http://publicationslist.org/data/d.peak/atom.xml Derek Peakhttp://publicationslist.org/d.peak$basepathfavicon.icoRecent additions to Derek Peak's PublicationsList.org pagehttp://publicationslist.org/publications.png2018-01-26T16:40:40Z http://publicationslist.org/d.peak/refid52 2018-01-26T16:39:32Z

Adsorption and precipitation reactions often dictate the availability of phosphorus in soil environments. Tripolyphosphate (TPP) is considered a form of slow release P fertilizer in P limited soils, however, investigations of the chemical fate of TPP in soils are limited. It has been proposed that TPP rapidly hydrolyzes in the soil solution before adsorbing or precipitating with soil surfaces, but...<br/><br/>Jordan G Hamilton, Jay Grosskleg, David Hilger, Kris Bradshaw, Trevor Carlson, Steven D Siciliano, Derek Peak (2018) <i>Geochemical transactions</i> <i></i> <i></i> 19: 1 <br/>

http://publicationslist.org/d.peak/refid49 2018-01-26T16:39:32Z

Linear tripolyphosphates (TPP) are used extensively in liquid fertilizers though little is known about their chemical fate after sorption on mineral surfaces. The initial rapid adsorption of TPP to metal oxide surfaces has been observed, but it is not known whether this adsorption will catalyze or inhibit TPP hydrolysis. To determine the effects of adsorption upon TPP hydrolysis, batch reactors we...<br/><br/>Jordan G Hamilton, David Hilger, Derek Peak (2017) <i>Journal of colloid and interface science</i> <i></i> <i></i> 491: 190-198<br/>

http://publicationslist.org/d.peak/refid53 2018-01-26T16:39:32Z

Phosphorus (P) bioavailability often limits gasoline biodegradation in calcareous cold-region soils. One possible method to increase P bioavailability in such soils is the addition of citrate. Citrate addition at the field scale may increase hydrocarbon degradation by: (i) enhancing inorganic and organic P dissolution and desorption, (ii) increasing hydrocarbon bioavailability, and/or (iii) stimul...<br/><br/>Tingting Chen, Courtney Philips, Jordan Hamilton, Blaine Chartbrand, Jay Grosskleg, Kris Bradshaw, Trevor Carlson, Karen Timlick, Derek Peak, Steven D Siciliano (2017) <i>Journal of environmental quality</i> <i></i> <i></i> 46: 5 975-983<br/>

http://publicationslist.org/d.peak/refid51 2018-01-26T16:39:32Z

In confined animal feeding operations, such as dairies, manure is amended to soils at high rates leading to increases in P and organic matter in the soils. Phosphorus reacts with soil-Ca to form Ca-P minerals, which controls P availability for leaching and transport through the watershed. In this research, the effects of manure sourced dissolved organic matter (DOM) on P sorption on calcite were m...<br/><br/>Eva Weyers, Daniel G Strawn, Derek Peak, Leslie L Baker (2017) <i>Chemosphere</i> <i></i> <i></i> 184: 99-105<br/>

http://publicationslist.org/d.peak/refid47 2016-05-04T20:04:49Z

Managing phosphorus bioaccessibility is critical for the bioremediation of hydrocarbons in calcareous soils. This paper explores how soil mineralogy interacts with a novel biostimulatory solution to both control phosphorus bioavailability and influence bioremediation. Two large bore infiltrators (1 m diameter) were installed at a PHC contaminated site and continuously supplied with a solution cont...<br/><br/>Steven D Siciliano, Tingting Chen, Courtney Phillips, Jordan Hamilton, David Hilger, Blaine Chartrand, Jay Grosskleg, Kris Bradshaw, Trevor Carlson, Derek Peak (2016) <i>Environmental science & technology</i> <i></i> <i></i> : <br/>

