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Method for detecting dioxin-like substances in exhaust gas

A technology of dioxins and detection methods, which is applied in the field of pollutant monitoring, can solve the problems of analysis interference, long operation time and high test cost, and achieves the effects of small relative standard deviation, wide application range and good detection stability.

Active Publication Date: 2020-05-01
江苏微谱检测技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The ambient humidity during the detection of dioxin will affect the detection accuracy. At the same time, the exhaust gas also contains hydrofluoric acid and some halogen atoms. Therefore, it is necessary to eliminate the interference of these substances through effective separation and analysis methods
[0004]The analysis process of dioxin samples mainly includes sample collection, sample pretreatment (mainly extraction and purification), analysis and detection, and data processing and evaluation. Among them, the sample The pretreatment process is a key step to ensure the accuracy and reliability of the analysis results, and it is also the most complicated and time-consuming operation in the analysis process. At present, the pretreatment process in the detection of dioxins has long operation time, laborious, high test costs and hazards. Health and other shortcomings, and there are also problems such as poor detection applicability and low detection accuracy

Method used

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  • Method for detecting dioxin-like substances in exhaust gas
  • Method for detecting dioxin-like substances in exhaust gas
  • Method for detecting dioxin-like substances in exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Embodiment 1 of the present invention provides a method for collecting waste gas samples containing dioxin-like substances. The waste gas is collected by using a dioxin sampler. The dioxin sampler includes a sampling tube, a filter cartridge part, a condensation device, gas-phase adsorption column, collecting bottle; the rear end of the sampling pipe is connected to the filter cartridge part through a conduit, and the rear end of the filter cartridge part is connected to the condenser, and the gas-phase adsorption column is arranged on the outside of the condenser, and the condenser The top is connected with the top of the gas-phase adsorption column; the lower end of the condenser receives the collection bottle.

[0077] Before collecting, the sampler must be pretreated; the sampling tube material is a titanium alloy, and it is cleaned with acetone, toluene, and dichloromethane solvents before sampling; the sampling tube is equipped with a heating device to avoid Durin...

Embodiment 2

[0084] Embodiment 2 of the present invention provides a method for collecting waste gas samples containing dioxins, which is the same as Embodiment 1.

[0085] Embodiment 2 of the present invention also provides a kind of detection method of dioxin-like substance, comprises the following steps:

[0086] (1) Sample extraction: Add 0.4ng of internal standard to the exhaust gas sample, use 60ml of mixed solvent of toluene, acetone and methanol at a pressure of 1.03×10 7 Pa, 165°C, when heating for 10 minutes, statically extract the waste gas sample for 13 minutes, repeat the extraction 3 times, and obtain the extract containing dioxin; the internal standard of the extraction is 37 Cl 4 -2,3,7,8,-T 4 CDF, 13 C 12 -1,2,3,7,8,-P 5 CDF, 13 C 12 -2,3,4,7,8,-P 5 CDF, 13 C 12 -1,2,3,4,7,8,-H 6 CDF, 13 C 12 -1,2,3,6,7,8-H 6 CDF, 13 C 12 -2,3,4,6,7,8-H 6 CDF, 13 C 12 -1,2,3,7,8,9-H 6 CDF, 13 C 12 -1,2,3,4,6,7,8-H 7 CDF, 13 C 12 -1,2,3,4,7,8,9-H 7 CDF, 13 C 12 -...

Embodiment 3

[0091] Embodiment 3 of the present invention provides a method for collecting waste gas samples containing dioxin-like substances, and the collection method is the same as that in Embodiment 1.

[0092] Embodiment 3 of the present invention also provides a kind of detection method of dioxin-like substance, comprises the following steps:

[0093] (1) Sample extraction: Add 0.4ng of internal standard to the exhaust gas sample, use 60ml of mixed solvent of toluene, acetone and methanol at a pressure of 1.03×10 7 Pa, 175°C, when heating for 5 minutes, statically extract the exhaust gas sample for 10 minutes, repeat the extraction 3 times, and obtain the extract containing dioxin; the internal standard of the extraction is 37 Cl 4 -2,3,7,8-T 4 CDF, 13 C 12 -1,2,3,7,8-P 5 CDF, 13 C 12 -2,3,4,7,8-P 5 CDF, 13 C 12 -1,2,3,4,7,8-H 6 CDF, 13 C 12 -1,2,3,6,7,8-H 6 CDF, 13 C 12 -2,3,4,6,7,8-H 6 CDF, 13 C 12 -1,2,3,7,8,9-H 6 CDF, 13 C 12 -1,2,3,4,6,7,8-H 7 CDF, 13 C ...

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Abstract

The invention relates to the technical field of pollutant monitoring, and more specifically relates to a method for collecting exhaust gas samples containing dioxin-like substances. The method uses adioxin sampler to collect the exhaust gas, and the dioxin sampler comprises a sampling tube, a filter cartridge component, a condenser, a gas-phase adsorption column and a collection bottle; the rearend of the sampling tube is connected to the filter cartridge component through a conduit, the rear end of the filter cartridge component is connected to the condenser, the outer side of the condenseris provided with the gas-phase adsorption column, and the top end of the condenser is connected to that of the gas-phase adsorption column; and the lower end of the condenser is connected to the collection bottle. The method for detecting dioxin-like substances in exhaust gas provided by the invention is simple in operation, low in cost, accurate in detection methods, high in accuracy, small in relative standard deviation, good in detection stability and wide in the range of application.

Description

technical field [0001] The invention relates to the technical field of pollutant monitoring, and more specifically, the invention relates to a method for detecting dioxin-like substances in waste gas. Background technique [0002] Persistent organic pollution, as a dangerous toxic pollutant, has become the focus of the international chemical community. As a typical toxic compound with "three effects" (carcinogenic, teratogenic and mutagenic), dioxin has always been one of the focuses of people's attention. The main hazards of dioxin-like substances to the human body are as follows: Chloracne, blackheads, and yellowish cysts are mainly distributed in the periorbital, temporal, behind the ears, and scrotum, and can cause soft tissue connective tissue, Lung, liver, stomach cancer and non-Hodgson's lymphoma; the impact on the reproductive system, can reduce the number of male sperm, can cause testicular deformity, feminization of behavioral responses, etc.; can change female ho...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/12G01N30/30G01N30/60G01N30/72
CPCG01N30/02G01N30/06G01N30/12G01N30/30G01N30/6052G01N30/72G01N2030/062G01N2030/126
Inventor 徐勤东贾梦虹赵俊欢陈卫海魏守良
Owner 江苏微谱检测技术有限公司