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Donald L. Sparks
University of Delaware
AdsorptionSoil waterInorganic chemistryChemistrySorption
452Publications
81H-index
29.6kCitations
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Publications 450
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#1Beatrice Giannetta (UNITO: University of Turin)
#1Beatrice GiannettaH-Index: 2
Last. Donald L. SparksH-Index: 81
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Abstract Iron (Fe) speciation in soils is highly dependent on environmental conditions, mineralogy, and chemical interactions with soil organic matter (SOM). The fine silt and clay (FSi + Cl) particle size fraction of soils constitutes a primary organo-mineral fraction and contains SOM with long turnover time. In this study, the FSi + Cl particle size fractions isolated from a coniferous forest, a grassland, a technosol, and an agricultural soil were reacted with Fe(III) at pH 7. Unreacted and r...
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#1Donald L. Sparks (UD: University of Delaware)H-Index: 81
1 CitationsSource
The role and distribution of iron (Fe) species in physical soil fractions has received remarkably little attention in field-scale systems. Here, we identify and quantify the Fe phases in two fractions (fine sand, FSa, and fine silt and clay, FSi+Cl), isolated from an agricultural soil non-amended and amended with different organic materials, by Fe K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy. Linear combination fitting and wavelet transform of EXAFS data revealed noticeab...
1 CitationsSource
#1Tyler D. Sowers (UD: University of Delaware)H-Index: 2
#1Tyler D. SowersH-Index: 3
Last. Donald L. SparksH-Index: 81
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Permafrost contains a large (1700 Pg C) terrestrial pool of organic matter (OM) that is susceptible to degradation as global temperatures increase. Of particular importance is syngenetic Yedoma permafrost containing high OM content. Reactive iron phases promote stabilizing interactions between OM and soil minerals and this stabilization may be of increasing importance in permafrost as the thawed surface region (“active layer”) deepens. However, there is limited understanding of Fe and other soil...
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#1Audrey V. Gamble (AU: Auburn University)H-Index: 1
#2Paul A. Northrup (SBU: Stony Brook University)H-Index: 8
Last. Donald L. Sparks (UD: University of Delaware)H-Index: 81
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#1Donald L. Sparks (UD: University of Delaware)H-Index: 81
#2Lee E. Sommers (CSU: Colorado State University)H-Index: 32
Last. Gary W. Petersen (PSU: Pennsylvania State University)H-Index: 18
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#1Sabina Yeasmin (BAU: Bangladesh Agricultural University)H-Index: 4
#2Balwant Singh (USYD: University of Sydney)H-Index: 36
Last. Quan Hua (ANSTO: Australian Nuclear Science and Technology Organisation)H-Index: 1
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Abstract. Soil organic carbon (OC) is the largest terrestrial C stock and soils' capacity to preserve OC varies with many factors including land use, soil type and depth. We investigated the effect of land use change on particulate organic matter (POM) and mineral-associated organic matter (MOM) in soils. Surface (0–10 cm) and sub-surface (60–70 cm) soil samples were collected from paired-sites (native and cropped lands) of four contrasting soils. Bulk soils were isolated into POM and MOM fracti...
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#1Steven A. Banwart (University of Leeds)H-Index: 36
#2Nikolaos P. Nikolaidis (TUC: Technical University of Crete)H-Index: 30
Last. Donald L. Sparks (UD: University of Delaware)H-Index: 81
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Soil is the central interface of Earth's critical zone—the planetary surface layer extending from unaltered bedrock to the vegetation canopy—and is under intense pressure from human demand for biom...
1 CitationsSource
#1Qian Sun (CAS: Chinese Academy of Sciences)H-Index: 22
#2Cun Liu (CAS: Chinese Academy of Sciences)H-Index: 18
Last. Yu-Jun Wang (CAS: Chinese Academy of Sciences)H-Index: 28
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Abstract Apart from surface complexation, precipitation of minerals also plays an important role in reducing the mobility and transport of heavy metals in the environment. In this study, Cd(II) sorption species on surfaces of γ-Al2O3 at pH 7.5 were characterized using multiple techniques. Results show that in addition to adsorption complexes, Cd hydroxide phases (Cd(OH)2 precipitates and Cdx(OH)y polynuclear complexes) were formed at the initial stages of Cd(II) sorption and gradually transforme...
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#1Tyler D. Sowers (UD: University of Delaware)H-Index: 2
#2Kathryn L. Holden (UD: University of Delaware)H-Index: 1
Last. Donald L. Sparks (UD: University of Delaware)H-Index: 81
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Iron (oxyhydr)oxides are highly reactive, environmentally ubiquitous organic matter (OM) sorbents that act as mediators of terrestrial and aqueous OM cycling. However, current understanding of environmental iron (oxyhydr)oxide affinity for OM is limited primarily to abiogenic oxides. Bacteriogenic iron (oxyhydr)oxides (BIOs), common to quiescent waterways and soil redox transitions, possess a high affinity for oxyanions (i.e., arsenate and chromate) and suggests that BIOs may be similarly reacti...
1 CitationsSource
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