Device and method for online collection of atmospheric fine particulate matter concentrated solution and measurement of heavy metal elements

A technology for atmospheric fine particles and heavy metals, which is used in measurement devices, sampling devices, and the preparation of samples for testing.

Inactive Publication Date: 2021-05-04
FUDAN UNIV
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Problems solved by technology

However, the determination of the biological toxicity of atmospheric particulate matter is still in the offline detection stage due to the constraints of detection technology and instruments (such as high detection limit), and it ne...

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  • Device and method for online collection of atmospheric fine particulate matter concentrated solution and measurement of heavy metal elements

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Embodiment 1

[0034]Atmospheric particles pass through the cyclone PM2.5 cutting head 7 to screen out particles with a particle size of less than 2.5 microns and enter the dissolution device 7 to remove acid and alkali gases, and the passed particles enter the water tank 9 set at a constant temperature of 45±2 degrees Celsius to wrap water vapor and reach a supersaturated state , the saturated ions are condensed and grow up to 3- in the condensation pipe 14 set to a constant temperature of -19 ± 1 degree Celsius under the suction force of the main airflow vacuum pump 3 under the control of the large-flow mass flow controller 5 50 ± 2 liters / min. The 4-micron liquid droplets pass through the nozzle 19 in the virtual cutter 17, and the liquid droplets are accelerated into the concentrated gas path, while the gas enters the bypass gas outlet and is discharged, so that the particle concentration is increased tenfold. The concentrated liquid droplets are pumped into the biological sampling bottle...

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Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a device and method for online collection of an atmospheric fine particulate matter concentrated solution and measurement of heavy metal elements. The device comprises a float flowmeter, a concentrated airflow vacuum pump, a main airflow vacuum pump, a drying pipe, a mass flow controller, a collision type PM2.5 cutting head, a condensation system machine, a water tank, an electric heating rod, a virtual cutter, a biological sampling bottle, two micro-injection pumps, an automatic sampler, an inductively coupled plasma mass spectrometer and the like. According to the device, particulates are blended into liquid through links of sampling, condensation, concentration and the like, so that the concentration of the particulates is improved by one order of magnitude, the concentration effect is better than that of similar products, and the problems of sample pollution, high reagent loss and the like in a traditional filter membrane collection monitoring method are effectively avoided; and the concentration technology and an inductively coupled plasma mass spectrometry are combined to measure the heavy metal, the detection rate can be greatly increased, the sampling time can be greatly shortened, artificial intelligence atmospheric particulate online detection is possible, and the device and method can be widely applied to environment monitoring.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a device and method for concentrated collection and online measurement of particulate matter. Background technique [0002] PM2.5 refers to particulate matter in the atmosphere with an aerodynamic equivalent diameter less than or equal to 2.5 microns, also known as inhalable particulate matter. Although PM2.5 is only a small component in the earth's atmosphere, it has an important impact on air quality and visibility. Atmospheric PM2.5 has a small particle size and a large specific surface area, contains a large amount of toxic and harmful substances, has a long suspension time in the atmosphere, and has a long transmission distance. Therefore, the negative impact on human health and the quality of the atmospheric environment cannot be ignored. [0003] In recent years, my country's atmospheric PM2.5 pollution has been serious, resulting in a sharp i...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N1/28G01N1/40
CPCG01N1/2202G01N1/286G01N1/40G01N1/4022G01N2001/2223G01N2001/4033
Inventor 陈建民尚晓娜康慧慧孙剑峰李丹李凌
Owner FUDAN UNIV
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