JP2015045560A - Collector and collection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a collector capable of reducing an impact of a measurement environment, and a collection method using the same.SOLUTION: A collector comprises: a passive sampler 10; a dehumidification material 20; and a passive sampler storing container 30 that can store the passive sampler 10 in a state of filling a periphery of the passive sampler 10 with the dehumidification material 20 and enables a collected substance in the outside air to pass. The passive sampler storing container 30 consists of: a storing container body 32 that is formed into a bottomed cylindrical shape; and a disk-shaped lid member 34 that can close a top aperture of the storing container body 32. Inner surfaces of the storing container body 32 and the lid member 34 regulate a storing space capable of storing the passive sampler 10 and the dehumidification material 20.

Description

  The present invention relates to a collection device for collecting a collected material such as formaldehyde or volatile organic compound (VOC) floating in the atmosphere on a passive sampler, and a collection device for collecting the collected material by the collection device. Concerning the collection method.

  Conventionally, passive samplers that have been exposed to the atmosphere and collected by natural diffusion have been used to collect substances to be collected such as formaldehyde and volatile organic compounds (VOC) floating in the atmosphere ( Patent Document 1). This passive sampler has an adsorbent and a collecting agent provided in the passive sampler, and the concentration of the collected substance is always zero on the collecting inner surface, and the collecting outer surface in contact with the collecting atmosphere having a higher concentration than that. By keeping a constant concentration gradient with the introduction port, the substance to be collected is collected by utilizing the phenomenon of migration and diffusion of the substance concentration.

JP 2003-114176 A

  However, since this passive sampler is held by a holder so as to be exposed to the atmosphere and placed in a measurement environment, there is a problem that the performance of the passive sampler may be significantly deteriorated due to a change in the measurement environment.

  Then, an object of this invention is to provide the collection apparatus which can reduce the influence of a measurement environment, and the collection method using this.

  As a result of intensive studies, the present inventors have found that the amount of passive sampler collected is significantly reduced in a high humidity environment, and have invented the present invention. That is, in order to achieve the above object, the collection device according to the present invention is configured to be able to accommodate the passive sampler, the dehumidifying material, and the passive sampler in a state where the dehumidifying material is filled around the passive sampler. And a passive sampler storage container through which a substance to be collected in the outside air can pass.

  Further, the collection method according to the present invention is a method for collecting a substance to be collected in the atmosphere performed using the collection device, wherein the humidity around the passive sampler is reduced by the dehumidifying material. In the method, the substance to be collected is collected by a passive sampler.

  ADVANTAGE OF THE INVENTION According to this invention, the collection apparatus which can reduce the influence of a measurement environment, and the collection method using this can be provided.

It is sectional drawing which shows schematic structure of the collection apparatus which concerns on one Embodiment of this invention. It is a graph which shows the relationship between the collection amount of a passive sampler, and humidity.

  Next, the collection device concerning one embodiment of the present invention is explained based on a drawing. As shown in FIG. 1, the collection device 1 according to the present embodiment includes a passive sampler 10, a dehumidifying material 20, and a passive sampler housing container 30 that houses the passive sampler 10 and the dehumidifying material 20.

  The passive sampler 10 includes a cylindrical sampler main body 12, an adsorbent 14 that is accommodated in the sampler main body 12 and can adsorb a substance to be collected, and both ends of the adsorbent 14 accommodated in the sampler main body 12. A filter member 16 provided on the outside and plug members 18 provided on both ends of the sampler body 12 are provided.

  The sampler main body 12 is made of porous PTFE having an open area rate through which a substance to be collected in the atmosphere such as formaldehyde can permeate. Moreover, the aluminum ring 20 is affixed on the both ends of the outer peripheral surface of the sampler main body 12 over the perimeter. The adsorbent 14 is made of a material that can adsorb the substance to be collected, and is made of, for example, silica gel or activated carbon impregnated with DNPH. The filter member 16 is formed in a porous shape in which the substance to be collected and its solvent can permeate and the adsorbent 14 cannot penetrate, and is formed of a material insoluble in the solvent of the substance to be collected. Yes. The plug member 18 is made of polyethylene or the like formed in a cylindrical shape, and is provided at both ends of the sampler body 12 so as to prevent the filter member 16 from being detached from the sampler body 12.

  The dehumidifying material 20 is made of a material having dehumidifying properties such as magnesium perchlorate and sodium chloride, and is formed in a granular shape. In addition, in the collection apparatus 1 which concerns on this embodiment, the dehumidification material 20 is not limited to a granular dehumidification material, A well-known dehumidification material can be used.

  The passive sampler storage container 30 includes a storage container main body 32 formed in a bottomed cylindrical shape, and a disc-shaped lid member 34 that can close the upper end opening of the storage container main body 32. A housing space in which the passive sampler 10 and the dehumidifying material 20 can be housed is defined by the inner surface of 32 and the lid member 34.

  The container main body 32 is formed of a porous member having air permeability through which a substance to be collected can pass and capable of restricting the passage of the dehumidifying material 20, and in this embodiment, a metal mesh or polytetrafluoroethylene. It is formed by processing a net into a bottomed cylindrical shape. A fitting hole 33 into which the plug member 18 on one side of the passive sampler 10 can be fitted is formed at the center of the bottom surface of the container main body 32. The upper end edge portion 32a of the container main body 32 is formed to be thin so that the outer diameter is smaller than that of other portions, and is configured to be detachable by a flange 38 and an inlay structure described later of the lid member 34.

