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

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...

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