time period described by F and k1 than during the time period described by F and k2. In general, estimates of F will be relatively precise when the ratio of k1 to k2 is large, ...
讨论了确定化学释放速率数据生成的最佳拟合模型参数精度的两种统计方法。一种方法是利用似然理论估计释放模型参数的边际置信区间和联合置信区域。另一种方法是使用蒙特卡罗模拟来估计释放模型参数的统计推断。这两种方法都应用于一组使用田间土壤生成的释放率数据。该评价结果表明,F(土壤中化学物质快速释放的部分)的精度大于k1(描述快速释放的速率常数)的精度,k1大于k2(描述慢释放的速率常数)的精度。这是因为在F和k1所描述的时间段内比在F和k2所描述的时间段内获得更多的数据。一般来说,当k1与k2的比值较大时,对F的估计相对精确,…
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引用次数: 10
Potential of Soil and Groundwater Contamination Due to Mine Subsidence Under a Landfill 垃圾填埋场下矿山沉陷对土壤和地下水的潜在污染
Pub Date : 1999-07-01 DOI: 10.1080/10588339991339405
Sanjeev Kumar
Results of a study to evaluate the effects of mine subsidence on the integrity of a clay liner and potential for soil and groundwater contamination below a previously mined landfill are presented. The results show that for the existing site conditions, surface subsidence features are expected to be similar to subsidence troughs, and the site has minimal potential of being contaminated due to deep-sited subsidence in the mine. To further reduce potential for soil and groundwater contamination at the site, it is recommended that the minimum thickness of the compacted clay liner be 4 ft instead of the 2 to 3 ft generally used. Discussion is presented indicating that further study is required to develop an adequate design procedure to determine the effects of nonuniform settlement of foundation soils or refuse on the hydraulic conductivity of landfill clay barriers.
本文介绍了一项研究的结果,该研究评估了矿山沉陷对粘土衬砌完整性的影响以及以前开采的垃圾填埋场下面的土壤和地下水污染的可能性。结果表明:在现有场地条件下,地表沉降特征与沉降槽相似,且场地因矿山深部沉降而受到污染的可能性极小;为了进一步减少对场地土壤和地下水的潜在污染,建议压实粘土衬垫的最小厚度为4英尺,而不是通常使用的2至3英尺。讨论表明,需要进一步研究,以制定适当的设计程序,以确定地基土或垃圾的不均匀沉降对垃圾填埋场粘土屏障的水力传导性的影响。
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引用次数: 0
Impact of dissolved organic matter on the desorption and mineralization rates of naphthalene 溶解有机质对萘解吸和矿化速率的影响
Pub Date : 1999-07-01 DOI: 10.1080/10588339991339432
W. Plaehn, Xianda Zhao, B. Dale, T. Voice
The persistence of organic contaminants in plant-soil systems will be largely determined by the basic processes controlling bioavailability: desorption and biodegradation. Both processes can be affected by the presence of and variations in dissolved organic matter (DOM). To evaluate potential effects of DOM in surface soil remediation systems, the kinetics of naphthalene desorption from soil and mineralization in soil solution in the presence of DOM were studied in completely mixed batch reactors (CMBRs). Three different DOM solutions were studied. These were obtained from water extraction of two different soils (muck-highly organic and alfalfa field-agricultural) and a third prepared by reconstituting a fulvic acid reference standard purchased commercially. Neither the desorption rate nor equilibrium partitioning of naphthalene was affected by the presence of varying DOM solutions. The effect on mineralization was evaluated based on an evaluation of a first-order rate constant produced by nonlinear regre...
