KR20140010697A - Passive air sampler - Google Patents

Abstract

The present invention relates to a passive air sampler characterized by comprising; a case with open one side and the other side having a hole; a cover positioned in separation from one side of the case; a connecting member connecting the case and the cover; and a polyurethane filter and a glass fiber filter inside the case to filter the air flowing into the case through the space between the case and the cover. The passive air sampler according to the present invention can simultaneously collect residual organic contaminants or semi-volatile organic compounds formed in a gas phase/ particulate phase, and air can flow into the inside of the case more efficiently so as to be used usefully since the case of the sampler is shaken by wind.

Description

{PASSIVE AIR SAMPLER}

The present invention relates to a multipurpose passive standby collector for monitoring persistent organic pollutants.

Active air samplers have been used extensively to collect persistent organic pollutants (POPs) or semi-volatile organic chemicals (SVOCs) in the atmosphere. However, the active standby air collector is relatively expensive and requires continuous power supply, so the development and use of an alternative passive air sampler (PAS) is increasing. Manual stand-bys are advantageous in that they can be installed in multiple locations at the same time because they are cheap and do not require power supply. Recently, a polyurethane foam-passive waiting collector (PUF-PAS) is widely used to collect persistent organic pollutants or semi-volatile organic compounds.

FIG. 1 schematically shows a cross section of a polyurethane foam-passive waiting collector (PUF-PAS) which has been developed by Environment Canada in the past and is used globally. Referring to FIG. 1, the conventional PUF-PAS includes a vertically penetrating fixed shaft 40, a cover 20, a polyurethane foam filter 30, and a case 10, The urethane foam filter 30 and the main body 10 are fixed to the fixed shaft 40 by a fixing member 41, respectively. The PUF-PAS can be fastened to the fixing bracket 50 by passing the fixing shaft 40 through the fixing bracket 50 and fixing the lid 20 inside and outside with the fixing member 41. [ The lid 20 and the main body 10 are spaced apart from each other so that external air can be introduced therebetween (refer to a large arrow), and the introduced external air passes through the filter 30 to the hole 11 of the main body 10 Where the residual organic or contaminant organic compound material is adsorbed to the filter 30.

This device is designed to linearly adsorb a semi-volatile organic compound to a polyurethane foam to reflect the atmospheric concentration level. Before the pollutant reaches the adsorption equilibrium, the polyurethane foam is recovered and the adsorption amount is analyzed. A relatively reliable long-term average concentration can be obtained by dividing the value by the sampling rate.

However, since the conventional PUF-PAS is mainly used for collecting the gas phase sample only, the particle concentration can not be calculated and the case 10 is fixed to the fixed shaft 40, so that the inflow amount of the external atmosphere is limited.

In addition to the PUF-PAS, the semi-permeable membrane device (SPMD) and resin-passive air sampler (PAS), which are used as passive waiting gauges, also suffer from the problem of underestimating the concentrations of highly sensitive and volatile substances .

Therefore, it is necessary to develop a passive waiting collector capable of simultaneously collecting persistent organic pollutants or semi-volatile organic compounds distributed in the gas phase as well as in the particulate matter, and compensating the disadvantages of the existing passive waiting collector.

It is an object of the present invention to provide a passive waiting collector capable of simultaneously collecting residual organic pollutants or semi-volatile organic compounds in the air in the gas phase / particulate state.

In order to achieve the above object,

A case in which one side is opened and a hole is formed on the other side,

A cover spaced from the one side of the case,

A connecting member for connecting the case and the cover,

And a polyurethane foam filter and a glass fiber filter disposed inside the case and filtering the air introduced into the case through the space between the case and the cover.

The passive waiting collector according to the present invention can simultaneously collect residual organic pollutants or semi-volatile organic compounds composed of a gas phase / particulate phase, and the case of the collector is shaken by the wind, so that air can be efficiently introduced into the case So it can be useful.