http://publicationslist.org/d.peak/refid48 2016-05-04T20:04:49Z

HudBay Minerals, Inc., has mined and/or processed Zn and Cu ore in Flin Flon, MB, Canada, since the 1930s. The boreal forest ecosystem and soil surrounding these facilities have been severely impacted by mixed metal contamination and HSO deposition. Zinc is one of the most prevalent smelter-derived contaminants and has been identified as a key factor that may be limiting revegetation. Metal toxici...<br/><br/>Jordan G Hamilton, Richard E Farrell, Ning Chen, Renfei Feng, Joel Reid, Derek Peak (2016) <i>Journal of environmental quality</i> <i></i> <i></i> 45: 2 684-692<br/>

http://publicationslist.org/d.peak/refid50 2017-07-28T16:20:59Z

Anthropogenic activities at the HudBay Minerals, Inc., Flin Flon (Manitoba, Canada) mining and processing facility have severely affected the surrounding boreal forest ecosystem. Soil contamination occurred via a combination of metal and sulfuric acid deposition and has resulted in forest dieback and ineffective natural recovery. A community-led effort to revegetate areas of the landscape through ...<br/><br/>Jordan G Hamilton, Richard E Farrell, Ning Chen, Joel Reid, Renfei Feng, Derek Peak (2016) <i>Journal of environmental quality</i> <i></i> <i></i> 45: 6 1894-1900<br/>

http://publicationslist.org/d.peak/refid45 2018-01-26T16:40:30Z

Synchrotron-based soft-X-ray scanning transmission X-ray microscopy (STXM) has the potential to provide nanoscale resolution of the associations among biological and geological materials. However, standard methods for how samples should be prepared, measured, and analyzed to allow the results from these nanoscale imaging and spectroscopic tools to be scaled to field scale biogeochemical results ar...<br/><br/>James J Dynes, Tom Z Regier, Ian Snape, Steven D Siciliano, Derek Peak (2015) <i>Environmental science & technology</i> <i></i> <i></i> 49: 2 1035-1042<br/>

http://publicationslist.org/d.peak/refid46 2018-01-26T16:40:30Z

An in vitro gastrointestinal model was used to explore the role of solid-liquid separation method on the bioaccessibility of trace elements in a smelter-impacted soil (NIST-2711) from Helena, MT and a mine overburden from an open-pit gold and silver mine in Mount Nansen, YK (YK-OVB). Separation methods studied included centrifugation (5,000 g, 12,000 g), syringe microfiltration (0.45 μm), and ult...<br/><br/>Brian D Laird, Blake Weiseth, Sara R Packull-McCormick, Derek Peak, Matt Dodd, Steven D Siciliano (2015) <i>Chemosphere</i> <i></i> <i></i> 134: 544-549<br/>

http://publicationslist.org/d.peak/refid44 2014-05-27T17:48:36Z

R J Green, D Peak, A J Achkar, J S Tse, A Moewes, D G Hawthorn, T Z Regier (2014) <i>Physical review letters</i> <i></i> <i></i> 112: 12 <br/>

http://publicationslist.org/d.peak/refid41 2013-11-27T15:37:40Z

In-situ aqueous solutions containing copper-ligand mixtures were measured at the Cu L-edge using X-ray absorption near edge structure (XANES) and with Attenuated Total Reflectance Infrared (ATR-FTIR) spectroscopies. Copper complexation with environmentally relevant ligands such as EDTA, citrate, and malate provided a bridge between spectroscopic studies and general environmental behavior, and will...<br/><br/>Courtney Leigh Phillips, Tom Z Regier, Derek Peak (2013) <i>Environmental science & technology</i> <i></i> <i></i> : <br/>

http://publicationslist.org/d.peak/refid43 2013-11-27T15:37:40Z

Molecular-level understanding of soil Cu speciation and distribution assists in management of Cu contamination in mining sites. In this study, one soil sample, collected from a mining site contaminated since 1950s, was characterized complementarily by multiple synchrotron-based bulk and spatially resolved techniques for the speciation and distribution of Cu as well as other related elements (Fe, C...<br/><br/>Jianjun Yang, Jin Liu, James J Dynes, Derek Peak, Tom Regier, Jian Wang, Shenhai Zhu, Jiyan Shi, John S Tse (2013) <i>Environmental science and pollution research international</i> <i></i> <i></i> : <br/>

