Sampling membrane, sampler and application method for enriching heavy metals in ambient air

A technology of ambient air and application methods, applied in the direction of sampling devices, etc., can solve the problems of difficult elution and extraction of the analyte, large gas extraction resistance, and low mechanical strength, so as to shorten sampling and processing time, small gas extraction resistance, The effect of low blank value

Inactive Publication Date: 2016-08-17
SOUTHEAST UNIV +1
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  • Claims
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Problems solved by technology

[0005] The technical problem mainly solved by the present invention is to provide a sampling film, a sampler and its application method for enriching heavy metals in the ambient air, which can solve the problems of large gas extraction resistance, low mechanical strength, high blank value and sampling problems in the existing sampling methods. After the analyte is difficult to elute and extract, etc.

Method used

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  • Sampling membrane, sampler and application method for enriching heavy metals in ambient air
  • Sampling membrane, sampler and application method for enriching heavy metals in ambient air

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preparation example Construction

[0028] A kind of preparation method of the sampling film of enriching the heavy metal in ambient air, comprises the following steps:

[0029] (1) Dissolve high molecular polymer (at least one of polyphenylene sulfide, cellulose acetate, polystyrene, polycaprolactam, acrylic resin and polyacrylonitrile) in a suitable solvent (N, N-dimethyl At least one of base formamide, tetrahydrofuran, ethanol, acetone, formic acid, water, halogenated hydrocarbons and aromatic hydrocarbons), stirred to form a spinning solution, and then added to the spinning solution relative to the polymer mass 3 ~8% complexing agent (o-phenanthroline, zinc reagent, 8-hydroxyquinoline, dithizone, 1-(2-pyridylazo)-2-naphthol, xylenol orange or copper reagent at least one) as a functional modifier, and adjust the pH value of the spinning solution;

[0030] (2) Using electrospinning technology to make the spinning solution prepared in step (1) into a nanofiber membrane material, then cut the nanofiber membrane...

Embodiment 1

[0034]Preparation of dithizone functionalized polystyrene nanofiber (DZ-PS) filter membrane: take 10% (w / v) PS (polystyrene) dissolved in DMF (N, N-dimethylformamide) and THF ( Tetrahydrofuran) (4:6) mixed solution, after the PS is completely dissolved, add 5% (w / w, relative to the mass of PS) dithizone, and continue stirring with a magnetic stirrer for more than 10 hours. Put it into a glass syringe (soak in 1+9 nitric acid overnight, wash and dry in deionized water), install the needle, install aluminum foil of appropriate size on the receiving plate, and cover the aluminum foil with gauze (soak in 1+9 nitric acid overnight, use deionized water washing and drying). Set the voltage to 17KV, the flow rate to 1.0ml / h, adjust the distance between the receiving plate and the needle to about 25cm, according to about 1ml / 40cm 2 (Amount of spinning solution / receiving area) for electrospinning. The spun nanofibers were cut into circular sheets of appropriate size, lined with a filt...

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Abstract

The invention discloses a sampling membrane and a sampler capable of enriching heavy metals in ambient air and an application method of the sampler. The sampling membrane comprises a nanometer fiber membrane and an air-permeable supporting padding arranged below the nanometer fiber membrane. The sampler comprises the sampling membrane and a sampling clamp; the sampling clamp is composed of an upper cone and a lower cylinder, wherein the upper surface of the cone is horizontal, the cylinder is composed of an upper cylinder and a rotary lower cylinder, the side surfaces of the upper cylinder and the lower cylinder are provided with uniformly distributed vertical ridges, the vertical ridges on the upper cylinder and the lower cylinder are aligned by rotating the lower cylinder, so fixation of the sampling membrane on the horizontal surface of the sampling clamp is realized. After heavy metals in air are acquired by using the sampler, a filter membrane is taken out and put into a centrifuge tube filled with a buffer solution, a solution is used for desorption of the heavy metals on the filter membrane, and after desorption, the solution is determined. According to the invention, detection sensitivity can be substantially improved, pre-treatment of a sample is easy and feasible, and nanometer fiber filter membranes with different functions are used for different detection objects, thereby improving absorption and acquisition efficiency.

Description

technical field [0001] The invention relates to the technical field of atmospheric environment monitoring, in particular to a sampler for enriching heavy metals in ambient air and an application method thereof. Background technique [0002] In recent years, the smog weather has been severe, and the fine particles of air aerosols PM10 and PM2.5 are easy to accumulate toxic heavy metals, acidic oxides, organic pollutants, bacteria and viruses in the air. Such fine particle aerosols can attach to the respiratory tract, Even if it enters the lungs and deposits, it is extremely harmful to human health. Therefore, the hygiene inspection of aerosols is an important part of air pollution monitoring. In particular, some heavy metal elements, such as lead, are common and harmful, but the content in residential areas is usually low and difficult to detect. In order to improve the detection sensitivity, a long sampling time is required, which is time-consuming and laborious. [0003] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/22
Inventor 康学军邓晓燕顾忠泽戎非顾海霞
Owner SOUTHEAST UNIV
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