A vial cap for removing a matrix component from a liquid sample is described. The vial cap includes a cap body, an inlet portion, and an outlet portion. The cap body is configured to have a slidable gas and liquid seal with a side wall of a sample vial. The inlet portion includes a counterbore section that holds a filter plug. The filter plug includes a polyethylene resin and a material selected from the group consisting of an ion exchange material and a reversed-phase material. The vial cap is adapted for solid phase extraction for use in an autosampler with a plurality of sample vials.

Embodiments disclosed herein are directed to gaseous mercury detection systems, calibration systems, and related methods. The gaseous mercury detection systems are configured to detect gas-phase mercury-compounds present in ambient air. For example, the gaseous mercury detection systems collect gas-phase mercury-compounds from ambient air and release the gas-phase mercury-compounds at concentrations capable of being measured by a gas-chromatography mass spectrometer without heating the gas-phase mercury-compounds above a decomposition temperature of at least one gaseous mercury compound that may present in the mercury-containing gas. The calibration systems are configured to determine an accuracy of or calibrate a gaseous mercury detection system. The disclosed calibration systems may be integrated with or distinct from the gaseous mercury detection systems disclosed herein.

An adapter housing is described that can be used for high performance liquid chromatography, which can be releasably connected to a socket unit. The adapter housing includes a bore which passes through the adapter housing and a pre-column which can be arranged in the bore to protect the separation column from contaminants and/or to concentrate the fluid to be analyzed. A sealing element seals the adapter housing in relation to the socket unit at the end-face wall of a pilot bore.

The present invention discloses a method for initiating a graphene oxide (GO) through reduction by a reductant to controllably release organic compounds, comprising the following steps: (1) mixing GO and a buffer solution; (2) further mixing with a sewage containing organic contaminants; (3) conducting solid-liquid separation, mixing the solid phase and the pure, introducing and N.sub.2; (4) further adding the reductant; (5) conducting sequential batch kinetics experiment. The present invention utilizes the size effect and polarity control of GO to selectively adsorb aromatic organic contaminants in sewage and fully transfer the selectively adsorbed organic contaminants from a large amount of sewage to a small amount of pure water by initiating using the reductant, and no extraction of the organic phase is required, the time for purification is reduced, and the energy consumption for purification is also reduced.

Provided is a preparative separation-purification method in which an eluting solvent is passed through a trap column 20 to elute a target component captured in the trap column and collect the target component through a collection passage 34 into a collection container 21, the method including: a process of transferring the eluting solvent containing the eluted target component from the trap column to the collection container through the collection passage; a process of suctioning the eluting solvent remaining in the collection passage through a suction passage 6 connected to the collection passage; and a process of removing the collection passage from the trap column and the collection container. By this method, the eluate or eluting solvent remaining in the collection passage is prevented from being dropped into the collection container. A backflow of the eluate into the trap column is also prevented.

Techniques disclosed herein can be used to perform a rapid, splitless injection of a sample including SVOCs and VOCs. In some embodiments, a system includes two focusing traps combined in series, one inside of a GC oven and one in a separate oven to concentrate the SVOCs inside of the GC oven and concentrate the VOCs outside of the GC oven. Heating the VOC focusing trap and reversing the flow through both focusers allows splitless injection of compounds boiling from as low as ?100? C. to as high as 600? C. in a single analysis, with a narrow injection bandwidth to optimize both sensitivity and the resolving power of the analyzer.

A sample extraction device and a desorption device for use in gas chromatography (GC), gas chromatography-mass spectrometry (GCMS), liquid chromatography (LC), and/or liquid chromatography-mass spectrometry (LCMS) are disclosed. In some examples, the sample extraction device includes a lower chamber holding a sorbent. The sample extraction device can extract sample headspace gas from a sample vial by placing the sorbent inside the vial and creating a vacuum to increase recovery of low volatility compounds, for example. Once the sample has been collected, the sample extraction device can be inserted into a desorption device. The desorption device can control the flow of a carrier fluid (e.g., a liquid or a gas) through the sorbent containing the sample and into a pre-column and/or a primary column of a chemical analysis device for performing GC, GCMS, LC, LCMS, and/or some other chemical analysis process.

In accordance with embodiments of the present invention, a terpene-rich sample is prepared for terpene analysis using liquid chromatography via an extraction method that takes little time, uses minimal external equipment, and permits direct injection of extracted terpenes into a liquid chromatography instrument for analysis. An embodiment of the invention involves preparing a terpene-containing sample for analysis by liquid chromatography by liquid extraction; heating the liquid extract in a vial that contains a filter medium or solvent; collecting the terpenes in the medium by the vapor pressure forced through the filter from heating; and eluting the collected terpenes into a vial or directly into a chromatography injector.

The present disclosure discusses a method of separating and/or purifying polynucleotides. The method includes injecting a sample into cartridge that is packed with a porous sorbent between opposing frits. Physical properties of the cartridge along with the use of hydrophilic fits allows efficient desalting of biopolymers using a vacuum to pull the sample through the cartridge.

A chemical analysis apparatus that quantitatively determines an object of detection rapidly with high sensitivity, and a pretreatment apparatus and a chemical analysis method used for the chemical analysis apparatus, are provided. The chemical analysis apparatus includes a pretreatment unit that accommodates a molecularly imprinted polymer capable of capturing a polar group-containing molecule included in a specimen. A quantification unit quantitatively determines a component included in the specimen that has been passed through the pretreatment unit.