Apparatus and test method for studying the formation mechanism of persistent organic pollutants

Abstract

The invention discloses a simple reaction device and a test method for studying the formation mechanism of persistent organic pollutants. The device replaces the chromatographic column of the gas chromatograph with the quartz tube used for the reaction, uses the carrier gas to provide the reaction atmosphere, and uses the injection port to realize the precise control of the temperature of the matrix bed reaction zone on the upper part of the quartz tube and the accurate injection of the reactants. The lower part of the quartz tube is filled with an adsorbent (located in a column thermostat at room temperature). After the reaction, the matrix and adsorbent in the tube are obtained, ultrasonically extracted, filtered and concentrated, and then injected for analysis. Compared with the toluene adsorbent used in the traditional tube furnace reaction device, this device is replaced by a non-toxic and harmless adsorbent, which is environmentally friendly, greatly saves reagent costs, and perfectly realizes reactant sampling, vaporization, high-temperature reaction, The simple integration of low-temperature adsorption and flow rate adjustment reduces product loss, shortens the experimental cycle, improves the recovery rate, and makes the experimental results have better reproducibility.

Description

technical field [0001] The invention relates to the research on the formation mechanism of persistent organic pollutants, in particular to a simple device for the formation of persistent organic pollutants and the analysis and test of the pollutants. Background technique [0002] Persistent organic pollutants (POPs) are global pollutants that are environmentally persistent, bioaccumulative, semi-volatile, long-distance transport, and highly toxic (carcinogenic, teratogenic, and mutagenic). According to the "International Stockholm Convention-POPs Convention", POPs can be divided into pesticides (aldrin, hexachlorobenzene, DDT, etc.), industrial chemicals (polychlorinated biphenyls, hexachlorobenzene, polychlorinated naphthalenes, etc.) and production by-products (dioxins, polychlorinated biphenyls, polychlorinated naphthalenes, etc.). Because these POPs have fatal damage to the central and peripheral nervous systems, reproductive systems, and immune systems of humans and an...

AI Technical Summary

Problems solved by technology

Although the reaction temperature range of the tube furnace is wide, which can be as high as thousands of degrees Celsius, the increase of vaporization equipment and trapping devices increases the cost of equipment and solvents, increases the cleaning work of connecting pipelines, and increases the possibility of sample loss. , which reduces sample recovery

In addition, the use of solvents such as toluene increases the toxicity and danger of the system

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