Available experimental data describing Al(III) and Fe(III) binding by fulvic and humic acids can be explained approximately by Humic Ion Binding Model VI. The model is based on conventional equilibrium reactions, involving protons, metal aquo ions and their first hydrolysis products, and binding sites ranging from abundant ones of low affinity, to rare ones of high affinity, common to all metal...

Chemicals and materials NaClO4, Pb(ClO4)2·3H2O, KClO4·3H2O, K3[Fe(CN)6], K4[Fe(CN)6], 6-mercaptohexanol, Tris(tris-(hydroxymethyl)-aminomethane), dimethyl sulfoxide (DMSO) were purchased from Sigma-Aldrich Inc. Ethylenediamine tetraacetic acid (EDTA), Ethylenediamine tetraacetic acid dipotassium salt (EDTA-2K) were purchased from J&K Scientific Ltd. Mg(ClO4)2 was purchased from Fluka. The oligo...

Decolorization of sunset yellow dye (SY) in an aqueous solution was investigated by Fenton reaction using H2O2/Fe 2+ system. Different parameters controlling the degradation efficiency as pH and H2O2 and Fe 2+ concentrations were evaluated. The optimal operational conditions were found to be [Fe] = 2.55x10 mmol, [H2O2] = 0.2425 mmol at pH 2.7. The study of the Kinetics of decolorization indicat...

To study the effect of different concentrations of potassium in thenutrient solution and water stress on the quality and quantity yield of Lilium LA cv.Termoli, a pot experiment was conducted based on completely randomized design in sand and perlite medium (50:50) in three levels of potassium (Kfree, 6 mM K and and 12 mM K in Hoagland solution) with three replications. In the present study, the...

This study assessed the effect of acetic NaF solutions on stainless steel orthodontic brackets. Acetic acid was added to a 0.1% NaF solution to make two solutions, one with pH 3.5 and the other with pH 6. For the two different stainless steel brackets (Tomy, Dentaurum) used in this study, they had a similar elemental composition--except with Mo (molybdenum) in the Tomy bracket. The brackets wer...

83 INTRODUCTION 83 MATERIALS AND METHODS RESULTS . . DISCUSSION CONCLUSIONS REFERENCES VI. CONCLUSIONS APPENDICES A: MODIFIED HOAGLAND SOLUTION B: ANALYSIS OF VARIANCE TABLES

FeCO3 cement can be produced by reacting CO2(aq) and particulate-Fe(0). Process conditions solution compositions influence properties through kinetics of Fe-dissolution FeCO3-precipitation. This study investigates in dilute systems (water(wt.)/Fe(wt.) = 1000) at 30/60 °C, 1/10 barg CO2-pressures. Experimentally, time-evolution composition shows increased [Fe] solution-pH. As a proxy for high-pr...

Zinc (Zn) removal by physically mixed particles of zero-valent iron (Fe) and sulfide (FeS) was investigated as one technology for Zn from waste groundwater. The effects the Fe/FeS mass ratio, including a single Fe FeS particles, pH on changes in concentrations Zn, Fe, S were examined batch test column tests, mechanism elimination discussed. Among all mixing fractions FeS, eliminated most effect...

Polyelectrolyte multilayer (PEM) films have become very popular for surface functionalization and the design of functional architectures such as hollow polyelectrolyte capsules. It is known that properties such as permeability to small ionic solutes are strongly dependent on the buildup regime of the PEM films. This permeability can be modified by tuning the ionization degree of the polycations...

Silver nanoparticles capped with mercaptoacetic acid and 2-aminoethanethiol short-chain alkanethiols were prepared by a one-step method in aqueous solution for monitoring pH and a range of heavy metal ions. The mode of transduction is optical, based on the change in aggregation of the nanoparticles in solution. Because of the different ionic interactions between the modified nanoparticles, thes...