Abstract:
:The adsorption of chromate on mineral surfaces has received much attention due to its toxicity in natural systems. Spectroscopic studies have demonstrated that chromate forms inner-sphere complexes on variable-charge surfaces. However, in natural systems chromate has been observed to be fairly mobile, which has been explained by the presence of naturally occurring ligands competing with chromate for mineral surface sites. Silicic acid is a ubiquitous ligand in soil and water environments and also sorbs strongly to variable-charge surfaces. Yet little research has examined its influence on chromate adsorption to variable-charge surfaces such as goethite. This study examined the influence of silicic acid (0.10 and 1.0 mM) on the adsorption kinetics of chromate (0.05 and 0.10 mM) on goethite over a range of common soil pH values (4, 6, and 8). The rate and total quantity of chromate adsorption decreased in all the experiments except at a pH value of 4 and a chromate concentration of 0.05 mM. The inhibition of chromate adsorption ranged from 3.1% (pH = 4, Si = 0.10 mM, chromate = 0.10 mM) to 83.3% (pH = 8, Si = 1.0 mM, chromate = 0.05 mM). The rate of chromate adsorption decreased with an increase in pH and silicic acid concentration. This was attributed to a reduction in the surface potential of goethite on silicic acid adsorption as well as a competition for surface sites. The presence of naturally occurring ligands such as silicic acid may be responsible for the enhanced mobility of chromate in natural systems and demonstrates the importance of competitive adsorption for evaluating the mobility of trace elements.
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Garman SM,Luxton TP,Eick MJdoi
10.2134/jeq2004.1703subject
Has Abstractpub_date
2004-09-01 00:00:00pages
1703-8issue
5eissn
0047-2425issn
1537-2537pii
33/5/1703journal_volume
33pub_type
杂志文章abstract::Wetland soils are able to exhibit both consumption and production of greenhouse gases, and they play an important role in the regulation of the global carbon (C) cycle. Still, it is challenging to accurately evaluate the actual amount of C stored in wetlands. The incorporation of remote sensing data into digital soil ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2016.03.0076
更新日期:2016-11-01 00:00:00
abstract::This study compares the performance of three bioretention media blends for N and P removal from simulated urban runoff in experimental mesocosms. TerraSolve, Biofilter, and "VT Mix" (Virginia Tech) were compared with and without vegetation at varying hydraulic residence times (HRTs). Adsorption isotherm experiments we...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2014.01.0017
更新日期:2014-09-01 00:00:00
abstract::A field lysimeter study with bare ground and five different ground covers was established to evaluate the effect of forage grasses on the fate and transport of two herbicides in leachate. The herbicides were atrazine (ATR; 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) and isoxaflutole [IXF; 5-cyclopropyl-4-(2...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2003.1992
更新日期:2003-11-01 00:00:00
abstract::Degradation of selected pesticides was conducted in a turfgrass soil from a golf course under open (i.e., allowing gas exchange with atmosphere) and sealed systems. The time required for 50% of the initial dose of fenitrothion (O,O-dimethyl O-4-nitro-m-tolyl phosphorothioate), diazinon (O,O-dimethyl O-2-isopropyl-6-me...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.30118x
更新日期:2001-01-01 00:00:00
abstract::Long-term application of phosphorus (P) with animal manure in amounts exceeding removal with crops leads to buildup of P in soil and to increasing risk of P loss to surface water and eutrophication. In most manures, the majority of P is held within inorganic forms, but in soil leachates organic P forms often dominate....
