ion exchange


  • WordNet 3.6
    • n ion exchange a process in which ions are exchanged between a solution and an insoluble (usually resinous) solid; widely used in industrial processing
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In news:

A global supplier of ion exchange resins, has received ISO 9001:2000 certification for its manufacturing plant in Philadelphia, as well as its corporate offices in Bala Cynwyd, PA.
Beleaguered lithium-ion battery manufacturer A123 Systems Inc has been dealt yet another blow — it was notified Tuesday by Nasdaq that its stock price is too low and could be delisted from the exchange's index.
Typical cation exchange water softeners have been under regulatory attack because of the salt used to regenerate the ion exchange bed and the water, which is sent to waste during the regeneration process.
Ion exchange resins used in softening, anion or deionization applications are designed to remove certain ionized substances from water.
It is therefore important to ensure that a sufficient buffer concentration is used and that the IEX column is fully equilibrated to ensure that any buffer- ion exchange is complete prior to loading valuable product onto the column.
Ion Exchange Resins and Processes for Industrial Water Treatment.
Nitrate Removal by Ion Exchange .
Envirogen Technologies Inc announced the successful startup of an ion exchange system for the East Valley Water District (EVWD) of San Bernardino County, Calif, to remove uranium and nitrates from groundwater at the District's #40 well site.
Purolite's softening calculator is a simple-to-use tool requiring the minimum of inputs to estimate ion exchange resin requirements to soften water, and can be found on
The ion exchangers cannot tell water made with tritium from any other water, nor can they remove it.
Novel Strategy Combines Albumin and IgG Removal with Ion-Exchange Fractionation.
Today's power plants are more frequently choosing off-site regeneration for the ion exchange resins used in boiler feedwater makeup applications.
Specialty chemicals company LANXESS is to increase its prices for Lewatit and Ionac ion exchange resins by up to 10 percent globally.
Indeed, ultrapure water is the basis for innumerable analytical applications like atomic absorption, ion exchange chromatography and inductively coupled plasma mass spectrometry (ICP-MS).
The resin's chemical structure avoids the "nitrate dumping" that can occur when traditional ion exchange resins are used to treat nitrate-bearing drinking water.

In science:

Inside the solid, the potential V eff seen by an electron becomes attractive, due to the electrostatic potential of the ion cores, due to the electrostatic field of the surface-dipole layer, and due to the lowering of the electron energy by the formation of an exchange-correlation hole.
Theory of Adsorption on Metal Substrates
In this case, the interplay between strongly nonlinear interwell charge transport and the large tunable spin splitting induced by exchange interactions with spin-polarized Mn ions produces interesting spin features.
Photon-assisted transport in semiconductor nanostructures
We found that percentage of the charge exchange rate in the net ionization rate of these ions in the solar neighbourhood depends only weakly on the heliocentric distance.
Are the sungrazing comets the inner source of pickup ions and energetic neutral atoms?
The exponential t slope parameter b ≈ 11.5 GeV−2 obtained in d+Au collisions where the deuteron dissociates is similar to values measured in scattering off the proton at HERA. A theoretical study of the role of multiphoton exchange in lepton pair production in heavy-ion collisions has been presented by Kuraev .
Summary of Working Group B: Diffraction and Vector Mesons
Here we report a success in obtaining a clean theoretical formula directly relating dynamical correlation, as characterized by the exchange-correlation (xc) kernel of time-dependent density-functional theory (TDDFT), with the experimentally observed stopping power (SP) of solids for slow ions.
Time-Dependent Density-Functional Theory for the Stopping Power of an Interacting Electron Gas for Slow Ions