JP2007101331A - Cascade impactor, and analytical sample acquisition method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cascade impactor, capable of conducting simultaneously quantitative determinations for elementary analysis and ion species analysis, even if the amount of a collected particular substance is a trace amount, and to provide an analytical sample acquisition method that uses the same. <P>SOLUTION: This cascade impactor has an impactor 30, having a flow-in port 30b allowing flow-in of gas containing the particular substance in a lower side, a collection member 32 for collecting the particular substance by making the gas flowing in from the impactor 30 collide therewith, a base plate 34 for supporting the collection member 32, and having a flow-out port 34b allowing flow-out of the gas brought into collision with the collection member, and a collection unit 12. The collection member 32 is constituted of a glass raw material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cascade impactor that collides air with a collection member and causes particulate matter contained in the atmosphere to adhere to the collection member and collects it, and an analytical sample acquisition method using the cascade impactor.

  Conventionally, a cascade impactor is known in which a gas containing particulate matter collides with a filter made of quartz fiber, fluorine resin, polycarbonate resin, or the like, and the particulate matter adheres to the filter and is collected (patent). Reference 1). As shown in FIG. 14, the conventional cascade impactor includes first to third collection units 60, 62, and 64 that can selectively collect particulate matter in a gas according to particle size and type, and are stacked in layers. It is configured. The first collection unit 60 includes an impactor 66 having an inflow port 66a through which a gas can flow, and a filter 68 that collides the gas flowing in from the inflow port 66a and attaches particulate matter in the gas to collect the gas. A base plate 70 that supports the filter 68 and has an outlet 70a through which gas that collides with the filter 68 can flow out. The second and third collection units similarly include impactors 72 and 78, and a filter. 74 and 80, and base plates 76 and 82, respectively. Further, an air pump (not shown) is connected below the cascade impactor, and gas is sucked into the cascade impactor from above, and a constant flow rate gas is allowed to pass through each of the collection units 60, 62, 64. Here, the first to third collection units 60, 62, and 64 are configured so that the diameters of the inflow ports 66a, 72a, and 78a become lower, and when a constant flow rate of gas is sucked by the air pump, The filter of the upper collection unit is configured to collect particulate matter having a larger particle size.

  Particulate matter collected by this cascade impactor is analyzed by ion species analysis using an ion chromatograph analyzer (hereinafter referred to as “IC analyzer”) or by a high frequency inductively coupled plasma mass spectrometer (hereinafter referred to as “ICP mass analyzer”). Or a high-frequency inductively coupled plasma emission spectrometer (hereinafter referred to as “ICP emission analyzer”), and quantitative analysis can be performed simultaneously with these ion species analysis and elemental analysis.

  When the collected particulate matter is used for ionic species analysis, the filter in which the particulate matter is collected is placed in, for example, a 12 ml plastic tube, and about 10 ml of ultrapure water is added thereto to impart ultrasonic vibration. Thus, the particles are desorbed from the filter, and the ionic species are dissolved in ultrapure water, and this is filtered through, for example, a nitrocellulose membrane filter to obtain a sample for analysis.

Also, when using the collected particulate matter for elemental analysis, put the filter in which the particulate matter is collected into a fluororesin container, add hydrofluoric acid, perchloric acid and nitric acid to this, Decompose using a microwave, transfer the decomposed solution to another fluororesin container, heat to dry and solidify, dissolve the solid in 2% nitric acid, for example nitrocellulose membrane filter The sample for analysis is obtained by filtration through the filter.
Japanese Patent Laid-Open No. 2004-245795, FIG.

