Combined air exhaust-type dioxin pretreatment device

Abstract

The invention discloses a combined air exhaust-type dioxin pretreatment device. The device comprises a first cylindrical container which is provided with an inlet and an outlet and is provided with an expanding structure at the upper part and a purifying filled column below the expanding structure and in the first cylindrical container, a second cylindrical container which is provided with an outlet and an inlet hermetically connected to the outlet of the first cylindrical container and is provided with an expanding structure at the upper part and a separating filled column below the expanding structure and in the second cylindrical container, a three-way joint of which a first interface is hermetically connected to the outlet of the second cylindrical container and a second interface is used for outputting a treated liquid, and an air exhaust device which is connected to a third interface of the three-way joint. The combined air exhaust-type dioxin pretreatment device realizes fast and efficient separation and purification of a dioxin sample and improves dioxin sample pretreatment efficiency.

Description

technical field [0001] The invention relates to a pretreatment device for rapid analysis, in particular to a pretreatment device for rapid analysis of organic pollutants. Background technique [0002] Dioxin-like compounds are the general term for Polychlorinated dibenzo-p-dioxins (PCDDs) and Polychlorinated-dibenzofurans (PCDFs), which are currently known to be the most toxic one of the compounds. Due to the low dose, refractory degradation and easy bioaccumulation of dioxin-like compounds, the detection and analysis of dioxin-like compounds have attracted extensive attention. On November 11, 2004, the "Stockholm Convention" on persistent organic pollutants (POPs) came into force in my country. The "Convention" requires parties to conduct research and control on the chemical substances in the list attached to the Convention from the date of entry into force, including dioxins. [0003] Dioxins and their analogues have many isomers, and they usually exist in ultra-trace l...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this pre-analytical treatment technology is that it is necessary to use a complete set of commercial equipment (including solid-phase extraction and concentrator), and this pre-analytical treatment has high requirements for the tightness of the column system, thereby increasing the dioxin Pretreatment cost of British samples

The shortcoming of this method and device is: 1) the purification ability to sulfur-containing interference substances is insufficient, and it is not applicable to dioxin samples with high sulfur content

2) Since alumina, Floris and composite silica gel are all on the same chromatography column, they cannot be separated. In the last step, when the most polar dichloromethane elution column system is used, it is very likely that the composite silica gel column will Residual interfering substances on the surface are eluted together with the target dioxin, thus affecting the detection results of dioxin, especially not suitable for dioxin-containing samples with complex matrices

[0007] Among the above-mentioned three published patent documents, the methods disclosed in the first and second patent documents must realize rapid pretreatment of dioxin samples through commercially available expensive instruments, which will greatly improve the pretreatment of dioxin samples. processing cost

The method and device disclosed in the third patent document may introduce interfering substances when purifying dioxin samples in complex matrices, thereby affecting the detection results of dioxins

Images