有机污染物在植物-土壤系统中的持久性在很大程度上取决于控制生物有效性的基本过程:解吸和生物降解。这两个过程都可能受到溶解有机物(DOM)的存在和变化的影响。为了评价DOM在表层土壤修复系统中的潜在作用,在完全混合间歇反应器(cmbr)中研究了DOM存在下土壤中萘的脱附动力学和土壤溶液中的矿化动力学。研究了三种不同的DOM解决方案。这些是从两种不同土壤(淤泥-高有机和苜蓿田-农业)的水提取中获得的,第三种是通过重新配制商业购买的黄腐酸参考标准得到的。不同DOM溶液的存在不影响萘的解吸速率和平衡分配。根据非线性回归方程产生的一阶速率常数,评价了对矿化的影响。
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引用次数: 6
Adsorption of Five Model Organic Compounds on a Peat at Different Stages of Drying 不同干燥阶段泥炭对5种模式有机化合物的吸附
Pub Date : 1999-07-01 DOI: 10.1080/10588339991339397
I. Franco, L. Leita, C. Vischetti, M. Nobili
Acridine orange (AO), dinitrobenzoic acid (DNB), bromocresol green (BCG), bromophenol blue (BPB), and methylene blue (MB) were chosen as model aromatic compounds of different polarity, charge, and solubility in water to examine the effects of solute properties on hydrophobic adsorption. These compounds show strict structural similarities to some herbicides and other potential xenobiotic pollutants and exhibit distinct absorption maxima in the visible region, which allows for their easy determination. A well-decomposed peat (medisaprist) at four different stages of drying was used to determine compound adsorption/desorption influences based on the degree of hydrophobicity and charge density of an organic surface. Adsorption and desorption isotherms were investigated using the batch equilibration method and determining the concentration of free chemicals by UV-Vis spectrophotometry. AO had a high tendency of adsorption and was strongly sorbed on peat samples that had been air-dried for 12 months. The lower ...
以吖啶橙(AO)、二硝基苯甲酸(DNB)、溴甲酚绿(BCG)、溴酚蓝(BPB)和亚甲基蓝(MB)为模型芳香族化合物,研究了不同极性、电荷和水中溶解度的溶质性质对疏水吸附的影响。这些化合物与某些除草剂和其他潜在的外源污染物具有严格的结构相似性,并且在可见光区具有明显的吸收最大值,这使得它们易于测定。在四个不同的干燥阶段,利用分解良好的泥炭(medisaprist)来确定基于有机表面疏水程度和电荷密度的复合吸附/解吸影响。采用间歇平衡法研究了吸附和解吸等温线,用紫外-可见分光光度法测定了游离化学物质的浓度。AO对风干12个月的泥炭样品有很强的吸附力。越低…
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引用次数: 3
Analysis of Diesel Fuel Contamination in Soils by Near-Infrared Reflectance Spectrometry and Solid Phase Microextraction-Gas Chromatography 土壤中柴油污染的近红外反射光谱和固相微萃取-气相色谱分析
Pub Date : 1999-07-01 DOI: 10.1080/10588339991339423
D. Malley, Kristina N. Hunter, G. R. Barrie Webster
A feasibility study was undertaken to determine whether the rapid, nondestructive analytical technology, near-infrared reflectance spectrometry (NIRS) could be used to predict total petroleum hydrocarbon (TPH) in contaminated soil. Hydrocarbon concentrations were determined on samples of diesel-contaminated soils by the solid phase microextraction-gas chromatography (SPME-GC) method. The same samples were then scanned for near-infrared reflectance spectrometry over the wavelength range 1100 to 2498 nm. Calibrations were developed between the NIR spectral data and the reference SPME-GC chemical data using stepwise multiple linear regression. Linear regression relationships between NIR-predicted TPH concentrations and reference data had r2 of 0.68 and 0.72. These results indicate that the combination of NIRS and SPME-GC shows promise as a method for rapid estimation of TPH in soil. A major hurdle in the evaluation of methodology for hydrocarbons residues in soil is the challenge posed by the weathering of s...
