CN104865175A - Method for detecting concentration of PM2.5 (particulate matter) in air - Google Patents

Abstract

The invention relates to a method for detecting concentration of PM2.5 (particulate matter) in air and belongs to the field of air treatment. Firstly, PM2.5 and larger particulate matters are separated, air flows through a cutter at a certain flow speed under the action of a sucking pump, larger particles are intercepted by components coated with oil due to large inertia, and most of fine particles with smaller inertia pass by with air flow; residual fine particles are dispersed in filtered pure distilled water, and a sample with certain concentration is prepared; absorbance of a standard solution is measured; the solution is placed in a colorimetric tube, and the concentration corresponding to absorbance of the standard solution is measured; a reagent is added to the solution, and the reagent can have a chemical reaction with a carbon element and a salt element in the fine particles, so that the photochromic quantity is displayed, and a corresponding concentration display value can be displayed. The method has the advantages of cost saving, simplicity in operation, time saving and labor saving.

Description

PM2.5 concentration detection method in a kind of air

Technical field

The invention discloses PM2.5 concentration detection method in a kind of air, belong to air-treatment field.

Background technology

PM2.5 refers to that in air, diameter is less than or equal to the particle of 2.5 microns also referred to as entering lung particle.In February, 2013, national scientific and technical terminology validation board is by the Chinese called after fine particle of PM2.5.Although fine particle is the component that in earth atmosphere composition, content is little, it has important impact to air quality and visibility etc.Fine particle particle diameter is little, and specific surface area is large, active strong, easily attach poisonous and harmful substances (such as, heavy metal, microorganism etc.), and the residence time is in an atmosphere grown, fed distance is far away, thus larger on the impact of health and atmosphere quality.

At present, the method for PM2.5 Concentration Testing in air is mainly contained: gravimetric method, β radiation absorption principle.Although wherein gravimetric method cost is low, be the most direct, the most reliable method, but require that labor workload is large, need laboratory to dry before and after filter membrane sampling and weigh, manually change paper and sampling, the concentration of hand computation PM2.5, automaticity is low, is not suitable for carrying out remote monitoring.And the advantage that β radiation absorption principle 5.2 β radiation absorption principle β radiation absorption principle automonitor measures PM2.5 is that requirement sample size is little, according to actual needs, sampling time, 1 ~ 99min was adjustable, per hourly can automatically draw a Monitoring Data, the situation of change of PM2.5 concentration in real-time reflection air, and can data transmission be carried out, be conducive to remote monitoring and automatically control, and greatly reduce labor workload, but to be relative cost higher for its shortcoming.

Summary of the invention

The problems such as the present invention is more loaded down with trivial details, time-consuming around detecting at present PM2.5 concentration operation in air, and the large or cost of artificial amount is higher, provide a kind of air PM2.5 concentration detection method, achieve at lower cost, simple to operately to detect, can effectively apply in practice with this.

In order to achieve the above object, the technical solution adopted in the present invention is:

(1) by PM2.5 and larger particulate separation: under the effect of aspiration pump, air flows through cutter with certain flow velocity, larger particle has been coated with oily parts because inertia is large and has been retained, and the fine grained overwhelming majority that inertia is less is passed through along with air stream;

(2) solution is configured: being scattered in by residual fine particle in the pure distilled water through filtering, being configured to that there is certain density style;

(3) measurement standard solution absorbance: be positioned in color comparison tube by this solution, measures the concentration corresponding to absorbance of this standard solution;

(4) measure the concentration of fine particle thing: in this solution, add reagent, reagent can with the carbon in fine particle, salt element generation chemical reaction, thus display light colo(u)r specification, then have corresponding concentration displayed value and show.

The reagent added is developer, and PBS is damping fluid, and described developer is citric acid, ED-TA disodium salt, ProcLin-300, the one in sodium thiosulfate.

