Authors:A. Moitinho, E. Ionashiro, G. de Souza, and F. Fertonani
Solid-state M-EDTA chelates, where M represents the divalent ions Mg(II), Ca(II), Sr(II) or Ba(II) and EDTA is ethylenediaminetetraacetate
anion, were synthesized. Thermogravimetry, derivative thermogravimetry (TG, DTG), differential scanning calorimetry (DSC)
and X-ray diffraction powder patterns have been used to characterize and to study the thermal behaviour of these chelates.
The results provided information concerning the stoichiometry, crystallinity, thermal stability and thermal decomposition.
The thermal decompositions of dehydrated or anhydrous bivalent transition metal (Mn, Fe, Co, Ni, Cu, Zn, Cd) and alkali rare
metal (Mg, Ca, Sr, Ba) methanesulfonates were studied by TG/DTG, IR and XRD techniques in dynamic Air at 250–850 °C. The initial
decomposition temperatures were calculated from TG curves for each compound, which show the onsets of mass loss of methanesulfonates
were above 400 °C. For transition metal methanesulfonates, the pyrolysis products at 850 °C were metal oxides. For alkali
rare metal methanesulfonates, the pyrolysis products at 850 °C of Sr and Ba methanesulfonates were sulphates, while those
of Mg and Ca methanesulfonate were mixtures of sulphate and oxide.
Authors:S. Arvelakis, F. Frandsen, and K. Dam-Johansen
The ash behaviour comprises one major obstacle towards the efficient utilization of municipal solid wastes, (MSW), in incineration
plants. The presence of large amounts of inorganic constituents such as alkali and alkali earth metals, chlorine, sulfur and
zinc increase significantly the ash reactivity and lead to severe ash-related problems such as fouling, slagging, corrosion
and erosion during their thermal treatment. In this paper, the melting behaviour of various ash fractions originating from
the incineration of MSW is studied using simultaneous, (DSC/TG), thermal analysis methods. The produced results provide the
basis for improved modelling of the ash behaviour during the incineration of MSW.
Authors:Debasis Das, S. Ansari, P. Mohapatra, G. Mary, K. Radhakrishnan, S. Tripathi, and V. Manchnada
Ion-chromatography (IC) as well as high performance liquid chromatography (HPLC) techniques have been used as analytical tools
for the separation and estimation of some of the relevant metal ions present in the high level liquid waste (HLLW). IC was
applied for the estimation of alkali and alkali earth metal ions, viz. Na, Cs, Ba and Sr using methane sulphonic acid as the
eluent on a cation exchange column. On the other hand, dynamically modified (with sodium salt of n-octane sulphonic acid) reverse phase HPLC was followed for the estimation of lanthanides viz. La, Pr, Nd and Sm using α-hydroxy
isobutyric acid as the eluent on a C-18 column. Sample acidity of 0.01 M HNO3 was optimized for best analytical results. The interferences of one group of metal ions on the quantification of the other
group of metal ions were studied. The solvent extraction data (distribution coefficient data) of Na, Cs, Sr, Ba, La, Pr, Nd
and Sm from their mixture was obtained by analyses of the aqueous samples before and after extraction with extractants used
for actinide partitioning, viz., octyl(phenyl)N,N-diisobutyl carbamoyl methylene phosphine oxide (CMPO), N,N′-dimethyl-N,N′-dibutyl tetradecyl malonamide (DMDBTDMA) and N,N,N′,N′-tetraoctyl diglycolamide (TODGA). The solvent extraction data obtained by IC/HPLC techniques was compared with those obtained
by ICP-AES technique. A good agreement between the results of the two techniques validated the present analytical method.
Authors:Hideki Kurokawa, Masashi Yanai, Masa-aki Ohshima, and Hiroshi Miura
]. It is well known that typical solid bases, i.e., alkali-earthmetal oxides, promote the isomerization of 1-butene, hydrogenation of 1,3-butadiene, aldol condensation of acetone, and Michael addition of methyl crotonate [ 1 ]. Although many
Authors:S. Genieva, S. Turmanova, A. Dimitrov, P. Petkov, and L. Vlaev
acid—3.27% and d -galactose—2.37% [ 4 – 6 ]. The chemical analysis of the inorganic part in rice husks showed that the main component is amorphous silica and small amount from some oxides of alkali, alkaliearthmetals, aluminium, and iron. These husks