http://publicationslist.org/d.peak/refid42 2013-11-27T15:37:40Z

Biochars produced from meat and bonemeal (MBM) waste materials contain large amounts of calcium phosphate and are potentially useful sorbents for the remediation of metals. Because the reactivity of biochars depends strongly upon the conditions used in their production, the objective of this study was to evaluate the rates and mechanisms of Zn sorption onto a commercially supplied MBM biochar prio...<br/><br/>Aaron R Betts, Ning Chen, Jordan G Hamilton, Derek Peak (2013) <i>Environmental science & technology</i> <i></i> <i></i> : <br/>

http://publicationslist.org/d.peak/refid26 2012-09-18T21:12:26Z

Ferrihydrite is a common iron hydroxide nanomineral commonly found in soils, sediments, and surface waters. Reactivity with this important environmental surface often controls the fate and mobility of both essential nutrients and inorganic contaminants. Despite the critical role of ferrihydrite in environmental geochemistry, its structure is still debated. In this work, we apply bulk sensitive Fe ...<br/><br/>Derek Peak, Tom Regier (2012) <i>Environ Sci Technol</i> <i></i> <i></i> 46: 6 3163-3168<br/>

http://publicationslist.org/d.peak/refid25 2012-02-09T01:33:24Z

Desorption and dissolution often control the mobility and availability of phosphorus (P) in the natural environment. In this study, P desorption was compared from a soil receiving either long-term inorganic or biosolid fertilization as a part of a long-term field scale research project. A continuous-flow desorption method was used to measure cumulative P desorption over time, and P K-edge X-ray ab...<br/><br/>Derek Peak, Gourango Kar, Lakhwinder Hundal, Jeff Schoenau (2012) <i>Soil Science</i> <i></i> <i>http://journals.lww.com/soilsci/Fulltext/publishahead/Kinetics_and_Mechanisms_of_Phosphorus_Release_in_a.99811.aspx</i> Publish Ahead of Print: <br/>

http://publicationslist.org/d.peak/refid24 2012-09-18T21:12:26Z

The toxicity of selenium in fish is influenced by its chemical speciation and the exposure route. In the natural environment, selenium exposure to fish occurs primarily in the form of selenomethionine in diet. Thus, the main objective of this study was to examine the tissue-specific selenium burden and speciation in fish exposed to elevated dietary selenomethionine. Rainbow trout (Oncorhynchus myk...<br/><br/>Sougat Misra, Derek Peak, Ning Chen, Charmain Hamilton, Som Niyogi (2012) <i>Comp Biochem Physiol C Toxicol Pharmacol</i> <i></i> <i></i> 155: 4 560-565<br/>

http://publicationslist.org/d.peak/refid32 2012-07-06T05:26:40Z

The comments of Manceau on our recent publication (1) correctly focus on some of the challenges involved in applications of spectroscopy to determine the structure of ferrihydrite. His two major criticisms are that perhaps our synthesis methods influenced the structure of the 2-line ferrihydrite we measured, and that an alternative explanation based on theoretical calculations should also be consi...<br/><br/>Derek Peak, Tom Z Regier (2012) <i>Environ Sci Technol</i> <i></i> <i></i> 46: 12 6885-6887<br/>

http://publicationslist.org/d.peak/refid33 2012-08-13T18:18:30Z

T Z Regier, A J Achkar, D Peak, J S Tse, D G Hawthorn (2012) <i>Nat Chem</i> <i></i> <i>http://dx.doi.org/10.1038/nchem.1430</i> advance online publication: <br/>

http://publicationslist.org/d.peak/refid36 2012-12-14T15:25:56Z

There is limited information on how manure and inorganic fertilizer application in a concentrated band impacts the solubility, mobility, and transformation of the phosphate compounds in Canadian prairie soils. A combination of resin membrane probes, sequential chemical extraction, and synchrotron based techniques were used to reveal the spatial distribution and chemical speciation of soil phosphor...<br/><br/>Gourango Kar, Derek Peak, Jeff J Schoenau (2012) <i>Soil Sci. Soc. Am. J.</i> <i></i> <i>https://www.soils.org/publications/sssaj/abstracts/76/6/2297</i> 76: 6 2297-2306<br/>