  However, when performing the elemental analysis on the particulate matter collected by the conventional cascade impactor, since the complicated chemical treatment as described above is required, the amount of the particulate matter collected by the filter is small. In the case of a trace amount, quantitative analysis cannot be performed at the same time. Even in the case of ionic species analysis, depending on the filter, the collected particulate matter cannot be completely removed from the filter, so that quantitative analysis cannot be performed at the same time. In addition to these elemental analysis and ion species analysis, it is possible to perform quantitative analysis of collected particulate matter, but in that case, the filter contains moisture when collecting particulate matter. These filters need to be placed in a thermostatic chamber in which the temperature and humidity are constant, and after removing moisture from the filters, quantitative analysis must be performed, and the processing is complicated. In addition, the quantitative analysis has a problem that a microbalance that requires strict control of temperature and humidity and elimination of external vibration must be used.

  Therefore, the present invention provides a cascade impactor capable of performing quantitative analysis simultaneously with elemental analysis and ion species analysis even when the amount of collected particulate matter is a trace amount, and an analytical sample acquisition method using the cascade impactor The purpose is to do.

  In order to achieve the above object, the present invention captures the particulate matter by colliding the impactor having an inlet capable of inflowing a gas containing particulate matter and the gas introduced from the impactor. A cascade impactor having a collecting unit comprising: a collecting member to be collected; and a base plate that supports the collecting member and has an outlet through which the gas colliding with the collecting member can flow out, The collecting member is made of a glass material.

  As described above, according to the cascade impactor according to the present invention, even when elemental analysis is performed by configuring the collection member from a glass material, the ultrasonic wave is emitted and collected by the collection member. Samples for analysis can be obtained simply by dissolving the particulate matter in a solvent, and there is no need to perform complicated chemical treatments. Also in ionic species analysis, the particulate matter is completely isolated from the collection member. Therefore, quantitative analysis can be performed simultaneously with elemental analysis and ion species analysis.

  In the cascade impactor according to the present invention, the base plate is formed with a concave portion having a shape corresponding to the shape of the collecting member, and the collecting member is composed of a glass piece divided into two, and the glass piece It is preferable that a cutout portion cut out with respect to the shape of the concave portion is formed on one of the sides, and the collection member is configured in this manner, so that it is made of a glass material with less flexibility. Even the collecting member can be easily taken out from the base plate by pinching the notch with tweezers or the like.

  Further, the present invention radiates an ultrasonic wave in a state where the collection member in which the particulate matter is collected by the cascade impactor is immersed in a solvent, and detaches the particulate matter from the collection member to the solvent. An analytical sample acquisition method characterized by comprising a process. In the analytical sample acquisition method according to the present invention, when elemental analysis is performed, it is preferable to further include a step of emulsifying the particulate matter separated by the solvent. When performing ionic species analysis, it is separated by the solvent. It is preferable that the method further includes a step of filtering the particulate matter.

  As described above, according to the present invention, a cascade impactor capable of performing quantitative analysis at the same time as elemental analysis or ion species analysis even when a small amount of collected particulate matter is used, and an analysis using the cascade impactor A sample acquisition method can be provided.

    Next, an embodiment of a cascade impactor according to the present invention will be described with reference to the drawings. FIG. 1 is a partially cut front view of a cascade impactor according to the present embodiment, and FIG. 2 is a plan view thereof. The cascade impactor according to the present embodiment includes a case portion 10 that is mainly formed in a cylindrical shape, and first to third collection units 12 and 14 that are provided in the case member 10 at intervals in the vertical direction. 16.

