Partitioning water content

El Extraction and subsequent Uquid/liquid partition Plant material and foodstuffs with a water content exceeding 70g/100g and a fat content below 2.5 g/100 g Fruit, vegetables, juices... 

Module E3 extraction and subsequent liquid/liquid partition for materials with a water content exceeding 70 g/lOOg, a fat content below 2.5 g/lOOg and a high acid content (highly recommended for determining acid-sensitive analytes)... 

This is another study that illustrates that the ensemble of water molecules can be partitioned into different classes. The state of a water molecule depends on whether it is directly interacting with a cation—and is a function of cation type—and on the total water content, which, when low, will not provide for enough molecules to form distinct crystallites. 

Gunning, Y.M.. Parker. R.. Ring. S.G.. Rigby. N.M.. Wegg, B., and Blake, A. Phase behavior and component partitioning in low water content amorphous carbohydrates and their potential impact on encapsulation of flavors, J. Agric. Food Chem., 48(2) 395-399, 2000. 

When amine-modified silica-gel columns are eluted with a mobile phase of acetonitrile-water, carbohydrates are separate on the basis of normal, phase partitioning - increasing the water content of the mobile phase... 

Contaminants may reach the subsurface in a gaseous phase, dissolved in water, as an immiscible hquid, or as suspended particles. Contaminant partitioning in the subsurface is controlled by the physicochemical properties and the porosity of the earth materials, the composition of the subsurface water, as well as the properties of the contaminants themselves. While the physicochemical and mineralogical characteristics of the subsurface sohd phase define the retention capacity of contaminants, the porosity and aggregation stams determine the potential volume of liquid and air that are accessible for contaminant redistribution among the subsurface phases. Enviromnental factors, such as temperature and water content in the subsurface prior to contamination, also affect the pollution pattern. 

The IL is mainly located in the upper phases of the ATPS. The lower phases contain the phosphate salt. Water is partitioning almost evenly between the two-liquid phases. By definition, all initial compositions belonging to the same tie-line split into two liquid phases of identical composition only the volume amounts (and the phase ratios) change. Since the tie-lines are, by chance, almost parallel to the water hypotenuse, the phase diagram clearly shows that the chemical composition of the two liquid phases crucially depends on the water content of the system. 

With respect to the nature of the particles, they found that the ETS particles were essentially fluid in nature and that they consisted primarily of organic material with a water content of about 15% (by weight). The authors postulate that the gas/particle partitioning of organic compounds in environmental tobacco smoke is governed primarily by absorption of the compounds into the condensed phase and not by adsorption at the surface. 

For this problem, assume an air-water partition constant, cH4aw = 30 and an organic carbon-water partition coefficient Kch oc = 10 L-kg-1oc. Also assume the air-plus-water-filled soil porosity is 0.4, the soil solid density is 2.5 g-mL"1, the soil water content is 12% by weight, and the organic carbon content is 5% by weight. Finally, assume the methane biodegradation obeys d[methane]totai/[Pg.774]

To be specific, permeability is the product of the partition coefficient K and diffusion coefficient D of a solute within a material. The partition coefficient is usually defined as the ratio of solute concentration in the material to the concentration in the solution it is a measure of the interaction between the polymer and the solute. The partition coefficient should decline as a gel shrinks and the average pore size declines, if other interactions between the solute and the gel are unchanged. The diffusion coefficient is also expected to decline as water content falls and obstruction to movement increases. While K is an equilibrium property, D is a transport property, and so these parameters can be evaluated independently. 

The activity of the silica is an important parameter. When silica is wet by several layers of water, pores are filled and solutes cannot undergo adsorption. As a consequence these are retained only slightly. They can even undergo partition mechanism. Figure 7 demonstrates the dramatic influence of water on retention. Reproducible retention can be achieved by Engelhardt s method (17) One tank is filled with dry solvent and another tank is filled with fully wet solvent. A proportioning valve allows for the exact mixing, and the water content is controlled. A moisture... 

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