this paper refers to an experiment of so2 absorption to the three different sorbents: calcium-oxide (cao), calcium-carbonate (caco3) and dolomite (camg(co3)2). in the reactor under the condition of oxidation atmosphere with the mass of sorbent (sample) of 100 g with fractional composition of 500-700µm, the gas temperature varied from 200°c and 400°c. the examinations indicated that the highest ...

The oxidation of Fe(II) by molecular oxygen at nanomolar levels has been studied using a UV-Vis spectrophotometric system equipped with a long liquid waveguide capillary flow cell. The effect of pH (6.5-8.2), NaHCO3 (0.1-9 mM), temperature (3-35 degrees C), and salinity (0-36) on the oxidation of Fe(II) are presented. The first-order oxidation rates at nanomolar Fe(II) are higher than the value...

The structure of apatite, Ca10(PO4)6F2, can be described in terms of an approximate hexagonal close packed set of spheres in which each sphere represents a tetrahedral PO4 3ion. This packing has octahedral interstitial sites that form channels through the structure parallel to the hexagonal axis. The F and 4/10ths of the Ca ions are located in these channels forming columns of F and Ca ions res...

We have studied the reaction kinetics of ten manganese porphyrins, differing in their meso substituents, with peroxynitrite (ONOO-) and carbonate radical anion (CO3.) using stopped-flow and pulse radiolysis, respectively. Rate constants for the reactions of Mn(III) porphyrins with ONOO- ranged from 1 x 10(5) to 3.4 x 10(7) m(-1) s(-1) and correlated well with previously reported kinetic and the...

The effect of ions presence such as: Na + , K + , Ca 2+ , Cl , SO4 2and CO3 2, at various initial concentrations, on the kinetics of cadmium sorption by dried sunflower leaves was studied at 25°C in batch conditions. The presence of these ions in solution was found to inhibit the uptake of cadmium by dried sunflower leaves at different degrees. Na + and K + ions have no significant effect. For ...

In situ synchrotron diffraction measurements and subsequent Rietveld refinements are used to show that the high energy density cathode material LiCoPO4 (space group Pnma) undergoes two distinct two-phase reactions upon charge and discharge, both occurring via an intermediate Li2/3(Co2+)2/3(Co3+)1/3PO4 phase. Two resonances are observed for Li2/3CoPO4 with intensity ratios of 2:1 and 1:1 in the ...

Mg-Al-CO3 Layered double hydroxide (LDH) was prepared by co-precipitation method at constant pH, and subsequently used to remove Evans Blue (EB) and Yellow thiazole (YT) dyes from aqueous solutions. The obtained material was characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), thermal analysis and BET. The kinetic and equilibrium aspects of sorption ...

The complexation of Cm(III) with transferrin is investigated in the pH range from 3.5 to 11.0 in the absence of carbonate and at c(carbonate)tot = 25 mM. In the absence of carbonate two Cm(III) transferrin species I and II are formed depending on pH. An increase of the total carbonate concentration favors the formation of the Cm(III) transferrin species II with Cm(III) bound at the Fe(III) bind...

Stable oxygen isotope ratios of foraminiferal calcite are widely used in paleoceanography to provide a chronology of temperature changes during ocean history. It was recently demonstrated that the stable oxygen isotope ratios in planktonic foraminifera are affected by changes of the seawater chemistry carbonate system: the dO of the foraminiferal calcite decreases with increasing CO3 22 concent...