Toyo Soda Manufacturing Co., Ltd.

Tetsuo Ikushige

Susumu Matsushita

Nobuyuki Baba

Yoshimitsu Tada

Keiichi Housako

Tomokazu Tabata

Jun-ichi Toei

In chromatographic analysis by the steps of adding a sample solution to a flow of an eluant, passing the eluant flow through a separation column thereby converting the eluant flow into an eluate flow containing component ions of the eluant flow in separate zones, passing the eluate flow through an ion-exchange membrane tube thereby allowing the eluate to come into contact with an aqueous solution of an H.sup.+ form or OH.sup.- form electrolyte outside the tube through the wall of the membrane tube, substituting those of the component ions contained in the eluate flow which have the same type of electric charge as H.sup.+ or OH.sup.- with said H.sup.+ or OH.sup.- thereby giving rise to a deionized solution flow, and passing the deionized solution flow through a detection cell thereby causing the component ions which have survived the substitution to be detected as separated into distinct zones, improvements are obtained by causing the aqueous solutions of H.sup.+ or OH.sup.- form electrolyte to be contacted with an insoluble ion exchanger of the same H.sup.+ or OH.sup.- type as said electrolyte to the aqueous solution. Use of a high molecular weight electrolyte having a molecular weight of 500 or more permits detecting anion or cation present in a very low concentration with ample sensitivity and high reproducibility without provision of forwarding means.

Apparatus for chromatographic analysis

In chromatographic analysis by the steps of adding a sample solution to a flow of an eluant, passing the eluant flow through a separation column thereby converting the eluant flow into an eluate flow containing component ions of the eluant flow in separate zones, passing the eluate flow through an ion-exchange membrane tube thereby allowing the eluate to come into contact with an aqueous solution of an H.sup.+ form or OH.sup.- form electrolyte outside the tube through the wall of the membrane tube, substituting those of the component ions contained in the eluate flow which have the same type of electric charge as H.sup.+ or OH.sup.- with said H.sup.+ or OH.sup.- thereby giving rise to a deionized solution flow, and passing the deionized solution flow through a detection cell thereby causing the component ions which have survived the substitution to be detected as separated into distinct zones, improvements are obtained by causing the aqueous solution of H.sup.+ or OH.sup.- form electrolyte to be contacted with an insoluble ion exchanger of the same H.sup.+ or OH.sup.- type as said electrolyte to the aqueous solution. Use of a high molecular weight electrolyte having a molecular weight of 500 or more permits detecting anion or cation present in a very low concentration with ample sensitivity and high reproducibility without provision of forwarding means.

Method for chromatographic analysis

Liquid injection device

The present invention relates to a chromatographic apparatus for analyzing a sample of an aqueous solution containing a plurality of micro-concentration components. In the apparatus an aqueous solution sample and an eluting solution are introduced into a separating column having a length of 20 to 90 mm, which is filled with a predetermined separating carrier and placed in a thermostatic oven which also contains a detecting cell connected to the separating column, by means of a constant flow, pulse free feeding pump.

Chromatographic apparatus

A high speed liquid chromatography to separate hydrocarbon compounds contained in a solution into three components, namely, saturates, unsaturates and aromatics, an analytical method of hydrocarbons which comprises

Analytical method of hydrocarbon compounds

Peptides are separated by passing a solution of peptides and an eluent through a column containing a crosslinked hard type starch gel whereby peptides and/or other components are non-fractionally or fractionally separated.

Method of separating peptides

Glycosides such as stevioside, glycyrrhizin and neohesperidin dihydrochalcone are separated from non-glycosides such as phyllodulcin and perillartine by column chromatography using a porous gel.

Separation of sweet component from natural sweet extracts

Uranium values are obtained from phosphate rock by acidifying phosphate rock containing uranium values and at least one other heavy metal with a mineral acid so as to obtain a crude acid, solvent extracting the crude acid with an organic solvent so as to separate a raffinate from a relatively pure, wet process phosphoric acid and treating said raffinate with a base so as to raise the pH to 1-2 whereby uranium hydroxide or phosphate and other heavy metal hydroxides or phosphates are coprecipitated. The uranium content of the coprecipitate after drying is at least as high as 0.3% which is comparable to that of uranium ores of the highest quality.

Growing community of inventors

Yamaguchi, Japan

Tetsuo Ikushige