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Lehmann M Zouboulis AI Matis KA 《Environmental pollution (Barking, Essex : 1987)》2001,113(2):121-128
The research on separation methods of toxic metals from wastewater streams is continuous and intensive and, among them, sorption processes are considered of particular importance, mainly due to their effectiveness. The sorption of chromate anions and zinc cations from dilute aqueous solutions using a packed-bed (column configuration) of synthesised granulated goethite was investigated in the present study. The examined parameters during this investigation were the following: (1) the initial pH value of metal-laden aqueous solution (two representative values at acidic pH, 3.5 and 5.0, were tested); (2) the quantity of sorbent in the column, corresponding to bed height; and (3) the influence of ethylene diamine tetra acetic acid (EDTA) addition, a common, strong chelating agent. The Bed Depth-Service Time model has been applied to the sorption results in order to model the column operation. The removal efficiency of Cr(VI) anions by the sorptive column was found to be higher than that of Zn(II) cations. The presence of EDTA caused a certain decrease of removal efficiency for the case of hexavalent chromium, due to competition for the same sorption sites, while the removal of divalent zinc was increased, due to variation of cation speciation. 相似文献
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Gas chromatography-mass spectrometry (GC-MS) methodology was developed to speciate and quantitate several degradation products
of polydimethylsiloxane (PDMS) in soil. We have demonstrated that the major degradation product,viz., dimethylsilanediol, can be readily analyzed by GC-MS without derivatization as commonly practiced in analyzing such materials.
A mixture of linear siloxane diols (n = 1–5, wheren is the number of Me2SiO units), and cyclic dimethylsiloxanes (n = 4–6) was resolved by GC-MS. We also found that peak identity of various diols required that GC-MS is done in the chemical
ionization (CI) mode, since the electron impact (EI) ionization mode produced similar mass fragmentation patterns for diols
and cyclics containing the same number of silicon atoms. For siloxane diols, detection limits ranged from 100 pg (forn = 1) to 1 ng (for n = 5). For cyclics, the detection limit was about 1 pg. Dimethylsilanediol, known to be unstable even
in the solid state, was shown by NMR techniques to be stable in aqueous solution at <0.1% concentration. A 100-ppm solution
was stable for over a year. Purity check for dimethylsilanediol is best carried out by Si-29 solid-state NMR technique. 相似文献
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