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1.
Densities of four aqueous NaNO3 solutions (0.100, 0.303, 0.580, 0.892 mol-kg–1 H2O) have been measured in the liquid phase with a constant-volume piezometer immersed in a precision liquid thermostat. Measurements were made at ten isotherms between 292 and 573 K. The range of pressure was 0.1–30 MPa. The total uncertainty of density, pressure, temperature, and concentration measurements were estimated to be less than 0.06%, 0.05%, 10 mK, and 0.014%, respectively. Values of saturated densities were determined by extrapolating experimental P- data to the vapor pressure at fixed temperature and composition. Apparent molar volumes were derived using measured values of density for the solutions and for pure water. The apparent molar volumes were extrapolated to zero concentration to yield partial molar volumes at infinite dilution. The temperature, pressure, and concentration dependence of partial and apparent molar volumes were studied. The measured values of density and apparent and partial molar volume were compared with data reported in the literature. 相似文献
2.
R. A. Alieva S. Z. Gamidov F. M. Chyragov A. A Azizov 《Journal of Analytical Chemistry》2005,60(12):1114-1117
A method is developed for cadmium and zinc preconcentration on a minicolumn packed with a new chelating polymer sorbent. The effects of the test solution pH and volume, the sample matrix composition, the eluent volume, and the sample and eluent flow rates are studied. Zinc and cadmium in the eluate are determined by flame atomic absorption spectrometry. Under optimal conditions, the determined ion recovery is more than 95%. The detection limits (3σ, n = 20) are found to be 15.0 (Cd) and 17.2 (Zn) ng/mL. The developed method is employed for cadmium and zinc determination in samples of seawater and water obtained after oil pumping. 相似文献
3.
Yu.A. Ustynyuk P.I. Zakharov A.A. Azizov V.K. Potapov I.M. Pribytkova 《Journal of organometallic chemistry》1975,88(1):37-64
Dissociative ionisation of organometallic cyclopentadiene derivatives containing one, two or three M(CH3)3 groups (M Si, Ge, Sn) has been studied.Among the monometallated compounds, C5H5Si(CH3)2Cl, C5H5Si(CH3)2OCH3 and (C5H5)4Sb have also been investigated. To verify fragmentation patterns, the spectra of deuterated compounds such as C5D5Si(CH3)3, C5D5Sn(CH3)3, C5D4Si2(CH3)6 and C5D3Si3)9 have been measured. Dissociative ionisation of h1-cyclopentadienyl derivatives has been shown to differ essentially from that of h5-compounds. 相似文献
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Khazangul A. Ibrahimova Abdulsaid A. Azizov Ofeliya O. Balayeva Rasim M. Alosmanov Sevinj C. Mammadyarova 《Mendeleev Communications》2021,31(1):100-103
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For plus-operators in a Banach indefinite space, we consider a linear-fractional relation. The classes of operators with the
empty domain of definition for such a relation are described. The sufficient (and necessary, in some meaning) conditions for
the chain rule to be valid are given. 相似文献
8.
Optics and Spectroscopy - Spectral methods for determining the content of chlorophyll in vegetation subjected to anthropogenic action are considered. The regularities in the changes in the spectral... 相似文献
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We study self-adjoint operators in Krein space. Our goal is to show that there is a relationship between the following classes of operators: operators with a compact “corner,” definitizable operators, operators of classes (H) and K(H), and operators of class D κ +. 相似文献