Efficient atomized capturing sampler

Abstract

The invention discloses an efficient atomized capturing sampler. The efficient atomized capturing sampler is mainly composed of a liquid storage chamber, an atomized capturing chamber and a gas-mist separation chamber, wherein the liquid storage chamber is used for containing the absorption liquid, the atomized capturing chamber converts the absorption liquid into fine mist of which the grain size has the characteristics of aerosol size, and the gas-mist separation chamber prevents the fine mist from overflowing out the sampler. The fine mist has big-enough exchange contact surface area between the gas-liquid interface, so that the fine mist can be mixed uniformly with the pollutant in the air with high efficiency, the conversation efficiency of the pollutant from gas state to liquid state is improved effectively, and the pollutant in the air of the environment can be efficiently absorbed and captured. The sampler provided by the invention is made of glassy inert material, and is interference-free and pollution-free to the obtained sample, the sampling flow is wide in range and steady, the sample acquisition time is short, the sampling efficiency is high, and the variation of outside environment factors cannot influence sampling; and moreover, the sampler is low in sampling cost, convenient for extracting the samples, and convenient for field and indoor operations.

Description

technical field [0001] The invention belongs to the technical field of air pollutant collection, and in particular relates to a high-efficiency atomization and trapping sampler. The collection objects include volatile and semi-volatile organic gases and atmospheric particles, and are mainly used to collect atmospheric aldehyde and ketone pollutant samples. Background technique [0002] At present, the EPA TO-11A method is generally used in the world to detect the atmospheric concentration of aldehydes and ketones, but the use of silica gel tube sampling in this method has the following defects: (1) The carrier silica gel itself in the silica gel sampling tube is an important source of high molecular weight aldehydes and ketones ; ⑵ oxidants in the air (such as O 3 ) can degrade the DNPH and its derivatives in the sampling tube and affect the quantitative analysis, and the isoprene and O in the air during the sampling process 3 It can also react on the surface of the silica ...

AI Technical Summary

Problems solved by technology

[0002] At present, the EPA TO-11A method is generally used in the world to detect the atmospheric concentration of aldehydes and ketones, but the use of silica gel tube sampling in this method has the following defects: (1) The carrier silica gel itself in the silica gel sampling tube is an important source of high molecular weight aldehydes and ketones ; ⑵ oxidants in the air (such as O 3 ) can degrade the DNPH and its derivatives in the sampling tube and affect the quantitative analysis, and the isoprene and O in the air during the sampling process 3 It can also react on the surface of the silica gel carrier to form formaldehyde and affect the quantification; (3) the sampling flow rate of the silica gel tube is small (generally ≤2L / min), the sampling time is long (≥120min), the production of the DNPH silica gel sampling tube is extremely cumbersome, and it is in the process of storage susceptible to environmental pollution

Other sampling methods, such as glass adsorption tubes and sampling tanks, are mostly used to collect C 5 The above high molecular weight aldehydes and ketones have poor stability after sample collection; although the cryogenic cold trap device has high sampling efficiency (≥90%), its optimal sampling flow rate is only 0.2L / min and the sampling efficiency decreases with the increase of sampling flow rate , Field operation and sample low temperature storage (≤-18°C) and transportation are not easy to achieve; the annular erosion-membrane system can achieve higher sampling flow rate (4-10L / min) and sampling efficiency (82-97%) , but limited to the collection of semi-volatile high molecular weight aldehydes and ketones that coexist in gas / solid state

It can be seen that the existing sampling methods for aldehydes and ketones have their own limitations, and it is difficult to meet the in-depth requirements of scientific research.

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