http://publicationslist.org/d.peak/refid35 2012-10-22T02:17:58Z

T Z Regier, A J Achkar, D Peak, J S Tse, D G Hawthorn (2012) <i>Nat Chem</i> <i></i> <i></i> 4: 10 765-766<br/>

http://publicationslist.org/d.peak/refid34 2012-09-18T21:12:26Z

We appreciate the concern that has been expressed by Hocking and collaborators regarding the use of linear combination fitting to extract information from the L-edge spectra of Ferrihydrite. We also share these concerns, which was the reason that we only make a rough estimate on the amount of tetrahedrally coordinated Fe(III) in ferrihydrite. We would like to take this opportunity to present some ...<br/><br/>Derek Peak, Tom Z Regier (2012) <i>Environ Sci Technol</i> <i></i> <i></i> : <br/>

http://publicationslist.org/d.peak/refid1 2011-10-11T03:30:02Z

Site-specific risk assessments often incorporate the concepts of bioaccessibility (i.e., contaminant fraction released into gastrointestinal fluids) or bioavailability (i.e., contaminant fraction absorbed into systemic circulation) into the calculation of ingestion exposure. We evaluated total and bioaccessible metal concentrations for 19 soil samples under simulated stomach and duodenal condition...<br/><br/>Brian D Laird, Derek Peak, Steven D Siciliano (2011) <i>Environ Sci Technol</i> <i></i> <i></i> 45: 9 4139-4144<br/>

http://publicationslist.org/d.peak/refid23 2011-11-25T03:17:23Z

Sequential chemical extraction is a common analytical approach used to separate soil P into operationally defined fractions based on solubility in increasingly strong extractants. However, there are some concerns that the relationship between these operationally defined pools and the true chemical speciation of P may not always be correct. This study was conducted to compare the speciation of P in...<br/><br/>Gourango Kar, Lakhwinder S Hundal, Jeff J Schoenau, Derek Peak (2011) <i>Soil Science</i> <i></i> <i>http://journals.lww.com/soilsci/Fulltext/2011/11000/Direct_Chemical_Speciation_of_P_in_Sequential.4.aspx</i> 176: 11 589-595<br/>

http://publicationslist.org/d.peak/refid22 2012-02-09T01:29:58Z

Photoreduction is a major obstacle for using the X-ray absorption near-edge structure (XANES) fingerprint to perform metal speciation at the molecular level in biological and environmental samples, especially for metalloproteins. In this study, soft X-ray induced photoreduction was observed in organic Cu(II) compounds during XANES measurements in a third-generation synchrotron source. Next Cu L(3)...<br/><br/>Jianjun Yang, Tom Regier, James J Dynes, Jian Wang, Jiyan Shi, Derek Peak, Yidong Zhao, Tiandou Hu, Yingxu Chen, John S Tse (2011) <i>Anal Chem</i> <i></i> <i></i> 83: 20 7856-7862<br/>

http://publicationslist.org/d.peak/refid3 2011-06-16T17:00:59Z

Percent arsenic bioaccessibility is occasionally dependent upon arsenic concentration; however, the mechanism(s) of this relationship has not yet been defined. To evaluate the mechanism of this relationship, the arsenic bioaccessibility from freshly synthesized poorly crystalline scorodite was measured in the stomach, small intestine, and colon stages of the Simulator of the Human Intestinal Micro...<br/><br/>Brian D Laird, Derek Peak, Steven D Siciliano (2010) <i>J Environ Sci Health A Tox Hazard Subst Environ Eng</i> <i></i> <i></i> 45: 6 732-739<br/>