The invention has the beneficial effects as follows:

(1) simple to operate, save time, do not need the man power and material of at substantial;

(2) the method is in concrete utilization process, and cost is low, does not incur great expense;

(3) the method is in practice process, and the concentration value obtained is accurate, and error is little.

Embodiment

First by PM2.5 and larger particulate separation, under the effect of aspiration pump, air flows through cutter with certain flow velocity, and larger particle has been coated with oily parts because inertia is large and has retained, and the fine grained overwhelming majority that inertia is less is passed through along with air stream; Again residual fine particle being scattered in the pure distilled water through filtering, being configured to that there is certain density style; Then measurement standard solution absorbance, is positioned in color comparison tube by this solution, measures the concentration corresponding to absorbance of this standard solution; Finally measure the concentration of fine particle thing, in this solution, add reagent exactly, reagent can with the carbon in fine particle, salt element generation chemical reaction, thus display light colo(u)r specification, then have corresponding concentration displayed value and show.

Example 1

First, 50m is collected ³air in a large container, under the effect of aspiration pump, air flows through cutter with certain flow velocity, larger particle has been coated with oily parts because inertia is large and has been retained, the fine grained overwhelming majority that inertia is less is passed through along with air stream, enter in another container, disperse 30m in this embodiment ³distilled water, add PBS damping fluid, citric acid reacts with it, and the color of generation and the concentration of standard compare, and measuring PM2.5 concentration value is 10mg/L.

In this air, PM2.5 concentration detection method, simple to operate, saves time, and do not need the man power and material of at substantial, cost is low, does not incur great expense, and the concentration value obtained is accurate, and error is little.

Example 2

First, 50m is collected ³air in a large container, under the effect of aspiration pump, air flows through cutter with certain flow velocity, larger particle has been coated with oily parts because inertia is large and has been retained, the fine grained overwhelming majority that inertia is less is passed through along with air stream, enter in another container, disperse 30m in this embodiment ³distilled water, add PBS damping fluid, ED-TA disodium salt reacts with it, and the color of generation and the concentration of standard compare, and measuring PM2.5 concentration value is 10mg/L.

In this air, PM2.5 concentration detection method, simple to operate, saves time, and do not need the man power and material of at substantial, cost is low, does not incur great expense, and the concentration value obtained is accurate, and error is little.

Example 3

First, 50m is collected ³air in a large container, under the effect of aspiration pump, air flows through cutter with certain flow velocity, larger particle has been coated with oily parts because inertia is large and has been retained, the fine grained overwhelming majority that inertia is less is passed through along with air stream, enter in another container, disperse 30m in this embodiment ³distilled water, add PBS damping fluid, ProcLin-300 reacts with it, and the color of generation and the concentration of standard compare, then measuring PM2.5 concentration value is 16mg/L.

In this air, PM2.5 concentration detection method, simple to operate, saves time, and do not need the man power and material of at substantial, cost is low, does not incur great expense, and the concentration value obtained is accurate, and error is little.

Claims (2)

1. a PM2.5 concentration detection method in air, is characterized in that:

(1) by PM2.5 and larger particulate separation: under the effect of aspiration pump, air flows through cutter with certain flow velocity, larger particle has been coated with oily parts because inertia is large and has been retained, and the fine grained overwhelming majority that inertia is less is passed through along with air stream;

(2) solution is configured: being scattered in by residual fine particle in the pure distilled water through filtering, being configured to that there is certain density style;

(3) measurement standard solution absorbance: be positioned in color comparison tube by this solution, measures the concentration corresponding to absorbance of this standard solution;

(4) measure the concentration of fine particle thing: in this solution, add reagent, reagent can with the carbon in fine particle, salt element generation chemical reaction, thus display light colo(u)r specification, then have corresponding concentration displayed value and show.

2. PM2.5 method in a kind of air according to claim 1, is characterized in that: the reagent added is developer, and PBS is damping fluid, and described developer is citric acid, ED-TA disodium salt, ProcLin-300, the one in sodium thiosulfate.