ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of aqueous chemistry on the binding polycyclic aromatic hydrocarbons by dissolved humic materialsMark A. Schlautman and James J. MorganCite this: Environ. Sci. Technol. 1993, 27, 5, 961–969Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 1993https://pubs.acs.org/doi/10.1021/es00042a020https://doi.org/10.1021/es00042a020research-articleACS PublicationsRequest reuse permissionsArticle...

Sorption isotherms for a hydrophobic solute probe, phenanthrene, were measured experimentally 27 different soils and sediments. The linear Freundlich isotherm models the Dual Reactive Domain Model (DRDM) used to fit resulting data. results reveal all sediments studied that (i) model DRDM data well, whereas fails do so; (ii) values of organic carbon-normalized distribution coefficient, KOC, calculated from individual points specific sorbent−solute system vary significantly with aqueous-phase...

ABSTRACT Recent molecular modeling and spectroscopic studies have suggested that relatively strong interactions can occur between aromatic π donors metal cations in aqueous solutions. The objective of this study was to characterize potential cation–π exchangeable accumulated at mineral surfaces via both batch sorption methods. Quadrupolar splitting deuterium nuclear magnetic resonance ( 2 H NMR) spectroscopy for d –dichloromethane, 6 –benzene, 8 –toluene (C D 5 – moiety) suspensions a...

Phenanthrene sorption by eight particulate mineral solids was examined. The polar surfaces of these inorganic comprised three general types with respect to particle structure; namely, (i) the external non-porous α-Al2O3, quartz, kaolinite, and amorphous SiO2, (ii) internal pore mesoporous silica gels, (iii) interlayer a swelling bentonite clay. Our experimental data reveal that equilibrium is attained rapidly for all sorbents studied; isotherms other than are linear; have surface-area-based...

This article presents the results of a survey conducted to determine practices currently being utilized by drinking water practitioners and researchers measure dissolved organic carbon (DOC) concentrations ultraviolet (UV) absorbances that are also used for specific UV‐absorbance (SUVA) determinations. Overall show general compliance with current US Environmental Protection Agency (USEPA) requirements, but there major differences among in areas where no USEPA guidelines or recommendations...

Changes in selected spectroscopic and chromatographic characteristics of water-soluble organic matter (WSOM) extracted from leaf litter its ability to bind pyrene were monitored throughout 14 day microbial incubation experiments. To provide additional insight into the transformation WSOM, experiments similarly conducted with controlled-composition mixtures glucose dissolved humic substances (HS) that base same source. Microbial increased specific ultraviolet absorbance number-average...

Soil makes important contributions to the United Nations (UN) Land Degradation Neutrality (LDN) concept and targets; however, currently, soil is not integrated into measurable information (e.g., indicators, metrics) monitor land degradation (LD) patterns trends. This study examines role of in LDN UN Convention Combat Desertification (UNCCD), Sustainable Development Goal (SDG 15: Life on Land). specifically focused biodiversity loss as they relate an indicator 15.3.1 Proportion that degraded...

Partitioning of two hydrophobic organic compounds (HOCs), phenanthrene and naphthalene, to surfactant micelles, kaolinite, sorbed surfactants was studied provide further insight on (1) the effectiveness using remove HOCs from water (2) feasibility surfactant-enhanced remediation (SER) for contaminated subsurface systems. Sorbed partition coefficients, Kss, showed a strong dependence sorption isotherms: at low levels Kss values were their highest then decreased with increasing densities. SDS...

The adsorption of nine different natural and synthetic macromolecular dissolved organic materials (DOMs) by granular activated carbon (GAC) was investigated under anoxic conditions to elucidate the relative influence molecular properties. In particular, attempts were made better understand respective roles DOM size chemical structure. Anoxic chosen because additional complications caused presence oxygen; latter issue is addressed in a companion paper. For chemically homogeneous model DOM,...

Removal of hydrophobic organic contaminants (HOCs) from saturated low-permeability subsurface environments using a solubility-enhanced electrokinetic remediation process is demonstrated for model system. Phenanthrene, hydroxypropyl-β-cyclodextrin (HPCD), and kaolinite were selected as representative HOC, HOC solubility-enhancing agent, clay soil, respectively. Electrokinetic (EK) column experiments conducted under various operating conditions, the results interpreted in terms EK properties...

Core Ideas An ESRI Story Map (a web application based on maps) was developed and tested for teaching topography. Student evaluations of the were positive. Maps can be an effective learning tool. Environmental Systems Research Institute (ESRI) are applications maps other multimedia, which effectively used in soil science education. The purpose this study to develop “Soil Forming Factors: Topography” introductory courses assess performance newly story map using ESRI's “five principles...

Soil ecosystem services (ES) (e.g., provisioning, regulation/maintenance, and cultural) disservices (ED) are dependent on soil diversity/pedodiversity (variability of soils), which needs to be accounted for in the economic analysis business decision-making. The concept pedodiversity (biotic + abiotic) is highly complex can broadly interpreted because it formed from interaction atmospheric diversity (abiotic biotic), biodiversity (biotic), hydrodiversity lithodiversity (abiotic) within...

The heterogeneity within a bulk humic substance (HS) was investigated for ultrafiltration (UF) fractions of purified Aldrich acid (PAHA) using specific ultraviolet absorbance (SUVA), weight- and number-average molecular weights (MWw MWn), organic carbon-normalized pyrene binding coefficients (Koc). As expected, variations in these selected operational descriptors were found the PAHA UF fractions, but smaller than ranges observed small subset different aquatic terrestrial HS. In general,...

Seventeen filter membranes produced from eight membrane materials by four major manufacturers were evaluated for dissolved organic carbon (DOC) and ultraviolet (UV 254 ) absorbance measurements thus specific UV determinations. Hydrophilic polyethersulfone filters two a hydrophilic polypropylene the best options among tested complying with US Environmental Protection Agency's Disinfectants/Disinfection By‐products Rule. These should be rinsed minimum of 30 mL distilled deionized water/cm 2...

Removal of hexavalent chromium, Cr(VI), from an artificial groundwater by two commercially available granular activated carbons (GACs) was investigated in batch and continuous‐flow column studies. Experimental parameters examined included solution pH, presence dissolved oxygen (DO), GAC pretreatment with reducing agents. As pH increased 4 to 7.5, the amount Cr(VI) removed both GACs decreased significantly. DO experimental systems enhanced performance, but reductants (ferrous iron or...