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11.
Mieczysław Korolczuk 《Analytical and bioanalytical chemistry》1997,357(4):389-391
A selective and sensitive method is proposed for the determination of mercury by anodic stripping voltammetry after its preconcentration
from the gas phase. Mercury from the sample solution is reduced to elemental Hg by SnCl2 and volatilized by the bubbles of a carrier gas. The gas containing mercury vapour is dried and passed through a capillary
onto a gold coated graphite electrode. An anodic stripping voltammogram is recorded from 0.1 mol/l HClO4+3×10-3 mol/l HCl solution. The calibration curve is linear from 1×10-9 to 4×10-8 mol/l Hg(NO3)2. The absolute detection limit is 0.46 ng Hg. The relative standard deviations for 4×10-9 mol/l and 2×10-8 mol/l Hg(NO3)2 are 9.8% and 6.1%, respectively (n=5).
Received: 18 December 1995/Revised: 16 April 1996/Accepted: 20 April 1996 相似文献
12.
Mieczysław Maciejewski 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(1):77-85
The feasibility of chemical bond formation, especially in the chain-transfer reaction between polymer and β-cyclodextrin (β-CD) molecules in the products of the radiation polymerization of β-CD with vinylidene chloride (VDC) its adducts has been considered. The lack of these bonds in the polymerization products of similar β-CD adducts with methyl methacrylate (MM), styrene (St), a mixture of VDC and allyl chloride (AC) and a mixture of VDC and MM (10:90 molar ratio) has been established. On the basis of the results obtained the lack of chemical bonds in the polymerization product of β-CD· VDC adduct is suggested. 相似文献
13.
Prof. Dr. Mieczysław Mąkosza 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(19):5536-5545
In this overview, it is shown that there are many initial reactions between nitroarenes and nucleophiles: addition to the electron‐deficient ring at positions occupied by halogen and hydrogen atoms, addition to the nitro group, single‐electron transfer (SET), and other types of initial reactions. The resulting intermediates react further in a variety of ways to form products of nucleophilic substitution of a halogen atom (SNAr), a hydrogen atom (SNArH), and others. Many variants of these processes are briefly discussed, particularly in relation of rates of the initial reactions and further transformations. 相似文献
14.
Drożdż Ewa Stachura Małgorzata Wyrwa Jan Rękas Mieczysław 《Journal of Thermal Analysis and Calorimetry》2015,120(1):157-166
Journal of Thermal Analysis and Calorimetry - Tetragonal zirconia (3YSZ) and cermet nickel–tetragonal zirconia (Ni/3YSZ) were obtained by citric method. The porosity of samples was increased... 相似文献
15.
Let φ be a supermultiplicative Orlicz function such that the function $t \mapsto \varphi \left( {\sqrt t } \right)$ is equivalent to a convex function. Then each complexn×n matrixT=(τ ij ) i, j satisfies the following eigenvalue estimate: $\left\| {\left( {\lambda _i \left( T \right)} \right)_{i = 1}^n } \right\|_{\ell _\varphi } \leqslant C\left\| ( \right\|\left( {\tau _{ij} } \right)_{i = 1}^n \left\| {_{_{\ell _{\varphi *} } } )_{j = 1}^n } \right\|\ell _{\bar \varphi } $ . Here, ?* stands for Young’s conjugate function of φ, ?, $\bar \varphi $ is the minimal submultiplicative function dominating φ andC>0 a constant depending only on φ. For the power function φ(t)=t p ,p≥2 this is a celebrated result of Johnson, König, Maurey and Retherford from 1979. In this paper we prove the above result within a more general theory of related estimates. 相似文献
16.
Mieczysław Jaroniec Adam W. Marczewski 《Monatshefte für Chemie / Chemical Monthly》1984,115(8-9):997-1012
A generalizedLangmuir equation is proposed for describing the monolayer adsorption of single gases on heterogeneous solids. The special cases of this equation are:Langmuir-Freundlich, Tóth andFreundlich type adsorption isotherms. The energy distribution function corresponding to this equation produces all types of simple energy distributions, i.e., symmetrical distribution, decreasing exponential distributions and asymmetrical distributions showing widening in the directions of low and high adsorption energies.
Gasadsorption auf energetisch heterogenen Feststoffen, 1. Mitt.: Eine generalisierteLangmuir-Gleichung und ihre Energieverteilung
Zusammenfassung Es wird eine generalisierteLangmuir-Gleichung zur Beschreibung der einlagigen Adsorption eines einzelnen Gases auf heterogenen Feststoffen beschrieben. Die speziellen Fälle dieser Gleichung sind:Langmuir-Freundlich-, Tóth- undFreundlich-Typ der Adsorptionsisotherme. Die Energieverteilung, die dieser Gleichung entspricht, gibt alle Typen einer einfachen Verteilung wieder, z. B. eine symmetrische Verteilung, eine abfallende exponentielle Verteilung und asymmetrische Verteilungen mit Erweiterung in die Richtung von niedriger oder hoher Adsorptionsenergie.相似文献
17.
[reaction: see text] Hydroxymethyl-substituted tetrahydrofurans were prepared with high diastereoselectivity by reaction of the carbanion derived from 3,4-epoxybutyl phenyl sulfone with aldehydes in the presence of a mixture of lithium and potassium tert-butoxides. Initial formation of aldol-type adducts is a nondiastereoselective but reversible process; thus, subsequent formation of one main diastereoisomer is controlled by the relative rates of cyclization. The configuration of the carbon stereocenter at the oxirane ring is inverted in the course of the S(N)2 process, and two new centers are created diastereoselectively. 相似文献
18.
Mieczysław Borowiecki Katarzyna Jesse-Józefczyk Elżbieta Sidorowicz 《Discrete Mathematics》2011,311(8-9):732-737
In this paper we will consider acyclic bipartition of the vertices of graphs, where acyclic means that the edges whose endpoints are in different parts of the partition induce a forest. We will require that the vertices belonging to the same partition induce graphs from particular class. We will search for acyclic bipartitions of cubic and subcubic graphs. 相似文献
19.
Sajewicz Mieczysław Wojtal Łukasz Hajnos Michał Waksmundzka-Hajnos Monika Kowalska Teresa 《平面色谱法杂志一现代薄层色谱法》2010,23(4):270-276
JPC – Journal of Planar Chromatography – Modern TLC - In a previous paper we discussed the possibility of fractionating the essential oils of different sage species by low-temperature... 相似文献
20.