http://publicationslist.org/d.peak/refid2 2011-06-16T17:00:59Z

Selenium (Se) is an essential element, but causes toxic effects in fish at a slightly elevated level beyond the threshold. However, the degree of Se toxicity differs depending on the chemical forms of Se (e.g., organic vs. inorganic) to which fish are exposed to. The mechanisms of Se metabolism and toxicity in fish, particularly at cellular level, are poorly understood. The present study was desig...<br/><br/>Sougat Misra, Derek Peak, Som Niyogi (2010) <i>Metallomics</i> <i></i> <i></i> 2: 10 710-717<br/>

http://publicationslist.org/d.peak/refid4 2011-06-16T17:00:59Z

In vitro gastrointestinal models, used to measure the metal(loid) bioaccessibility for site specific risk assessment, are typically operated under fasted conditions. We evaluated the hypothesis that fed conditions increase arsenic bioaccessibility on three reference soils (NIST 2711, NIST 2709, and BGS 102) and the bulk and <38 mum size fractions of a mine tailing. The three nutritional states inc...<br/><br/>Brian D Laird, Jacky Yeung, Derek Peak, Steven D Siciliano (2009) <i>Environ Sci Technol</i> <i></i> <i></i> 43: 22 8652-8657<br/>

http://publicationslist.org/d.peak/refid14 2011-06-16T17:10:32Z

Although widely investigated in relation to acid mine drainage systems at pH?>?1.0, we know little about the impact of sulfuric acid (H2SO4) on the geochemistry and mineralogy of clays at pH?<?1.0 (including negative pH values). Thus, laboratory batch experiments were conducted on three mixed clay samples with different mass ratios of phyllosilicates (smectite, illite, and kaolinite) to investiga...<br/><br/>Sean A Shaw, Derek Peak, M Jim Hendry (2009) <i>Geochimica et Cosmochimica Acta</i> <i></i> <i>http://www.sciencedirect.com/science/article/pii/S0016703709002117</i> 73: 14 4151-4165<br/>

http://publicationslist.org/d.peak/refid11 2011-06-16T17:05:02Z

Human exposure to contaminated soils drives clean up criteria at many urban brownfields. Current risk assessment guidelines assume that humans ingest some fraction of soil smaller than 4 mm but have no estimates of what fraction of soil is ingested by humans. Here, we evaluated soil adherence to human hands for 13 agricultural soils from Saskatchewan, Canada and 17 different soils from a brownfiel...<br/><br/>Steven D Siciliano, K James, Guiyin Zhang, Alexis N Schafer, J Derek Peak (2009) <i>Environ Sci Technol</i> <i></i> <i></i> 43: 16 6385-6390<br/>

http://publicationslist.org/d.peak/refid5 2011-06-16T17:01:54Z

The fate and mobility of boric acid in the environment is largely controlled by adsorption reactions with soil organic matter and soil minerals to form surface complexes (Soil Sci Soc. Am. J. 1991, 55, 1582; Geochim. Cosmochim. Acta 2002, 67, 2551; Soil Sci. Soc. Am. J. 1995, 59, 405; Environ. Sci. Technol. 1995, 29, 302). In this study, boric acid adsorption on pure am-Al(OH)3 and 5% (w/w) humic ...<br/><br/>Dani Xu, Derek Peak (2007) <i>Environ Sci Technol</i> <i></i> <i></i> 41: 3 903-908<br/>

http://publicationslist.org/d.peak/refid19 2011-06-16T17:13:21Z

A combination of macroscopic experiments and in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy was used to study Cd(II)-sulfate interactions on the goethite-water interface. The presence of SO4 dramatically promoted Cd adsorption at lower pH (pH 5.5-6.5) and had a smaller effect at higher pH. ATR-FTIR studies indicated sulfate adsorption on goethite occurred ...<br/><br/>G Y Zhang, D Peak (2007) <i>Geochimica et Cosmochimica Acta</i> <i></i> <i>http://www.sciencedirect.com/science/article/pii/S0016703707000488</i> 71: 9 2158-2169<br/>

