The influence of electromagnetic fields from two commercially available water-treatment devices on calcium carbonate precipitation

CaCO3 precipitation profiles, tracked by absorbance at 350 nm, showing accelerated precipitation upon exposure of the parent solutions to a pulsed electromagnetic field (PEMF) from a commercially available device.</p

Lability of copper bound to humic acid

Geochemical speciation models generally include the assumption that all metal bound to humic acid and fulvic acid (HA, FA) is labile. However, in the current study, we determined the presence of a soluble ‘non-labile’ Cu fraction bound to HA extracted from grassland and peat soils. This was quantified by determining isotopically-exchangeable Cu (E-value) and EDTA-extraction of HA-bound Cu, separated by size-exclusion chromatography (SEC) and assayed by coupled ICP-MS. Evidence of time-dependent Cu fixation by HA was found during the course of an incubation study (160 days); up to 50% of dissolved HA-bound Cu was not isotopically exchangeable. This result was supported by extraction with EDTA where approximately 40% of Cu remained bound to HA despite dissolution in 0.05 M Na2-EDTA. The presence of a substantial non-labile metal fraction held by HA challenges the assumption of wholly reversible equilibrium which is central to current geochemical models of metal binding to humic substances

The Role of Pore Size Distribution in Competitive Adsorption on Activated Carbon

295 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999.Based on these competitive adsorption mechanisms it was proposed that in order to minimize the impact of NOM on micropollutant adsorption capacity and adsorption kinetics, the adsorbent must have a wide range of micropore sizes, including pores of similar size to the target compound.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD

The Role of Pore Size Distribution in Competitive Adsorption on Activated Carbon

295 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999.Based on these competitive adsorption mechanisms it was proposed that in order to minimize the impact of NOM on micropollutant adsorption capacity and adsorption kinetics, the adsorbent must have a wide range of micropore sizes, including pores of similar size to the target compound.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD