JPH1073580A - Ion exchange column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform ion exchange having the adequate amount of solvent without preliminary experiment by supporting the ion exchange part of the ion exchange column having the ion exchange part on the inner wall surface of a capillary tube with a holding part, wherein the ion exchange group of the inner wall surface comprises a semiconductor. SOLUTION: An ion exchange part 12a, which is applied on the inner surface of a tube 11, is constituted of a holding part 14 comprising a semiconductor layer and an ion exchange group 16 held by the holding part 14. As the material of the semiconductor used in the holding part 14, e.g. a polyacetyl group is used. For the ion exchange group 16, which is applied on the surface of the holding part 14, a sulfone group or the like is used. An electric circuit 15 measures the electric conductivity between two points, which are provided on the holding part 14 separated by a specified distance. For the connection of the electric circuit 15 and the ion exchange part 12a, a part of the ion exchange group 16 in the vicinities of both ends of the ion exchange part 12 is peeled and removed beforehand, and the terminal of the electric circuit 15 is connected to the holding part 14 of the semiconductor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an ion exchange column.

[0002]

2. Description of the Related Art An ion exchange column is used for extracting ions from a specific liquid to be measured and performing ion analysis. FIG. 1 shows the configuration of a conventional ion exchange column.

[0003] Reference numeral 1 denotes an ion exchange column in which a tube is filled with an ion exchange resin, 1a denotes an inlet of the ion exchange column 1, and 1b denotes an outlet of the ion exchange column. Each of the ion-exchange resins 2 packed in the ion-exchange column 1 has an ion-exchange portion 2a formed on the surface of a carrier 2b made of diatomaceous earth or the like as seen in the enlarged sectional view shown in FIG. Consist of things. As the ion exchange part 2a, a substance having an amino group and a sulfonic acid group on the surface is generally used.
Adsorb anions and cations respectively. In order to increase the chance of contact between the sample passing through the ion exchange column 1 and the ion exchange section 2a, the ion exchange section 2a is
Formed on the surface. Reference numerals 3a and 3b denote beakers serving as saucers for collecting liquid.

An analyst pours a sample through the inlet 1a. The target ions in the sample are captured by the ion exchange part 2a in the ion exchange resin 2 selected in advance (for example, an amino group is selected for an anion and a sulfone group is selected for a cation). Together with the solvent of the sample accumulates in the beaker 3a fixed below the outlet 1b.

[0005] Next, the target ions are transferred to the ion exchange section 2a.
To separate ions from the inlet 1a
Pour more. A solvent containing a target ion can be obtained in a newly prepared beaker 3b.

[0006]

SUMMARY OF THE INVENTION In the prior art,
Whether the ions have been sufficiently separated from the ion exchange groups
It is determined by the amount of the solvent flowing at the time of ion separation. When the amount of the flowing solvent is small, ions remain in the ion exchange group, and when the amount of the flowing solvent is large, it is uneconomical, and the concentration of the target ion in the beaker 3b becomes low, which hinders the subsequent analysis. Becomes Therefore, the solvent is, for example, 10 ml, 20
The amount of ions in the beaker 3b was analyzed at that time by flowing 40 ml and 40 ml, and as shown in FIG. 2, a graph was prepared in which the horizontal axis represents the amount of flowing solvent and the vertical axis represents the amount of ions existing in the solvent. Preliminary experiments were needed to determine the amount of solvent that could sufficiently separate the ions from the ion exchange section 2a. Therefore, it was troublesome and required a solvent for preliminary experiments. An object of the present invention is to provide an ion exchange column that does not require a preliminary experiment.

[0007]

An ion exchange column according to the present invention, which has been made to solve the above problem, is an ion exchange column having an ion exchange portion on the inner wall surface of a capillary tube, wherein the ion exchange portion is provided on the inner wall surface. Characterized in that the ion-exchange groups are held by a holding portion made of a semiconductor.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In an ion exchange column according to the present invention, a holding portion for holding an ion exchange group comprises a semiconductor layer. Since the electric conductivity of this semiconductor layer when ions are trapped by the ion exchange group is different from the electric conductivity of the semiconductor layer of the holding portion when ions are not trapped, this electric conductivity must be measured. Thereby, it can be determined whether or not ions are captured by the ion exchange groups.