http://publicationslist.org/d.peak/refid16 2011-06-16T17:10:32Z

Recent studies have applied surface complexation models (SCMs) to describe metal adsorption by mesophilic bacteria. However, only one SCM has been developed for metal biosorption by a thermophile and the study was limited to adsorption of Cd. In this study, we quantify adsorption of a variety of metals onto the thermophile Anoxybacillus flavithermus with surface complexation modeling. We conduct ...<br/><br/>Peta-Gaye G Burnett, Kim Handley, Derek Peak, Christopher J Daughney (2007) <i>Chemical Geology</i> <i></i> <i>http://www.sciencedirect.com/science/article/pii/S0009254107003191</i> 244: 3-4 493-506<br/>

http://publicationslist.org/d.peak/refid7 2011-06-16T17:03:32Z

It is well known that dissolved organic matter (DOM) increases in lakes associated with forestry activity but characterization of the DOM structure is incomplete. Twenty-three lakes with a wide range of forestry activities located in central Quebec, Canada were sampled and analyzed for dissolved organic carbon (DOC) concentration, DOC fluorescence, and ultra violet-visible (UV-VIS) absorption spec...<br/><br/>N J O'Driscoll, S D Siciliano, D Peak, R Carignan, D R S Lean (2006) <i>Sci Total Environ</i> <i></i> <i></i> 366: 2-3 880-893<br/>

http://publicationslist.org/d.peak/refid6 2011-06-16T17:03:32Z

Sorption processes at the mineral/water interface typically control the mobility and bioaccessibility of many inorganic contaminants such as oxyanions. Selenium is an important micronutrient for human and animal health, but at elevated concentrations selenium toxicity is a concern. The objective of this study was to determine the bonding mechanisms of selenate (SeO4(2-) and selenite (SeO3(2-) on h...<br/><br/>Derek Peak (2006) <i>J Colloid Interface Sci</i> <i></i> <i></i> 303: 2 337-345<br/>

http://publicationslist.org/d.peak/refid15 2012-03-08T19:38:28Z

There is international interest today in the fate and transformation of phosphorus (P) applied to soils due to historical overapplication of P from organic wastes. This overapplication has increased soil solution P concentrations and enriched the erodible fraction of soil with P. This is of major concern as significant water quality deterioration can occur if P applied to soils in organic wastes ...<br/><br/>Gurpal S Toor, Stefan Hunger, J Derek Peak, J Thomas Sims, Donald L Sparks (2006) <i></i> <i></i> <i>http://www.sciencedirect.com/science/article/pii/S0065211305890017</i> : 1-72<br/>

http://publicationslist.org/d.peak/refid18 2011-06-16T17:10:32Z

Numerous studies have utilized surface complexation theory to model proton adsorption behaviour onto mesophilic bacteria. However, few experiments, to date, have investigated the effects of pH and ionic strength on proton interactions with thermophilic bacteria. In this study, we characterize proton adsorption by the thermophile Anoxybacillus flavithermus by performing acid-base titrations and el...<br/><br/>Peta-Gaye Burnett, Hannah Heinrich, Derek Peak, Phil J Bremer, A James McQuillan, Christopher J Daughney (2006) <i>Geochimica et Cosmochimica Acta</i> <i></i> <i>http://www.sciencedirect.com/science/article/pii/S0016703706000408</i> 70: 8 1914-1927<br/>

http://publicationslist.org/d.peak/refid21 2011-06-16T17:52:18Z

Derek Peak, U K Saha, P M Huang (2006) <i>Soil Sci. Soc. Am. J.</i> <i></i> <i>https://www.agronomy.org/publications/sssaj/abstracts/70/1/192</i> 70: 1 192-203<br/>

http://publicationslist.org/d.peak/refid17 2011-06-16T17:10:32Z

Several recent studies have applied surface complexation theory to model metal adsorption behaviour onto mesophilic bacteria. However, no investigations have used this approach to characterise metal adsorption by thermophilic bacteria. In this study, we perform batch adsorption experiments to quantify cadmium adsorption onto the thermophile Anoxybacillus flavithermus. Surface complexation models ...<br/><br/>Peta-Gaye G Burnett, Christopher J Daughney, Derek Peak (2006) <i>Geochimica et Cosmochimica Acta</i> <i></i> <i>http://www.sciencedirect.com/science/article/pii/S0016703706019697</i> 70: 21 5253-5269<br/>

