A hybrid trap including a replaceable open-tubular capillary trap followed by a packed trap is used to collect, preconcentrate, and recover a sample, such as VOCs and SVOCs found in air. The capillary stage prevents losses and carryover of the heavy fraction and can also collect the particles in air that contain the heavier SVOCs, also preventing them from reaching the packed stage. The packed stage traps lighter organic compounds that are not as prone to carryover due to channeling. The capillary and packed traps together provide quantitative recovery of compounds boiling from as low as 50 C. to as high as 600 C. The sample can be directly desorbed onto the GC column, which avoids losses and contamination caused by other approaches that thermally desorb samples through transfer lines and rotary valves more remote to the GC oven.

A housing is provided with an internal space for accommodating an insert and a cylindrical cap attachment part provided, at the distal end surface thereof, with an opening part communicating with the internal space. An inclined groove that is inclined from the distal end side to the proximal end side of the cap attachment part along the circumferential direction of the cap attachment part is provided on the outer circumferential surface of the cap attachment part. A cap fixing part for attaching a seal cap to the cap attachment part has a cap holding part for holding the outer peripheral surface of the seal cap and an elastic part connected to the cap holding part. The elastic part is provided with a protrusion that is fit into the inclined groove of the outer peripheral surface of the cap attachment part.

A gas chromatograph includes a sample introduction portion and a heater block. A contact portion is fit into a first recess of a main body of the sample introduction portion. The heater block is fixed to and positioned with respect to the main body of the sample introduction portion by directly coming into contact with the contact portion provided on the main body of the sample introduction portion. For this reason, the heater block may be surely positioned with respect to the sample introduction portion. In addition, the heater block may be positioned without providing a member such that heat from the heater block is transferred to the outside and lost, and thus the sample introduction portion may be efficiently heated.

The present application relates to a method for detecting the content of a glycosaminoglycan carboxylated derivative in a sample, and an application thereof. The method comprises: (1) hydrolyzing a sample to obtain a hydrolysate containing a compound as represented by formula (I); (2) testing the hydrolysate by means of liquid chromatography-tandem mass spectrometry; and (3) by using a glycosaminoglycan carboxylated derivative as a standard substance, hydrolyzing solutions thereof having different gradient concentrations according to the method in step (1), detecting, according to the method in step (2), mass spectrum signal peak areas of the compound as represented by formula (I) in the hydrolysates of the standard substance solutions having different concentrations, forming a standard curve on the basis of the mass spectrum signal peak areas against the amounts of the glycosaminoglycan carboxylated derivative standard substance, and according to the standard curve, calculating the content of the glycosaminoglycan carboxylated derivative in the sample according to the mass spectrum peak areas of the compound as represented by formula (I) determined in step (2). According to the method in the present application, hydrolysis products of a specific structure can be stably obtained by hydrolysis of the glycosaminoglycan carboxylated derivative, the structure can be detected by means of MS, and a hydrolysis product having higher mass spectrum abundance is selected, so that the amount of the glycosaminoglycan carboxylated derivative can be indirectly calculated. Moreover, the detection method has strong specificity, high accuracy, good precision, low limit of quantitation, and low limit of detection.

A water removal method for gas concentration sampling, and a sampling method and device. The water removal method comprises: removing water from a sample gas by means of a first cold trap tube filled with a hydrophilic material, and then concentrating the sample gas by means of a concentration cold trap tube; then by means of a carrier gas, conveying components desorbed by the first cold trap tube under a heating state to a second cold trap tube that is in a cooled state and that is filled with a hydrophobic organic adsorbent material, and adsorbing organic substances in the components desorbed by the first cold trap tube: by means of the carrier gas, bringing the moisture desorbed by the first cold trap tube out of the second cold trap tube, and then by means of the carrier gas, conveying residual components desorbed by the first cold trap tube and the second cold trap tube under the heating state to the concentration cold trap tube for concentration.

When mounting a second assembly 36 to a first assembly 35 that is fixed to a main body, the second assembly 36 engages a second connection element 54 of a non-rotation unit 361 of the second assembly 36 with a first connection element 354 of the first assembly 35. A rotating part 362 is mounted on the first assembly 35 when the rotation unit 362 is rotated. Therefore, an operator can carry out positioning for the second assembly 36 by connecting the second connection element 54 of the second assembly 36 with the first connection element 354 of the first assembly 35. The second assembly 36 can be smoothly mounted on the first assembly 35 that is fixed to the main body. The second connection element 54 of the non-rotation unit 361 connects with the first connection element 354 of the first assembly 35, so that the non-rotation unit 361 is prevented from rotating together with the rotation unit 362 during use and the assemblies that contact the non-rotation unit 361 are protected from damage.

A method for detecting a residual crosslinking aid in a crosslinked resin molded body includes a subject heating step in which a crosslinked resin molded body is heated at a temperature of 500 C. or higher and 700 C. or lower for a time of 3 seconds or more and 30 seconds or less, a subject analysis step in which gas chromatographic analysis is performed on a gas generated in the subject heating step, and a detection step in which an unreacted crosslinking aid is detected on the basis of a peak originating from a residual crosslinking aid in a chromatogram obtained in the subject analysis step.

A device for biological sample preparation and analysis is disclosed. The device includes a substrate and a plurality of spaced apart arrays disposed on an upper surface of the substrate. Each array includes a plurality of reaction vessels, each reaction vessel having a hydrophilic surface. A hydrophilic ring surrounds each array. Methods of making and using the device are also disclosed.

A thermostat arrangement for a sample separation device for separating a fluidic sample includes a separation unit thermostat unit for adjusting a temperature of a separation unit for separating the fluidic sample in a mobile phase, a sample handling unit thermostat unit for adjusting the temperature of a sample handling unit for handling the fluidic sample, and a thermal coupling unit for thermally coupling the separation unit thermostat unit with the sample handling unit thermostat unit.

An apparatus for detecting a presence of at least one analyte in a gas sample. The apparatus comprises a pump for drawing a gas sample from an ambient air, a passage having first and second ends, a chamber connected to the first end and containing a concentrating element for collecting at least one analyte from the gas sample, a chromatographic separator connected to a second end of the passage, and a gas source for streaming a carrier gas via the chamber to transfer the at least one analyte toward at least one chemical detector, via the chromatographic separator, in a first direction. The pump draws the gas sample via the chamber in a second direction and the first and second directions are substantially opposing to one another.