Abstract: A plurality of samples in a moist medium are treated simultaneously in a microwave cavity. The samples are conducted into the cavity through apertures formed in an upper wall of the cavity. Each aperture is surrounded by a chimney configured to create a barrier opposing the propagation of microwaves from the cavity. The samples are introduced into receptacles which extend through the chimneys. Each receptacle can be supported on the chimney a lower end of the receptacle disposed within the cavity. Alternatively, the receptacles can be in the form of continuous tubes extending through upper and lower walls of the cavity in order to convey continuous flows of the sample.

Abstract: A dissolution cell for determining the kinetics of dissolution of a solid substance in a particular liquid, includes (a) a housing receptacle having a closed bottom end and an open top end, an interior of such receptacle defining (i) a lowermost upwardly diverging conical zone provided with liquid inlet means extending from a tip of the conical zone through the bottom end of the receptacle, (ii) a first essentially cylindrical zone surmounting the conical zone and (iii) a second essentially cylindrical zone surmounting the first essentially cylindrical zone, having a cross-sectional diameter greater than that of the first essentially cylindrical zone and being in communicating relationship therewith, such conical zone (i) and such first essentially cylindrical zone (ii) defining a chamber for the dissolution of a solid substance in a liquid solvent, (b) a closure leak-proofedly secured to the open end of the receptacle and provided with a solute outlet means, and (c) filtration means secured between such clos

Abstract: For a fluid chromatography apparatus including a precolumn and an analytical column, a device is provided with means for operably connecting said precolumn and column, said connecting means comprising a body member provided with support surfaces for a column inlet and a precolumn outlet, and said body member including a plurality of passages adapted to independently functionally interconnect said precolumn outlet and said column inlet with each other, and individually independently with fluid inlet and/or outlet means, either internally or externally.

Abstract: An improved device/apparatus for sweeping and injecting a sample and at least one standard into the separation column of a fluid-phase chromatograph, including (i) means for securing same to the inlet of such separation column, (ii) a supply inlet for a stream of carrier medium and means for directing said stream to said separation column, (iii) dividing means in said device for dividing said stream into primary and secondary streams, (iv) distributing means for directing said primary stream to said separation column and distributing said primary stream over the inlet area of said column, (v) means for directing said secondary stream axially into said separation column inlet, and (vi) means for introducing a sample into said secondary stream, the improvement which comprises (vii) means for introducing at least one standard also into said secondary stream.

Abstract: In this device, for sweeping and injecting samples into the separation column of a chromatography apparatus, the separation column is secured to an opening connecting with a conduit which feeds a stream of carrier liquid to the device. The device subdivides a stream of carrier liquid into a primary stream and a secondary stream and feeds the primary stream over the entire cross section of the entrance to a separation column. Simultaneously feed of the secondary stream axially to the entrance of the separation column is performed while introducing the sample into the secondary stream. The device is usable particularly in liquid-phase chromatography.

Abstract: A safety device for distributing the carrier liquid of a chromatography apparatus having a carrier liquid source, a carrier liquid reservoir provided with an entrance and an outlet, an overflow conduit, a conduit for conveying the carrier liquid toward the chromatography apparatus, and three interdependently controlled valves respectively located between the exit of the reservoir and the overflow conduit, between the entrance of the reservoir and the carrier liquid source, and between the carrier gas source and the reservoir exit. The device is usable for distributing the carrier liquid of a liquid-phase chromatography apparatus wherein the carrier liquid is pushed by a carrier gas.

Abstract: A separation column is removably affixed within a column chromatography apparatus by means of a column engaging member, e.g., a concentric tube, and by securing a dispensing head of the apparatus to such member and engaged column via substantially axial compressive strength applied through said column engaging member.