  The case portion 10 is configured by stacking an upstream case member 18, three first to third intermediate case members 20, 22, 24, and a downstream case member 26 in order from above. That is, the case members 18, 20, 22, 24 and 26 are all formed in a cylindrical shape so that the sample gas passes through them, and the upstream case member 18 and the first to third intermediate cases. First inner steps 18a, 20a, 22a, 24a are formed near the middle of the inner peripheral surfaces of the members 20, 22, 24 so that the lower side has a large diameter. Second inner steps 18b, 20b, 22b, 24b are formed so that the lower side has a large diameter. In addition, grooves 18c, 20c, 22c, 24c that are recessed outward are formed over the entire circumferential direction on the inner peripheral surface below the second inner steps 18b, 20b, 22b, 24b. In the grooves 18c, 20c, 22c, and 24c, a rubber O-ring 28 is provided in a state of protruding inward. Further, outer steps 20d, 22d, 24d, and 26d having a small diameter on the upper side are formed near the upper periphery of the outer peripheral surfaces of the first to third intermediate case members 20, 22, and 24 and the downstream case member 26. On the upper surface, upper steps 20e, 22e, 24e, and 26e whose inner side is lowered are formed over the entire circumference. The upper steps 20e, 22e, 24e, and 26e are formed in a shape corresponding to the shapes of first to third base plates 34, 42, and 50 described later. The upper steps 20e, 22e, 24e, and 26e are formed with grooves 20f, 22f, 24f, and 26f that are recessed downward over the entire circumference. The grooves 20f, 22f, 24f, and 26f are formed with rubber. A made O-ring 29 is provided so as to protrude upward. The outer peripheral surfaces above the outer steps 20d, 22d, 24d, and 26d of the first to third intermediate case members 20, 22, and 24 and the downstream case member 26 are the upstream case member 18 and the first to third case members. The first intermediate step members 20, 22, 24 contact the inner peripheral surface below the first inner steps 18 a, 20 a, 22 a, 24 a, the first to third intermediate case members 20, 22, 24, and the downstream side The outer peripheral surfaces below the outer steps 20d, 22d, 24d, and 26d of the case member 26 are the upstream case member 18 and the second inner steps 18b, 20b of the first to third intermediate case members 20, 22, and 24, 22b, 24b abuts on the inner peripheral surface, and further, the first to third intermediate case members 20, 22, 24, and the outer step 20d, 22d, 24d, 26d of the downstream case member 26 By surface abuts the O-ring 28, the upstream-side casing member 18,3 one of the first to third intermediate case member 20, 22, 24 and the downstream side case member 26 is configured to be stacked in this order. A screw hole 26g is formed in the vicinity of the lower end of the inner peripheral surface of the downstream case member 26, and a tapered surface that tapers downward toward the screw hole 26g is formed. An air pump is connected to the screw hole 26g, and the sample gas can be passed through the case portion 10 by operating the air pump.

  As shown in FIGS. 3 to 5, the first collection unit 12 is formed in a disk shape, a first impactor 30 formed in a cylindrical shape with a top surface, a first glass plate 32 formed in a disk shape, A first base plate 34 that supports the first glass plate 32 and a fixing screw 36 that fixes the first glass plate 32 to the first base plate 34 are provided. A screw hole 30a through which a fixing screw 36 can be screwed passes through the center of the upper surface of the first impactor 30, and sample gas can flow in at equal intervals in the circumferential direction around the screw hole 30a. Six inflow holes 30b are formed. Further, a flange 30c is formed at the lower end of the outer peripheral surface of the first impactor 30 so as to protrude outward along the entire circumference. The outer peripheral edge of the flange 30c and the outer peripheral edge of the first base plate 34 are aligned. It is formed to do. Further, the first impactor 30 is configured so that the outer peripheral surface thereof is in close contact with the inner peripheral surface of the upstream case member 18 when inserted into the upstream case member 18. A circular recess 34a corresponding to the shape of the first glass plate 32 is formed at the center of the first base plate 34. The first glass plate 32 is placed in the recess 34a, and the fixing screw 36 is moved downward. The first glass plate 32 can be fixed to the first base plate 34 by screwing and holding the first glass plate 32 at its tip. In addition, four outflow holes 34b through which the sample gas can flow out are formed at equal intervals in the circumferential direction on the outside of the recess 34a of the first pace plate 34. The six inflow holes 30b are formed in a circular shape so as to be positioned above the first glass plate 32, and the four outflow holes 34b are formed in a shape along the outer periphery of the first glass plate 32. ing. As shown in FIG. 6, the first glass plate 32 is divided into two at the center, and a notch 32 a is formed on one side so that it can be easily removed with tweezers or the like.