研究了近红外光谱(NIRS)快速无损分析技术在污染土壤中预测石油总烃(TPH)的可行性。采用固相微萃取-气相色谱(SPME-GC)法测定柴油污染土壤样品中的碳氢化合物浓度。然后对相同的样品进行近红外反射光谱扫描,波长范围为1100至2498 nm。采用逐步多元线性回归对近红外光谱数据与参考SPME-GC化学数据进行校正。nir预测TPH浓度与参考数据的线性回归关系r2分别为0.68和0.72。这些结果表明,近红外光谱与SPME-GC相结合是一种快速估算土壤TPH的方法。土壤中碳氢化合物残留评价方法的一个主要障碍是土壤风化所带来的挑战。
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引用次数: 49
Simulated Phosphorus and Sediment Loadings in Two Representative Subbasins of the Illinois River 模拟伊利诺伊河两个代表性子流域的磷和泥沙负荷
Pub Date : 1999-07-01 DOI: 10.1080/10588339991339441
T. Udouj, H. D. Scott
Quantification of the factors affecting phosphorus (P) loading to surface waters is important in assessing the contribution from agricultural activities to water quality. This study investigated the long-term impact of applications of P in poultry litter on the loadings of P and sediment to streams in two subbasins of the Illinois River Watershed. The influences of application rate and environmental characteristics were examined utilizing a transport model, a geographical information system (GIS), and 30 years of daily weather data. Simulated runoff and sediment concentrations of P increased linearly with poultry litter application rate. Most P loadings to streams were in the dissolved form, as overall sediment transport was low, particularly in areas with excellent stands of forage. Because only pasturelands received poultry litter and the initial concentrations of P in the soils in the forested areas were low, the forested areas contributed little runoff and sediment P to streams. Areas of high P loadin...
定量分析影响地表水磷负荷的因素对于评估农业活动对水质的贡献具有重要意义。本研究研究了伊利诺斯河流域两个亚流域家禽凋落物中施用磷对河流磷和沉积物负荷的长期影响。利用运输模型、地理信息系统(GIS)和30年的每日天气数据,研究了施用量和环境特征的影响。P的模拟径流和泥沙浓度随家禽凋落物施用量的增加呈线性增加。由于总体沉积物输运较低,特别是在牧草林分优良的地区,大多数磷以溶解形式向河流输送。由于只有牧场接收了家禽凋落物,且森林地区土壤中磷的初始浓度较低,因此森林地区对河流径流和沉积物磷的贡献很小。高磷负荷区…
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引用次数: 4
Copper, Lead, Cadmium, and Zinc Sorption By Waterlogged and Air-Dry Soil 浸水和风干土壤对铜、铅、镉和锌的吸附
Pub Date : 1999-05-01 DOI: 10.1080/10588339991339379
I. Phillips
Competitive sorption of copper (Cu), lead (Pb), cadmium (Cd), and zinc (Zn) was studied in three soils of contrasting chemical and physical properties under air-dry and waterlogged conditions. Comp...
在风干和淹水条件下,研究了不同理化性质土壤对铜、铅、镉和锌的竞争性吸附。比较……
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引用次数: 48
Elevated Soil Arsenic Levels at a Former Crude Oil Storage Facility-Assessment, Remediation, and Possible Sources 原原油储存设施土壤砷含量升高——评估、补救和可能的来源
Pub Date : 1999-05-01 DOI: 10.1080/10588339991339360
D. E. Wellman, D. Reid, A. Ulery
Surface and near-surface soil arsenic levels were measured at a former crude oil storage facility within the greater Los Angeles area of Southern California. Arsenic was present in soil within some portions of the site at concentrations defined as being hazardous by both the State of California and the United States Environmental Protection Agency. The elevated soil total arsenic concentrations ranged from about 30 to 2300 mg/kg and generally occurred in, and adjacent to, the former washing and storage tank locations and along piping runs. In contrast, background concentrations of arsenic in soil at the site ranged from less than the analytical method detection limits (0.5 mg/kg) to approximately 8.0 mg/kg. The elevated soil arsenic concentrations are believed to be the result of the use of arsenical corrosion inhibitors within production wells and possibly the use of arsenical biocides in washing and skimmer tanks. Flow lines from production wells within the oil field to the crude oil storage facility co...
在南加州大洛杉矶地区的一个前原油储存设施中测量了地表和近地表土壤砷水平。该厂部分地区的土壤中存在砷,其浓度被加利福尼亚州和美国环境保护署确定为有害浓度。土壤总砷浓度升高范围约为30至2300毫克/公斤,通常发生在以前的洗涤和储罐位置及其附近以及管道沿线。相比之下,现场土壤中砷的背景浓度从低于分析方法检测限(0.5 mg/kg)到约8.0 mg/kg不等。土壤砷浓度升高的原因据信是在生产井中使用了含砷的缓蚀剂,也可能是在洗涤罐和撇油罐中使用了含砷的杀菌剂。从油田内的生产井到原油储存设施的流水线…
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引用次数: 7
期刊
Journal of Soil Contamination
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