Aluminum extraction studies with

Inorganic extractables/leachables would include metals and other trace elements such as silica, sodium, potassium, aluminum, calcium, and zinc associated with glass packaging systems. Analytical techniques for the trace analysis of these elements are well established and include inductively coupled plasma—atomic emission spectroscopy (ICP-AES), ICP-MS, graphite furnace atomic absorption spectroscopy (GFAAS), electron microprobe, and X-ray fluorescence. Applications of these techniques have been reviewed by Jenke. " An example of an extractables study for certain glass containers is presented by Borchert et al. ". ... 

A review of the published literature for AP -humic interactions reflects variations in fluorescence behavior (8-12,14,15). Sposito and co-workers (11,12) concluded that there was a quenching effect for aluminum ion complexed with a chestnut leaf litter extract (LLE). Philpot et al. (14) also reported fluorescence quenching of humic acid (Aldrich) upon complexation with aluminum. However, unlike these studies, Plankey and Patterson (8-10) found that the fluorescence intensity... 

Since in previous studies (3,4) we found that the NO conversion is related to the presence of Aliv sites of the zeolitic structure, it is possible to assume that the origin of the deactivation observed is, in part, due to the loss of these sites by dealumination. Together with the loss of active sites, the aluminum extracted from the network could block the channels of the mordenite, thus affecting the adsorption and diffusion properties. 

Table 2 shows the results of ethylene diffusivity values together with NOx conversion for the different H-mordenites studied in this work. Note that while D/R2 decreases an order of magnitude in the deactivated sample (if compared with the fresh one), it remains approximately constant for the samples subjected to acidic dealumination. This result suggests that the aluminum extracted from the lattice of the mordenite during of the mordenitic structure along the for the deactivation observed in the... 

Researchers further optimized purification of a model ATRP reaction using the same automated parallel synthesizer that was outfitted with a solid-phase extraction (SPE) unit that utilizes silica gel or aluminum oxide filtration cartridges that can interface with synthesizer s liquid-dispensing system. The polymerization of MMA with p-toluenesulfonyl chloride (TsCl) as the initiator and CuCl/4,4 -dinonyl 2,2 -bipyridine (dNbpy) as the catalyst was chosen as a model reaction for this study. The PMMA pol5mier of this reaction was determined to have an MW of 12 000 Da and a PDI of 1.15. Sixty-four different purification conditions were analyzed by vaiying column materials, column lengths, and eluent collected. For the model reaction, a 1.5-cm-long artivated neutral or basic aluminum oxide column with 2 ml of THF eluent was optimal. 

The major results of this study are consistent with a simple picture of mordenite catalysts. An increase in effective pore diameter, whether by extraction or exchange, will increase the rate of transport of reactant and product molecules to and from the active sites. However, aluminum ions are necessary for catalytic activity as aluminum is progressively removed by acid extraction, the number of active sites and the initial activity decrease. Coke deposition is harmful in two ways coke formation as the reaction proceeds will cause a decrease in effective pore diameter and effective diffusivity, and coke deposited on active sites will result in a chemical deactivation as well. 

In a hemolysis tube, 60 nmoles 14C DANS-C1 solution in 60 yl acetone, and 15 yl 0.5 M Na2CC>3 buffer are added either to 50 yl of the acetone solution (extraction) or to a solution of 3.18 nmoles A9-THC (yield study). Simultaneously with each test, a blank is made up under the same conditions, but without A9-THC. The tubes are stoppered, wrapped in aluminum foil and incubated for one hour at 40°C. After cooling, 18 nmoles of unlabeled DANS A9-THC (carrier),... 

Separation of TPE and REE by Extraction Chromatography - Extraction chromatography was used for the separation of trivalent TPE and REE. HDEHP was used as the stationary phase on red-kieselguhr as the inert support. Trivalent TPE and REE were loaded on the column filled with this stationary phase from dilute nitric acid. Then, the column was eluted with a solution of 0.05M DTPA-1M lactic acid at pH=3.0. Trivalent TPE were eluted from the column. The influence of aluminum ion was studied, and the pH and flow rate of elution solution and column temperature were also studied as a function of separation. 

In this section, data are presented on the effects of deacidification on (a) oxidizable material extracted from some old papers (b) changes in physical properties of these old papers and (c) changes in physical properties of several multicolored maps. The results of some experiments on the interaction of metal ions with a hardwood kraft pulp are given, and discussed in relation to deacidification and probable stability. A series of handsheets made from a hardwood kraft pulp, after treatment of the pulp with various metal ions, were studied in relation to the effects of deacidification on the removal of aluminum and on stability before and after... 

Earlier cleanup for CYMS and CYMD determination was performed by shaking with concentrated sulfuric acid [12, 21, 24]. However, later it was found that 23 CYMD and 25 CYMD degraded 100 and 50%, respectively, with sulfuric acid treatment [17]. Therefore, in later studies the extract was purified in a Pasteur pipette column packed with 2 g of neutral aluminum oxide (Merck, activity I), which was first activated at 800 °C and then deactivated with water. About 0.5 ml of a sample in hexane was added into the dry column, and the analytes were eluted out with 15 ml of hexane [17,22,23]. 

Poli F, Longo G, Parmiani S. The safety and efficacy of immunotherapy with aluminum hydroxide-adsorbed venom extract of Vespula spp. An open, retrospective study. AUergol Immunopathol (Madr)... 

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