Hereinafter, the present invention will be described with reference to examples.
FIG. 3 shows the configuration of an ion exchange column according to one embodiment of the present invention. 10 is an ion exchange column according to the present invention,
Reference numeral 11 denotes a tube formed of glass, 12a denotes an ion exchange section applied to the inner wall of the tube 11, 10a denotes an inlet of the ion exchange column 10, 10b denotes an outlet of the ion exchange column 10, and 13a and 13b denote beakers serving as trays. is there. The ion exchange section 12a applied to the inner surface of the tube 11 includes a holding section 14 made of a semiconductor layer and an ion exchange group 16 held by the holding section. As a semiconductor material used for the holding portion 14, for example, a polyacetyl group is used as shown in an enlarged portion of FIG. As the ion exchange group 16 applied to the surface of the holding section 14, a sulfone group or the like is used as in the conventional example.

Reference numeral 15 denotes an electric circuit for measuring the electric conductivity of the holding section 14, which is provided at a predetermined distance from the holding section 14 and for measuring the electric conductivity between two points. . Specifically, a power supply and a resistor are connected in series, and by measuring the voltage across the resistor, the electrical conductivity can be obtained from the measured voltage. The connection between the electric circuit 15 and the ion exchange unit 12a is such that some of the ion exchange groups 16 near both ends of the ion exchange unit 12a are peeled off in advance and the terminals of the electric circuit are connected to the semiconductor holding unit 14. . A metal electrode electrically connected to the holding unit 14 may be formed on the glass surface of the tube 11 of the ion exchange column 10, and an electric circuit may be connected to the metal electrode.

The analyst measures the electric resistance (reciprocal of the electric conductivity) of the holding unit 14 by the electric circuit 15 in advance.
The value at that time is defined as X1Ω. Next, the sample is poured from the inlet 10a. The target ions in the sample are captured by the ion-exchange groups 16 selected in advance, and the other components collect together with the solvent of the sample in the beaker 13a fixed below the outlet 10b. At that time, the bond between the ion exchange group and the target ion in the sample affects the conduction band electrons of the holding unit 14, and as a result, the electrical conductivity of the holding unit 14 changes. The electric resistance value at this time is assumed to be X2 Ω. Next, in order to separate the target ion from the ion exchange group 16, a solvent for stripping the ion is poured from the inlet 10a, and a solvent containing the target ion is obtained in a newly prepared beaker 13b. At this time, the solvent is poured while continuously measuring the electric resistance value X3 Ω of the holding unit 14 detected by the electric circuit 15, and when X3 becomes sufficiently close to X1 Ω with respect to X2, the objective is achieved. Since it can be considered that most of the ions have been separated from the ion exchange part, the injection of the solvent is terminated. The embodiments of the present invention are summarized below. An ion exchange column having an ion exchange section on an inner wall surface of a capillary tube, wherein the ion exchange section has an ion exchange group on the inner wall surface held by a holding section made of a semiconductor, and electrodes are formed at two separated points of the holding section. An ion-exchange column, characterized in that it is made.

[0012]

As described above, in the ion-exchange column of the present invention, as described above, the analyst measures the electric resistance (electrical conductivity) of the ion-exchange group holding section to continuously change the ion exfoliated state. Injection of the solvent can be performed while the measurement is being performed in a short time, so that ion exchange with an optimum amount of the solvent can be performed without performing a preliminary experiment.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a conventional ion exchange column.

FIG. 2 is a diagram showing a graph of a conventional preliminary experiment.

FIG. 3 is a configuration diagram of an ion exchange column according to an embodiment of the present invention.

[Explanation of symbols]

 10: Ion exchange column 11: Tube 12a: Ion exchange unit 13a: Beaker 13b: Beaker 14: Holding unit (semiconductor) 15: Electric circuit (for measuring electric conductivity) 16: Ion exchange group

Claims (1)

[Claims] 1. An ion exchange column having an ion exchange portion on the inner wall surface of a capillary tube, wherein the ion exchange portion has an ion exchange group on the inner wall surface held by a holding portion made of a semiconductor. column.