UA69801U - Method for determination of nanoparticles in air - Google Patents

Abstract

A method for determination of nanoparticles in air includes mixing of aerosol of nanoparticles with volatile absorber in state of vapor in chamber with following cooling of mix and study of nanoparticles. Mixing of aerosol of nanoparticles with vapors of absorber is carried out in elastic chamber to which one first pumps in absorber, and then – aerosol of nanoparticles. After mixing those the elastic chamber is with alternation repetitively heated and then cooled till formation of suspension. The study of nanoparticles of suspension is carried out by means of electronic microscopy.

Description

Description of the invention

The useful model belongs to medicine, namely to industrial hygiene, and can be used to conduct conimetric studies of nanoparticles, including to assess the aggressiveness of the dust and gas environment.

There is a known method of determining dust in the air, including in the air of an industrial zone, which involves gravimetric sampling of air samples followed by microscopic analysis of the dispersed composition and morphology of dust particles using an immersion lens and an ocular micrometer (11.

The disadvantages of this method are that it does not allow the indication of particles of 7/5 ultramicroscopic sizes, which are measured in nanometers and lie beyond the resolution of light microscopy. Nanoparticles of most elements have such dimensions that they are not visible under light microscopy and are not subject to visual identification.

There is a known method of determining nanoparticles in the air, which includes gravimetric sampling of air samples on AFA - VP - 10 filters, followed by the introduction of nanoparticles in a complex with a matrix into a solution of distilled water by release from the matrix, purification by centrifugation from pollutants and identification of nanoparticles by electron microscopy ( 21.

The disadvantages of this method are that part of the nanoparticles, having entered the solution together with the matrix, remain in the matrix in the future, which reduces the level of accuracy of research.

The closest method, which is used for the same purpose as the one claimed, is the method in which the experimental aerosol sample is mixed with an absorber - a gas-vapor mixture in a receiver chamber, in particular using a vacuum discharge pump, condensed in a refrigerating device, the condensate is directed into measuring cuvette and record light scattering according to Tyndall's principle. Moreover, the study of the physical parameters of nanoparticles is carried out by the amount of optical scattering of a beam of coherent light when observing the Tyndall cone in the solid angle Ж). The specified method is selected as a prototype.

The disadvantage of this method is the insufficient level of methodology due to the complexity of its application in non-laboratory conditions.

The reasons preventing the achievement of the expected technical result when using the known method include the fact that there is a partial loss of nanoparticles as a result of complex technological operations associated with the movement of the aerosol from the receiver chamber to the measuring cuvette, which reduces the accuracy of the measurement.

The basis of a useful model is the task of improving the known method in which, by simplifying the structure of the device aimed at reducing the loss of nanoparticles in the aerosol, an increase in the methodicality and accuracy of the research is achieved.

When solving the technical problem, it was taken into account that when nanoparticles are mixed with liquid vapor and subsequent cooling of the resulting mixture, nanoparticles, which are condensation nuclei, transfer the vapor from the gaseous phase to the liquid phase with the formation of a colloidal solution of nanoparticles.

The task is solved by the fact that the method of determining nanoparticles in the air includes mixing an aerosol of nanoparticles with a volatile absorber in a vapor state in a chamber followed by cooling the mixture and studying the nanoparticles, while mixing an aerosol of nanoparticles with vapors of the absorber is carried out in an eplastic chamber, into which the absorber is first injected , and then an aerosol of nanoparticles, and after their mixing, the elastic chamber is alternately, repeatedly, first heated, and then cooled to form a suspension, the study of suspension nanoparticles is carried out using electron microscopy.

It is the combination of the given known features and the set of essential features of the claimed method that provides a significant improvement in the accuracy and methodology of the research.

The essence of the proposed useful model is explained by the drawings: in Fig. 1 - Structural diagram of the method of determining nanoparticles in the air;

Fig. 2 - Structural diagram of the heating of the elastic chamber;

Fig. C - Structural diagram of the cooling of the elastic chamber. because The method of determining nanoparticles in the air is carried out as follows.

The elastic chamber (Fig. 1), capable of changing its volume, depending on the amount of aerosol in it, and on the change in gas pressure when the temperature of the aerosol changes, into which a certain amount of volatile liquid (absorber) is previously introduced, is fed using a sampler of the injectable type aerosol of nanoparticles. After the 65 samples are taken, the elastic chamber is alternately placed in hot (Fig. 2) and cold water (Fig. 3) to heat and

IM and spades

NRU SEND. is

Yi lin 7 as SE - No

TIR "b rve odi vyv lin 0 EV Lnenm PIL in Y

WHEEL; shrinking 2 iy

Ge Shi pd, yt 70 blew Oh, t

Those p Vr NT and: Shields

IPT m now

OM dki shko, KYIV ethics

DON'T GO WHERE I'M GOING 7

Fig. 2

VYN OA,

EILIBILININN KN

Mr. in Java

Ko no EN

RE 2020 NENNY,

UN CASH

She TsevKhaYa and ay -y Zheisheenna 1 osuspanziv Z spuvinivmy

IN NOT VVI

- («RT Z (-5-- KB E 2 2 2 Z - - - « «hop loza otr ol

Fig. WITH

Claims (1)

The formula of the invention and me. and The method of determining nanoparticles in the air, which includes mixing an aerosol of nanoparticles with a volatile absorber in a vapor state in a chamber followed by cooling the mixture and studying nanoparticles, which is characterized by the fact that the mixing of an aerosol of nanoparticles with vapors of the absorber is carried out in an elastic chamber, into which the absorber is first injected, and then - an aerosol of nanoparticles, and after their mixing, the elastic chamber is alternately, repeatedly, first heated, and then cooled until the suspension is formed, the study of nanoparticles of the suspension is carried out using electron microscopy. 60