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2006.0131
更新日期:2007-01-09 00:00:00
abstract::Urban sewage sludge (USS) is increasingly applied to agricultural soils, but mixed results have been reported because of variations in reuse conditions. Most field trials have been conducted in cropping systems, which conceal intrinsic soil responses to sludge amendments due to the rhizosphere effect and farming pract...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.1002/jeq2.20093
更新日期:2020-07-01 00:00:00
abstract::Manure application supplies plant nutrients, but also leads to trace element accumulation in soil. This study investigated total and EDTA-extractable B, Cd, Co, Cu and Zn in soil after 25 annual manure applications. The residual effect of 14 annual manure applications followed by 11 yr with no applications was also in...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0214
更新日期:2008-05-02 00:00:00
abstract::Agroforestry, the deliberate integration of trees into agricultural operations, sequesters carbon (C) while providing valuable services on agricultural lands. However, methods to quantify present and projected C stocks in these open-grown woody systems are limited. As an initial step to address C accounting in agrofor...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2010.0098
更新日期:2011-05-01 00:00:00
abstract::Horse paddocks have been identified as a significant contributor of animal waste nutrients to natural waters; thus, modified paddock management is needed. Because chemical amendments pose a health risk to horses, an alternative for reducing nutrient translocation from manure is to add available organic residues to the...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2016.06.0223
更新日期:2017-01-01 00:00:00
abstract::High levels of fecal bacteria are a concern for recreational waters; however, the source of contamination is often unknown. This study investigated whether direct sequencing of a bacterial gene could be utilized for detecting genetic differences between bacterial strains for microbial source tracking. A 525-nucleotide...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2004.1024
更新日期:2004-05-01 00:00:00
abstract::Repeated manure application can lead to excessive soil test P (STP) levels and increased P concentration in runoff, but also to improved water infiltration and reduced runoff. Research was conducted to evaluate soil P tests in prediction of P concentration in runoff and to determine the residual effects of composted m...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2005.0084
更新日期:2006-03-01 00:00:00
abstract::Spray irrigation of forested land can provide an effective system for nutrient removal and treatment of municipal wastewater. Evolution of N2 + N2O from denitrifying activity is an important renovation pathway for N applied to forested land treatment systems. Federal and state guidance documents for design of forested...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.3041411x
更新日期:2001-07-01 00:00:00
abstract::Interest in the use of biochar from pyrolysis of biomass to sequester C and improve soil productivity has increased; however, variability in physical and chemical characteristics raises concerns about effects on soil processes. Of particular concern is the effect of biochar on soil N dynamics. The effect of biochar on...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2011.0133
更新日期:2012-07-01 00:00:00
abstract::Acidification of mine wastes can lead to a series of environmental problems, such as acid drainage, heavy metal mobilization, and ecosystem degradation. Prediction of acid-forming potential is one of the key steps in management of sulfide-bearing mine wastes. In this paper, the acid-forming potential of 180 mine waste...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2006.0420
更新日期:2007-05-07 00:00:00
abstract::Prudent interventions for reducing selenium (Se) in groundwater and streams within an irrigated river valley must be guided by a sound understanding of current field conditions. An emerging picture of the nature of Se contamination within the Lower Arkansas River Valley in Colorado is provided by data from a large num...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2008.0499
更新日期:2009-10-29 00:00:00
abstract::Carbon (C) and nitrogen (N) play an important role in the restoration of ecosystem functions of reclaimed mine soils (RMSs). Postreclamation land use in RMSs affects soil C and N pools and fluxes. We compared the effects of 28-yr-old postreclamation land uses (forest, hay, and pasture) on selected chemical properties ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0071
更新日期:2007-10-24 00:00:00
abstract::Poultry litter (PL) is a by-product of broiler production. Most PL is land applied. Land-applied PL is a valuable nutrient source for crop production but can also be a route of environmental contamination with manure-borne bacteria. The objective of this study was to characterize the fate of pathogens, fecal indicator...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2013.10.0432
更新日期:2014-09-01 00:00:00
