A kind of gas flow type quantitative concentration sampling device and method

Abstract

The invention provides an airflow type quantitative concentration and sample feeding device and method. The device comprises a needle cylinder, a piston and a needle head, wherein the needle cylinderis internally provided with an upper hollow cylinder and a lower hollow cylinder; the diameter of the lower hollow cylinder is smaller than that of the upper hollow cylinder; the piston is arranged inthe lower hollow cylinder; the upper hollow cylinder and the lower hollow cylinder are provided with measurement ranges respectively. The method comprises the following steps: sealing the needle headthrough a rubber plug and transferring a solvent into the upper hollow cylinder; discharging bubbles in the needle head by utilizing a fine iron wire; transferring an extracting solution into the upper hollow cylinder; blowing nitrogen in a draught cupboard; then taking the solvent and washing an inner wall of the upper hollow cylinder for three times; quantitatively concentrating until the volume is 2muL; inserting a needle handle into the lower hollow cylinder; taking off the rubber plug; carrying out manual sample feeding. The airflow type quantitative concentration and sample feeding device and method have the advantages of simple structure, low cost, rapidness and convenience for operation and effectiveness.

Description

technical field [0001] The invention relates to the technical field of pretreatment, in particular to an air flow quantitative concentration sampling device and method. Background technique [0002] The main purpose of sample pretreatment is to remove many interfering substances in the sample matrix through the process of extraction, purification and concentration, so that the target substance to be tested in the sample can meet the standard of instrument detection, so as to complete the instrument detection. [0003] Traditional sample pretreatment techniques include Soxhlet extraction, liquid-liquid extraction, etc. In order to improve the shortcomings of these methods such as time-consuming, cumbersome operation, and large consumption of organic solvents, many new sample pretreatment techniques have emerged, such as ultrasonic-assisted extraction, microwave-assisted extraction, pressurized solvent extraction, and supercritical fluid extraction. [0004] Although these te...

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Problems solved by technology

[0006] However, these enrichment techniques have disadvantages such as time-consuming, complicated operation, large-scale equipment, and high cost, and their concentration ratio still cannot meet the detection requirements for trace substances.

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