1 is a schematic cross-sectional view of a polyurethane foam-passive waiting collector (PUF-PAS) developed by the Canadian Ministry of Environment.
2 is a schematic cross-sectional view of an air sampler according to one embodiment of the present invention.
3 is a schematic side view of an air sampler according to one embodiment of the present invention.
Figure 4 is a photograph of an atmospheric sampler according to one embodiment of the present invention.
5 is a photograph of a place where a plurality of waiting collectors according to one embodiment of the present invention are installed.
FIG. 6 is a graph showing the compounds in the gaseous phase in the collected polycyclic aromatic hydrocarbons, showing the linearity of the detection amount according to the collection period.
FIG. 7 is a graph showing compounds among compounds distributed in the form of particles in the collected polycyclic aromatic hydrocarbons, showing the linearity of detection amount according to the collection period.

Hereinafter, the present invention will be described in more detail with reference to the drawings according to embodiments of the present invention, but the scope of the present invention is not limited thereto.

A cross section of a passive waiting collector according to one embodiment of the present invention is schematically shown in FIG.

Referring to FIG. 2, the passive waiting collector of the present invention includes a case 100 having one side opened and a hole 110 formed on the other side, a cover 200 spaced from the one side of the case 100, A connection member 500 for connecting the cover 100 and the cover 200 to each other and for filtering the air introduced into the case 100 through the space between the case 100 and the cover 200, A polyurethane foam filter 300, and a glass fiber filter 400.

The case 100 has a shape in which one side is opened, and may be, for example, a cylinder, a box, a hemisphere or the like having one side opened. A hole 110 may be formed on the other side of the case 100, and the number of the holes 110 may be one or more, and the size is not particularly limited.

The cover 200 is spaced apart from one side of the case 100 and air can be introduced between the case 100 and the cover 200. The cover 200 may include a curved portion that is curved around the case 100 toward the case 100 to guide the inflow air into the case 100. [ The flow of the air introduced from the outside through the bent portion is directed to the inside of the case 100.

The case 100 and the cover 200 are connected by the connecting member 500 and the distance between the case 100 and the cover 200 can be adjusted by adjusting the size of the connecting member 500.

The case 100 is suspended from a fixed cover 200 so that it can be moved (moved) by an external force.

Specifically, the case 100 and the cover 200 can be connected so that the case 100 can be moved in the uniaxial direction (X axis) or the both axis directions (X, Y axis), and preferably, So that the case 100 can be moved.

In this way, the connecting member 500 may be configured such that at least one of the one end and the other end is not completely fixed, that is, only the movement in the Z-axis direction is restricted so that the case 100 can be shaken.

FIG. 3 schematically shows a side view of an air sampler according to an embodiment of the present invention. 3 is a perspective view illustrating an example of a connection between the case 100 and the cover 200. The scope of the present invention is not limited thereto.

3 (a), the case 100 and the cover 200 are connected by a connecting member 500, and one end of the connecting member 500 is connected to the inner plate 210 of the cover 200 And the other end thereof is connected to the side portion of the case 100. The other end of the case 100 is not completely fixed to the case 100 so that the case 100 can be shaken by an external force. In order to prevent the other end of the connecting member 500 from being fixed to the case 100, the fixing member 510 may be fixed to the connecting member 500 without being fixed to the case 100 Can be used. 3 (a), one end of the connecting member 500 is fixed to the cover. However, the connecting member 500 may have both one end and the other end fastened to the cover 200 and the case 100 It may be a shape that is not completely fixed, another end fixed to the case 100 is fixed, and one end that is fastened to the cover 200 is not completely fixed.

3 (b), when the case 100 is rotated about the connecting member 500 as shown in FIG. 3 (b), the cover 200 and the case 100 are rotated in the wind direction, So that a larger amount of air can be introduced into the case 100. [0050]

Referring again to FIG. 2, air introduced into the case 100 is discharged through the holes 110 as indicated by a thick arrow. The inflow air may pass through the glass fiber filter 400 and the polyurethane foam filter 300 in the case 100 and the glass fiber filter 400 may pass through the glass fiber filter 400 and the polyurethane foam filter 300, Residual particulate matter or semi-volatile organic compound particulate matter 700 is filtered in the polyurethane foam filter 300 and the gas phase residual organic pollutant or the semi-volatile organic compound material is filtered.

The position of the polyurethane foam filter 300 and the glass fiber filter 400 in the case 100 is not particularly limited but preferably the glass fiber filter 400 is placed on the basis of the polyurethane foam filter 300 And may be located adjacent to one open side of the case 100. In the air sampler of this type, the air introduced from the outside passes through the glass fiber filter 400, and then passes through the polyurethane foam filter 300.