abstract::Phosphorus (P) runoff from fields fertilized with swine (Sus scrofa domesticus) manure may contribute to eutrophication. The objective of this study was to evaluate the effect of aluminum sulfate (alum) and aluminum chloride applications to swine manure on P runoff from small plots cropped to tall fescue (Festuca arun...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.303992x
更新日期:2001-05-01 00:00:00
abstract::This study determined distribution of feces and urine from 36 lactating dairy cattle (Bos taurus) managed in a rotationally grazed 0.74-ha endophyte-free tall fescue (Festuca arundinacea Schreb.)-white clover (Trifolium repens L.) pasture. Cows were observed for 24 h five times from July 1997 to April 1998, and for 13...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.2180
更新日期:2001-11-01 00:00:00
abstract::Operator-controlled and computer-controlled scanning electron microscopy (CCSEM) are used extensively to characterize particulate matter in environmental media. Analysis in a scanning electron microscope (SEM) coupled with chemical extraction is a potentially powerful tool that is capable of determining how various sa...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2010.0315
更新日期:2011-05-01 00:00:00
abstract::Annual and multiyear records of trace element deposition are difficult to develop using monitoring systems but have proven feasible using plant material in several settings. Here, we used material from several tree species (Populus deltoides W. Bartram ex Marshall, Platanus occidentalis L., and Ginkgo biloba L.) to de...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.1002/jeq2.20009
更新日期:2020-01-01 00:00:00
abstract::Transitional ecotones such as vegetated buffer strips, stream banks, and streambeds retain phosphorus (P) in the immediate surroundings of farmland. Yet the fate of P in these ecotones remains unclear. Our objectives were to (i) test the difference in the P pool composition of soil and sediment between sites surrounde...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2019.01.0012
更新日期:2019-09-01 00:00:00
abstract::Terbuthylazine [N2-tert-butyl-6-chloro-N4-ethyl-1,3,5-triazine-2,4-diamine] degradation pathways in agricultural soils were evaluated by following the appearance and mobility of its main transformation products: dealkylated and hydroxylated derivatives. Three experimental degradation studies in open field were perform...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2003.1089
更新日期:2003-05-01 00:00:00
abstract::The influence of biochar on nitrogen (N) transformation processes in soil is not fully understood. This study assessed the influence of four biochars (wood and poultry manure biochars synthesized at 400 degrees C, nonactivated, and at 550 degrees C, activated, abbreviated as: W400, PM400, W550, PM550, respectively) on...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2009.0138
更新日期:2010-07-01 00:00:00
abstract::Although many studies have pointed out the various controlling factors of sediment and nutrient delivery on a plot or watershed scale, little is known on the spatial variability of sediment and nutrient delivery on a regional scale. This study was conducted to reveal regional variations in sediment-associated nutrient...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2002.8700
更新日期:2002-05-01 00:00:00
abstract::From 1974 to 1984, 543 Mg ha(-1) of biosolids were applied to portions of a land-reclamation site in Fulton County, IL. Soil organic C increased to 5.1% then decreased significantly (p < 0.01) to 3.8% following cessation of biosolids applications (1985-1997). Metal concentrations in amended soils (1995-1997) were not ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2004.2078
更新日期:2004-11-01 00:00:00
abstract::Accurately capturing dynamic soil response to disturbance effects in agroecosystem models remains elusive, thereby limiting projections of climate change mitigation potential. Perennial grasses cultivated in zero-tillage management systems hold promise as sustainable agroecosystems. High-yielding tropical C grasses of...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2017.07.0280
更新日期:2018-07-01 00:00:00
abstract::A commonly used method of measuring enteric methane (CH4) emissions from ruminants is the SF6 tracer technique that measures respired and eructated CH4. However, within the animal, a small proportion of CH4 is produced post-ruminally and some of this may escape through the rectum. The comparison of emissions using a c...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2006.0054
更新日期:2006-08-09 00:00:00
abstract::Herbicides may leach from agricultural fields into ground water feeding adjacent wetlands. However, only little is known of the fate of herbicides in wetland areas. The purpose of the study was to examine the potential of a riparian fen to mineralize herbides that could leach from an adjacent catchment area. Slurries ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.30124x
更新日期:2001-01-01 00:00:00
abstract::Passage of agricultural runoff through vegetated drainage ditches has been shown to reduce the amount of pesticides, such as atrazine, exiting out of agricultural watersheds. Previous studies have found that microbial communities in soil from fields treated with atrazine display enhanced rates of atrazine degradation....
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2012.0388
更新日期:2013-05-01 00:00:00