Methods sorption

The development of highly seleetive sorbents for medieine, ehemistry, eeology, bioteehnology is impossible without usage of methods of analytieal ehemistry. Among various approaehes direeted on inerease of sensitivity of analytieal methods of traees elements determination, for example, in water solutions sorption methods play an important role. The nature of sorption eenters are of great importanee at synthesis of sorbents with multifunetional properties. 

Improved chemisorption methods ( self-assembled monolayers ) and physi-sorption methods (Langmuir-Blodgett films). 

Liquid Samples. Three procedures were evaluated for extracting pesticides from liquid samples collected at the Horticulture and Agronomy pits. They were the resin sorption method of Junk et al. (2), solvent extraction with hexane-diethylether, and solvent... 

Water Samples. The pesticide residues in ground water samples from sites adjacent to and remote from the disposal pit locations and the well water samples were analyzed by the resin sorption method using XAD-2 as described by Richard et al. (4) and Junk et al. ( 5) for measuring very low amounts of selected pesticides. 

The purpose of most experimental studies of diffusion is to obtain accurate diffusion coefficients as a function of temperature, pressure, and composition of the phase. For this purpose, the best approach is to design the experiments so that the diffusion problem has a simple anal3hical solution. After the experiments, the experimental results are compared with (or fit by) the anal3hical solution to obtain the diffusivity. The method of choice depends on the problems. The often used methods include diffusion-couple method, thin-source method, desorption or sorption method, and crystal dissolution method. 

Tracer diffusivities are often determined using the thin-source method. Self-diffusivities are often obtained from the diffusion couple and the sorption methods. Chemical diffusivities (including interdiffusivity, effective binary diffusivity, and multicomponent diffusivity matrix) may be obtained from the diffusion-couple, sorption, desorption, or crystal dissolution method. 

Nikolaev V, StreUco V, Korovin Yu et al (1982) Theoretical basis and practical use of enterosorp-tion method. In Sorption methods of detoxication and immunocorrection in medicine, Kharkiv, Ukraine (In Russian), pp 112-114... 

It is known that any sorption method nsed for blood pnrification increases the quantity of pathological forms of erythrocytes. Endovascular laser blood irradiation (ELBI) is the most effective method of preserving and restoring erythrocytes however, apphcation of ELBI in the clinic is largely based on empirical evidence. The influence of ELBI on the main blood vessel s walls through which the irradiation is performed has not been clarified. 

The rapid benzene sorption method used in this work was developed by H. A. Benesi. The expert technical assistance of J. van Amstel, P. R. Chong, J. M. Nanne, and S. K. Southard is gratefully acknowledged. 

Characterisation of Microporous Materials by Dynamic Sorption Methods... 

Dynamic sorption methods are giving fast and accurate results in the characterisation of a variety of different materials. Moreover the combined elution/thermodesorption IGC method permits a separation between micropore on one hand and mesopore and outer surface area on the other hand. The obtained results give a much more realistic picture of adsorption properties of highly micropores materials. 

RECOVERY OF VALUABLE MINERAL COMPONENTS FROM SEAWATER BY ION-EXCHANGE AND SORPTION METHODS... 

Table 10.2 presents the kinetic information for the main reactions, in which the frequency factors have been calculated from turnover-frequency (TOF) data [8, 9]. This term, borrowed from enzymatic catalysis, quantifies the specific activity of a catalytic center. By definition, TOF gives the number of molecular reactions or catalytic cycles occurring at a center per unit of time. For a heterogeneous catalyst the number of active centers can be found by means of sorption methods. Let us consider that the active sites are due to a metal atom. By definition [15] we have ... 

The measurement of sorption, diffusion and permeability coefficients takes place as a rule using one of three methods sorption of the gases in the polymer, permeation through a membrane (film or sheet) into a sealed container or permeation through a membrane into a gas stream. As far as possible sorption methods should be used together with permeation methods that are specific for the measured gas/polymer system in order to uncover any possible anomalies or errors in the measurements by comparison of results. 

This method for measuring the change in sorption over time cannot be used to measure polymers that absorb permeants very quickly like LDPE, since it produces large errors. In any case the sorption method is suitable for determining of the equilibrium concentration ce of permeant in the polymer and consequently for the measurement of K. 

One of the central problems in the study of diffusion is to evaluate D for a given system as a function of such parameters as penetrant concentration and temperature. For polymer-penetrant systems with which we are concerned in this article two experimental methods are typical for this purpose. They are the sorption method and the permeation method. 

Unless otherwise stated, the enzyme binding capacity of membraneous collagen was measured by the equilibrium sorption method. 

In Table 1 manufacturers of carrier gas and volumetric adsorption measuring instruments are compiled. Most of these companies offer also mercury porosimeter and gas pycnometer. Mercury porosimetry extends the measuring range of the sorption method towards larger pores. Table 2 gives a survey on the commercial offer of gravimetric apparatus. 

Ion-Exchange and Sorption Methods for Recovering Magnesium from Seawater... 

Traditional methods for producing magnesium by processing hydromineral sources fail to satisfy the newer ecological standards. Consequently, new, alternative technologies, based on sorption methods are being considered despite the profitability of earlier methods. 

Ion-Exchange Methods of Potassium Recovery from Seawater The results of studies carried out during the past 10-15 years in Japan, the United States of America, and Russia have shown that sorption methods for potassium recovery from the sea will be the most attractive in the... 

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