  Similarly to the container main body 32, the lid member 34 is formed of a porous member that is capable of passing a substance to be collected and that can restrict the passage of the dehumidifying material 20. Is formed by processing a metal mesh or a polytetrafluoroethylene mesh into a disk shape. A fitting hole 36 into which the plug member 18 on the other side of the passive sampler 10 can be fitted is formed at the center of the lid member 34. A flange 38 is formed on the outer peripheral edge of the lid member 34 so as to protrude downward over the entire circumferential direction. The flange 38 is substantially the same diameter as the outer diameter of the upper edge 32 a of the container body 32. It has an inner diameter.

  Next, a method for collecting a substance to be collected in the atmosphere using the collection device 1 according to this embodiment will be described. In order to collect a substance to be collected in the atmosphere using the collection device 1 according to the present embodiment, first, one end (the plug member 18 on one side) of the passive sampler 10 taken out from the airtight bag is accommodated. The passive sampler 10 is vertically installed in the container main body 32 by being inserted into the insertion holes 33 of the container main body 32. Next, the dehumidifying material 20 is filled in the space between the passive sampler 10 and the inner wall of the container main body 32, and the other end (the plug member 18 on the other side) of the passive sampler 10 is inserted into the insertion hole 36 of the lid member 34. The lid member 34 is attached to the container main body 32 so as to be fitted into the container. Then, the collection device 1 assembled in this way is placed in a desired measurement environment. Thereby, in a state where the humidity around the passive sampler 10 is lowered by the dehumidifying material 20, the substance to be collected is collected by the passive sampler 10 due to the movement diffusion phenomenon. Next, after a predetermined collection time has elapsed, the lid member 34 is removed from the container main body 32, and the passive sampler 10 is collected in an airtight bag. Thereafter, the passive sampler 10 is transported to the measurement chamber, and in the measurement chamber, the amount of collected substances collected in the passive sampler 10 is measured by various known methods.

  FIG. 2 shows the results of collecting the substances to be collected as described above outdoors on a plurality of days with different humidity (summer sunny days with a humidity of about 50% to light days with a humidity of about 75%). FIG. 2 is a graph showing the relationship between the amount of 1,3-butadiene collected by the passive sampler and the humidity at that time, and the collection of the substance to be collected using the collection device 1 according to this embodiment. Measurement results of the collected amount of the collected material and the conventional collection method, that is, collecting the collected material when collecting the collected material without using a dehumidifying material The measurement result of quantity is shown.

  From FIG. 2, it can be seen that in the conventional collection method that does not use a dehumidifying material, the substance to be collected is hardly collected in a measurement environment having a humidity of 50% or more. On the other hand, from FIG. 2, according to the collection method according to the present embodiment using the dehumidifying material 20, the collection amount is approximately the same as that of the conventional collection method in a measurement environment with a humidity of 65% or more. In the measurement environment where the humidity is in the range of about 50 to 60%, the amount of the collected substance is several times greater than that of the conventional collection method, and particularly in the measurement environment where the humidity is in the range of about 50 to 55%. It can be seen that the amount collected is about 7 times the amount collected by the conventional collection method. Here, in the measurement result of the collection method according to the present embodiment, the amount of collection was almost the same as that of the conventional collection method in a measurement environment with a humidity of 65% or more. It is thought that this is because moisture has entered the passive sampler 10 because the amount of moisture present in the atmosphere exceeds the amount of moisture absorbed by the disposed dehumidifying material 20. From the above, the amount of collected material is closely related to humidity, and the amount of passive sampler collected by the conventional collection method is significantly reduced in a high humidity environment with a humidity of 50% or more. In the collection method according to the embodiment, it has been clarified that the influence of humidity in the measurement environment is mitigated.

  As described above, the collection device 1 according to the present embodiment includes the passive sampler 10, the dehumidifying material 20, and the passive sampler storage container 30 that stores the passive sampler 10 and the dehumidifying material 20. Since the substance to be collected can be collected in a state where the humidity around the passive sampler 10 is lowered, the influence of humidity in the measurement environment can be reduced.

  The collection device according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea of the present invention. For example, in the collection device 1 according to the present embodiment, the passive sampler 10 has been described using a tube-type passive sampler. However, the present invention is not limited to this, and various passive samplers can be used. The collection device 1 according to the embodiment can be variously modified according to the type and shape of the passive sampler used.

  Moreover, in the collection apparatus 1 which concerns on this embodiment, although the passive sampler storage container 30 was comprised from the storage container main body 32 and the cover member 34, it is not limited to this, A dehumidification material is enclosed around the passive sampler 10. What is necessary is just to be comprised so that the passive sampler 10 can be accommodated in the state with which 20 was filled. Furthermore, in the collection device 1 according to the present embodiment, the passive sampler container 30 is formed by processing a wire net or a polytetrafluoroethylene net, but the present invention is not limited to this, and the passive sampler container 30 is not limited to this. Any material that can pass through the trapping substance may be used.

  1 collection device, 10 passive sampler, 20 dehumidifying material, 30 passive sampler container

Claims (2)

A passive sampler,
A dehumidifying material,
A passive sampler storage container configured to be able to store the passive sampler in a state where the dehumidifying material is filled around the passive sampler and capable of passing a trapped substance in the outside air. Collector. A method for collecting substances to be collected in the atmosphere using the collection device according to claim 1,
The collection method, wherein the collected material is collected by the passive sampler in a state where the humidity around the passive sampler is lowered by the dehumidifying material.

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