http://publicationslist.org/d.peak/refid12 2011-06-16T17:05:02Z

Modifying poultry diets by reducing mineral P supplementation and/or adding phytase may change the chemical composition of P in manures and affect the mobility of P in manure-amended soils. We studied the speciation of P in manures produced by broiler chickens and turkeys from either normal diets, or diets with reduced amounts of non-phytate phosphorus (NPP) and/or phytase, using a combination of ...<br/><br/>Gurpal S Toor, J Derek Peak, J Thomas Sims (2005) <i>J Environ Qual</i> <i></i> <i></i> 34: 2 687-697<br/>

http://publicationslist.org/d.peak/refid13 2011-06-16T17:10:32Z

Boron is an important micronutrient for plants, but high B levels in soils are often responsible for toxicity effects in plants. It is therefore important to understand reactions that may affect B availability in soils. In this study, Attenuated Total Reflectance Fourier transform Infrared (ATR-FTIR) spectroscopy was employed to investigate mechanisms of boric acid (B(OH)3) and borate (B(OH)4-) a...<br/><br/>Derek Peak, George W Luther III, Donald L Sparks (2003) <i>Geochimica et Cosmochimica Acta</i> <i></i> <i>http://www.sciencedirect.com/science/article/pii/S0016703703000966</i> 67: 14 2551-2560<br/>

http://publicationslist.org/d.peak/refid8 2011-06-16T17:03:32Z

While alum amendments have shown to be effective in lowering water-soluble phosphate levels in poultry litter, the mechanism by which this occurs is not fully known. To determine the solid-state speciation of phosphate in litter samples, experiments were conducted with X-ray absorption near edge structure (XANES) spectroscopy. XANES analysis reveals that, in unamended samples, phosphate is present...<br/><br/>D Peak, J T Sims, D L Sparks (2002) <i>Environ Sci Technol</i> <i></i> <i></i> 36: 20 4253-4261<br/>

http://publicationslist.org/d.peak/refid9 2011-06-16T17:03:32Z

Selenate (SeO4(2-)) is an oxyanion of environmental importance because of its toxicity to animals and its mobility in the soil environment. It is known that iron(III) oxides and hydroxides are important sorbents for SeO4(2-) in soils and sediments, but the mechanism of selenate adsorption on iron oxides has been the subject of intense debate. Our research employed Extended X-ray absorption fine st...<br/><br/>D Peak, D L Sparks (2002) <i>Environ Sci Technol</i> <i></i> <i></i> 36: 7 1460-1466<br/>

http://publicationslist.org/d.peak/refid20 2011-06-16T17:13:21Z

We used a combination of in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy and X-ray absorption fine structure (XAFS) spectroscopy to conduct molecular scale studies on Pb(II)-sulfate interactions at the solid-water interface of goethite at pH 4.5, 5.0, and 6.0. Both the ATR-FTIR studies (probing sorbed SO4 in a flow cell setup as a function of the Pb concent...<br/><br/>E J Elzinga, D Peak, D L Sparks (2001) <i>Geochimica et Cosmochimica Acta</i> <i></i> <i>http://www.sciencedirect.com/science/article/pii/S0016703701005956</i> 65: 14 2219-2230<br/>

http://publicationslist.org/d.peak/refid10 2011-06-16T17:03:32Z

The mechanism of sulfate adsorption on goethite was investigated in situ using attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. Sulfate adsorption was investigated at ionic strengths between 0.005 and 0.1 M, reactant concentrations between 5 and 500 µM, and pH values between 3.5 and 9.0. It was determined that sulfate forms both outer-sphere and inner-sphere surfac...<br/><br/> Peak, Ford, Sparks (1999) <i>J Colloid Interface Sci</i> <i></i> <i></i> 218: 1 289-299<br/>