Ion suppressor and ion chromatograph
AssigneeShimadzu Corporation
InventorKatsumasa Sakamoto
Life of this patent
Estimating the term…
Abstract
An ion suppressor includes ion exchange membranes between a pair of electrodes. Regeneration liquid channels are provided in the spaces between the electrodes and the ion exchange membranes, and an eluent channel is provided between the ion exchange membranes. Ion re-exchange in the eluent on the downstream side of the eluent channel is suppressed, thereby making it possible to improve the detection sensitivity for the ion to be measured. For example, the eluent channel has a folded structure, thereby increasing the amount of current on the downstream side of the eluent channel, and thus, the accumulation of ions is suppressed, and accordingly, ion re-exchange in the eluent can be suppressed.
Claims13
An ion suppressor that exchanges ions in an eluent from a separation column of an ion chromatograph, the ion suppressor comprising:
- a first ion exchange membrane and a second ion exchange membrane are disposed between a pair of electrodes of a first electrode and a second electrode,
- an eluent channel for allowing passage of the eluent from the separation column of the ion chromatograph is provided in a space between the first ion exchange membrane and the second ion exchange membrane,
- a first regeneration liquid channel for allowing passage of a regeneration liquid that regenerates the first ion exchange membrane is provided in a space between the first electrode and the first ion exchange membrane,
- a second regeneration liquid channel for allowing passage of a regeneration liquid that regenerates the second ion exchange membrane is provided in a space between the second electrode and the second ion exchange membrane, and
- the eluent channel has a folded structure, where an introduction part for introducing the eluent from the separation column into the eluent channel and a discharge part for discharging the eluent from the eluent channel are disposed close to each other;
- wherein the folded structure comprises a third ion exchange membrane provided between the first ion exchange membrane and the second ion exchange membrane, and
- the eluent channel comprises a first eluent channel between the first ion exchange membrane and the third ion exchange membrane, and a second eluent channel between the second ion exchange membrane and the third ion exchange membrane.
An ion suppressor that exchanges ions in an eluent from a separation column of an ion chromatograph,
- wherein a first ion exchange membrane and a second ion exchange membrane are disposed between a pair of electrodes of a first electrode and a second electrode,
- a first regeneration liquid channel for allowing passage of a regeneration liquid that regenerates the first ion exchange membrane is provided in a space between the first electrode and the first ion exchange membrane,
- a second regeneration liquid channel for allowing passage of a regeneration liquid that regenerates the second ion exchange membrane is provided in a space between the second electrode and the second ion exchange membrane,
- an eluent channel support with an opening is disposed between the first ion exchange membrane and the second ion exchange membrane,
- a mesh material that allows passage of a liquid is provided in the opening provided in the eluent channel support, and the opening constitutes an eluent channel for allowing passage of the eluent from the separation column of the ion chromatograph,
- the eluent channel is provided with a discharge part for discharging the eluent from the eluent channel, at one end in an eluent movement direction, and
- a shielding membrane for preventing contact between a mesh material provided on and near the discharge part and the first ion exchange membrane and the second ion exchange membrane is provided each between the eluent channel support and the first ion exchange membrane and between the eluent channel support and the second ion exchange membrane.
Dependencies are inferred from the claim text.