The polyurethane foam filter 300 and the glass fiber filter 400 may be installed to have a predetermined position in the case 100 through the support members 520 and 530, respectively, the polyurethane foam filter 300 and the glass fiber filter 400 may be located perpendicular to the direction from the one side toward the other side. The polyurethane foam filter 300 and the glass fiber filter 400 may be configured to completely separate the interior of the case 100 from the intermediate and lower spaces, upper and intermediate spaces, respectively.

The passive waiting collector according to the present invention configured as described above can be fixed to the fixing bracket 530 through a fixing member 540, for example.

Example

2, a cylindrical stainless steel case 100 having a lower end diameter of 18 cm and a plurality of holes 110 at a lower end thereof is manufactured. A support member 520 having a height of 6 cm is installed inside the case 100 And a polyurethane foam filter 300 was provided thereon. Further, a space (height 6 cm) was floated above the polyurethane foam filter 300 to provide a supporting member 530, and a glass fiber filter 400 was provided on the supporting member 530.

One end of the connecting member 500 was fixed to the inner side plate 210 of the cover 200 and the other end was fastened to form a waiting collector so that the case 100 could be shaken by the wind. The standby collector was fixed using the fixing bracket 600 and the fixing member 540. [ FIG. 4 shows the manufactured standby collector.

Experimental Example

Sixteen waiting collectors manufactured in the above embodiment were installed in a row on the roof of a building in Ulsan National University of Technology, Ulsan, Korea (see FIG. 5), and the filters of two standby collectors were collected every 15 days for 120 days 8 times). Polyaromatic hydrocarbons (PAHs), which are representative anti-volatile compounds, were selected as analytical compounds. Among them, 16 kinds of polycyclic aromatic hydrocarbons shown in the following Table 1 were selected by EPA.

<Analysis method>

Sixteen kinds of polycyclic aromatic hydrocarbons were extracted from a polyurethane foam filter and a glass fiber filter recovered from a passive waiting sampling system including an air sampler of the Experimental Example using a Soxhlet and purified by silica gel to remove the interfering substances, And analyzed with a chromatograph / mass spectrometer.

<Result>

The linear absorption periods were calculated for the 16 polycyclic aromatic hydrocarbons. A linear regression analysis of the sample collection period and the amount of adsorbed individual substances assumed that linear absorption took place during the sampling period for items with a coefficient of determination of 0.5 or higher, 6 and 7, respectively. Referring to FIG. 6, in the case of the gas phase, mainly ten kinds of substances were detected, and eight kinds of substances except for acenaphthylene and acenaphthene (naphthalene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, Anthracene, and chrysene) exhibited relatively high linearity over the entire sampling period (120 days). Referring to FIG. 7, in the case of particulate matter, substances having a larger molecular weight than those in a gas phase were mainly detected, and 14 kinds of substances except naphthalene and fluorene showed linearity.

From the above results, it is judged that the atmospheric water sampler according to the present invention is suitable for separating and collecting the particulate and gas phases separately.

10: Case 11: Hole
20: cover 30: polyurethane foam filter
40: fixed shaft 41: fixed member
50: fixing bracket
100: Case 110: hole
200: cover 210: inner plate
300: polyurethane foam filter 400: glass fiber filter
500: connecting member 510: fixing member
520, 530: Support member 540: Fixing member
600: Fixed bracket

Claims (7)

A case in which one side is opened and a hole is formed at the other side,
A cover spaced apart from the one side of the case,
A connection member connecting the case and the cover;
Located in the case, the manual standby collector, characterized in that it comprises a polyurethane foam filter and a glass fiber filter for filtering the air flowing into the case through the case and the cover.
The method of claim 1,
And the air introduced into the case is discharged to the hole.
The method of claim 1,
Wherein the cover includes a bent portion around which the periphery of the cover is bent toward the case.
The method of claim 1,
Wherein the glass fiber filter is located adjacent to the one side of the case with respect to the polyurethane foam filter.
The method of claim 1,
Wherein the polyurethane foam filter and the glass fiber filter are positioned perpendicular to a direction from the one side to the other side of the case.
The method of claim 1,
The case is a manual standby collector, characterized in that shaking by the external force.
7. The method according to any one of claims 1 to 6,
Wherein the holes are two or more.

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