The invention relates to strong hydrogen-bond acidic sorbents. The sorbents may be provided in a form that limits or eliminates intramolecular bonding of the hydrogen-bond acidic site between neighboring sorbent molecules, for example, by providing steric groups adjacent to the hydrogen-bond acidic site. The hydrogen bond site may be a phenolic structure based on a bisphenol architecture. The sorbents of the invention may be used in methods for trapping or detecting hazardous chemicals or explosives.

According to an example aspect of the present invention, there is provided a method of detecting carbon dioxide in a gaseous sample, the method comprising: flowing the gaseous sample through an anion exchange resin that is capable of selectively adsorbing CO.sub.2 present in the gaseous sample; releasing the adsorbed CO.sub.2 from the resin by heating the resin to a temperature in the range 80 to 250° C. to obtain a concentrated gaseous sample; determining the amount of an isotopic form of CO.sub.2 in the concentrated gaseous sample by infrared absorption spectroscopy.

An adsorbent comprising at least two types of covalently bound antigens having the ability to bind at least one component present in a blood flow or blood plasma flow passing through said adsorbent is disclosed, as well as a column containing said adsorbent, a kit containing said column in a sealed plastic bag, a method for the production of said kit, a method for reduction or elimination of undesired blood group specific antibodies or autoimmune antibodies in connection with autoimmune diseases, a method for treatment of myasthenia gravis, and a method for treatment of rheumatoid arthritis.

Provided is a packing material for liquid chromatography, including a gel obtained by polymerizing monomers including 40% by mass or more of a crosslinkable monomer having a (meth)acryloyloxy group.

The invention relates to strong hydrogen-bond acidic sorbents. The sorbents may be provided in a form that limits or eliminates intramolecular bonding of the hydrogen-bond acidic site between neighboring sorbent molecules, for example, by providing steric groups adjacent to the hydrogen-bond acidic site. The hydrogen bond site may be a phenolic structure based on a bisphenol architecture. The sorbents of the invention may be used in methods for trapping or detecting hazardous chemicals or explosives.

The present invention provides that powder is mainly constituted from secondary particles of hydroxyapatite. The secondary particles are obtained by drying a slurry containing primary particles of hydroxyapatite and aggregates thereof and granulating the primary particles and the aggregates. A bulk density of the powder is 0.65 g/mL or more and a specific surface area of the secondary particles is 70 m.sup.2/g or more. The powder of the present invention has high strength and is capable of exhibiting superior adsorption capability when it is used for an adsorbent an adsorption apparatus has.

[Problems] To provide a column-use adsorbent having an excellent balance of adsorption capacity and durability, and an adsorption apparatus.

[Means to solve problems] A column-use adsorbent made of powder of a porous particle group of hydroxyapatite or fluoroapatite formed by replacing at least part of a hydroxyl group of hydroxyapatite with fluorine atom, the porous particle group being a group of a plurality of porous particles having different particle sizes, the porous particle group meeting the condition of D.sub.Av×45/100≤D.sub.10≤D.sub.Av×75/100, in which D.sub.Av (μm) is an average particle size, and D.sub.10 (μm) is a particle size at which a cumulative volume of the porous particles from the small size side based on a particle size distribution is 10%.

The present invention provides that powder is mainly constituted from secondary particles of hydroxyapatite. The secondary particles are obtained by drying a slurry containing primary particles of hydroxyapatite and aggregates thereof and granulating the primary particles and the aggregates. A bulk density of the powder is 0.65 g/mL or more and a specific surface area of the secondary particles is 70 m.sup.2/g or more. The powder of the present invention has high strength and is capable of exhibiting superior adsorption capability when it is used for an adsorbent an adsorption apparatus has.

[Problems] To provide a method for treating hydroxyapatite filler so that it can be used multiple times in the separation of a charged material included in a sample liquid using adsorbent composed of the hydroxyapatite filler, a production method including the treatment method, and hydroxyapatite filler.

[Means to solve problems] The treatment method of the present invention comprises a first step of bringing a first liquid containing a predetermined material into contact with hydroxyapatite filler, and a second step of bringing a second liquid containing an alcohol into contact with the hydroxyapatite filler.

The invention relates to strong hydrogen-bond acidic sorbents. The sorbents may be provided in a form that limits or eliminates intramolecular bonding of the hydrogen-bond acidic site between neighboring sorbent molecules, for example, by providing steric groups adjacent to the hydrogen-bond acidic site. The hydrogen bond site may be a phenolic structure based on a bisphenol architecture. The sorbents of the invention may be used in methods for trapping or detecting hazardous chemicals or explosives.