Sample injection and online pretreatment system and method

Abstract

The invention discloses a sample injection and online pretreatment system and method. The system comprises a punching sample injection device and an online pretreatment device, wherein the punching sample injection device comprises an automatic punching sample injector, a diaphragm rack combined disc, a stepping motor and a controller, wherein the stepping motor and the controller can control themovement and positioning of the automatic punching sample injector and the diaphragm rack combined disc, the punching sample injection device comprises a mechanical arm which is a hollow cylinder, anopenable cabin door is arranged below the mechanical arm, a plurality of grooves are formed in the diaphragm rack combined disc, a diaphragm rack is arranged in each groove, and the punching sample injector can cut a preset to-be-detected diaphragm from a sampling film on the diaphragm rack. The system is convenient in sampling, firm for grasping of samples, and labor-saving, the measurement errors caused by manual film cutting can be reduced, the online pretreatment operation is simple and no solvent impurity pollution exists.

Description

technical field [0001] The invention relates to a sample introduction and online pretreatment system and method, in particular to a sample introduction and online pretreatment system and method for atmospheric particle analysis. Background technique [0002] Phthalic acid esters (Phthalic acid esters or Phthalate esters abbreviated as PAEs, also known as phthalates), is a general term for esters formed by phthalic acid, and is one of the environmental hormones. The amount of phthalate ester pollutants in the atmosphere is generally several times that of polycyclic aromatic hydrocarbons, and its main sources are industrial production, spray paint, incomplete combustion of fuel oil and coal, incineration of plastic waste and agricultural film, etc. PAEs are mutagenic, carcinogenic and teratogenic, and have strong bioaccumulation effects. They can directly enter human and animal bodies through inhalation, diet and skin contact, especially phthalates attached to fine particulate...

AI Technical Summary

Problems solved by technology

Organic solvents and special pre-treatment equipment must be used. For organic solvents, 5-30ml of dichloromethane is required. For pre-treatment equipment, ultrasonic extractors and nitrogen blowers are used, and the operation steps are cumbersome, and solvent transfer requires More than 2 times, the ultrasonic extraction step takes 20-60min, and the nitrogen blowing to 3-6ml takes a long time, the whole pretreatment process is time-consuming and labor-intensive, and the organic solvent is not friendly to the environment and harmful to the human body

[0006] To sum up, the existing technology adopts manual liquid-liquid extraction and liquid phase extraction equipment and methods, the amount of organic solvent used in the pretreatment process is too much, the extraction time is long, and it also violates many restrictions on the use of organic solvents in laboratories by environmental protection regulations, and The extraction process caused the background value of PAEs to be high, which affected the measurement results. Therefore, it is urgent to develop new solid sample pretreatment and sampling technology to meet the new environmental protection work requirements

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