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Abstract Cloud point extraction is a separation and preconcentration procedure that has been extensively applied for trace metal determination in several different matrices. Its major advantages are simple experimental procedures, low cost, high preconcentration factors, and environmental safety. These aspects include it in a set of analytical methods in agreement with the “green chemistry” principles. The surfactants characteristics and the process of micelle formation are outlined for a better understanding of the technique. After general considerations about the cloud point extraction basis and its extraction mechanism for metal chelates are considered, selected spectroanalytical techniques and their application for analysis of the micellar phase are discussed. The micellar extraction in metal speciation analysis, the on‐line incorporation of cloud point extraction to flow injection analysis, and coupling with capillary electrophoresis are described. 相似文献
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Rhodamine B 8-hydroxy-2-quinolinecarboxaldehyde Schiff base (1) has been investigated as a colorimetric and fluorescent “off-on” probe for the recognition of Cu2+ in aqueous solution. Probe 1 was synthesized by condensation of rhodamine B hydrazide and 8-hydroxy-2-quinolinecarboxaldehyde, which exhibited good selectivity for Cu2+ among a range of biologically and environmentally important metal ions. The Cu2+ recognition event undergoes a Cu2+ promoted hydrolysis of probe 1 to release rhodamine B and the recognition process is barely interfered by other coexisting metal ions. Figure
New application of Rhodamine B 8-hydroxy-2-quinolinecarboxaldehyde Schiff base as a colorimetric and fluorescent “off-on” probe for Cu2+ in CH3CN-H2O (1:1, v/v, HEPES 10 mM, pH?=?7.0) solution has been developed 相似文献
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Growth of MgB2 Thin Films by Chemical Vapour Deposition Using B2H6 as a boron Source 总被引:1,自引:0,他引:1 下载免费PDF全文
《中国物理快报》2003,20(8):1356-1358
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E. A. Ershov‐Pavlov K. Yu. Katsalap K. L. Stepanov Z. Mijatović S. Djurović D. Nikolić 《Journal of Applied Spectroscopy》2002,69(3):459-466
The transverse distribution of the plasma temperature in the positive column of a d.c. cascade arc in argon at atmospheric pressure has been measured. The measurements have been carried out by the conventional method involving the determination of the emissivity of plasma as well as directly from the radiation spectrum of the arc without recourse to the Abelian inversion. A theoretical and model justification of the applicability of the second method is given. The results of the determination of the temperature profile in the observation direction by the width and shift of the ArI 425.9nm line selected for the diagnostics are presented. An analysis of the data obtained supports the possibility of determining the temperature of an inhomogeneous, optically thin plasma from the profiles of lines in the emission spectrum. 相似文献