  As shown in FIGS. 7 to 10, the second collection unit 14 and the third collection unit 16 are similar to the first collection unit 12 in the second impactor 38, the second glass plate 40, the second base plate 42, and the fixed unit. The screw 44, the third impactor 46, the third glass plate 48, the third base plate 50, and the fixing screw 52 are provided, and the same as the first collecting unit 12 except for the second impactor 38 and the third impactor 46. It has a configuration. The inflow hole 38 b of the second impactor 38 has a smaller diameter than the inflow hole 30 b of the first impactor 30, and the inflow hole 46 b of the third impactor 46 has a smaller diameter than the inflow hole 38 b of the second impactor 38. The second impactor 38 is lower in height than the first impactor 30 so that the distance from the inflow hole 38b to the second glass plate 40 is shorter than the first impactor 30, and the third impactor 46 is the same. Further, the height is lower than that of the second impactor 38.

  These first to third collection units 12, 14, 16 are respectively provided between the upstream case member 18 and the first intermediate case member 20, between the first intermediate case member 20 and the second intermediate case member 22, and the second. By being sandwiched between the intermediate case member 22 and the third intermediate case member 24, the case portion 10 is configured to be mounted. That is, the first impactor 30 of the first collection unit 12 is inserted in a state where the outer peripheral surface is in close contact with the inner peripheral surface of the upstream case member 18, and the flange 30c contacts the first inner step 18a. On the other hand, the first base member 34 is placed in the upper step 20 e of the first intermediate case member 20. The second and third collection units 14 and 16 are sandwiched in the same manner as the first collection unit 12.

  In the cascade impactor according to the present embodiment, the filter unit 52 is sandwiched between the third intermediate case member 24 and the downstream case member 26 in the same manner as the first collection unit 12. The filter unit 52 is formed in a ring shape corresponding to the shape of the upper step 26e of the downstream case member 26, and includes a nitrocellulose membrane filter 54 having a pore diameter of 0.8 microns and a polycarbonate membrane filter having a pore diameter of 0.8 microns. 56 is held in a state of being laminated.

  The stacked case portions 10 are fixed by being sandwiched from above and below by a pair of fixing members 58 and 58. The fixing member 58 has a configuration in which a hook 58a screwed to the upstream case member 18 and a fixing piece 58b screwed to the bottom surface of the downstream case member 26 are coupled by a toggle mechanism 58c. When the case portion 10 stacked by the pair of fixing members 58 and 58 is fixed, the case members 18, 20, 22, 24 and 26 are contracted in the vertical direction against the elastic force of the O-rings 28 and 29. It is configured to be fixed in a state.

  The cascade impactor assembled in this manner allows a sample gas to pass through the case portion 10 by connecting an air pump (not shown) to the screw hole 26g of the downstream case member 26, and captures particulate matter contained in the sample gas. You can gather. That is, when the sample gas is caused to flow into the cascade impactor, first, it flows into the first collection unit 12 from the inflow hole 30b of the first impactor 30 and is caused to collide with the first glass plate 32. The sample gas that has collided with the first glass plate 32 collects particulate matter of a certain particle size or more in the first glass plate 32 and contains the remaining particulate matter in the outflow hole of the first base plate 34. 34b. The sample gas that has flowed out of the outflow hole 34 b flows into the second collection unit 14 from the inflow hole 38 b of the second impactor 38 and is collided with the second glass plate 40. The sample gas that has collided with the second glass plate 40 collects particulate matter of a certain particle size or more in the second glass plate 40 and contains the remaining particulate matter in the outflow hole of the second base plate 42. It flows out of 42b. The sample gas that has flowed out of the outflow hole 42 b flows into the third collection unit 16 from the inflow hole 46 b of the third impactor 46 and is collided with the third glass plate 48. The sample gas that has collided with the third glass plate 48 collects particulate matter of a certain particle size or more in the third glass plate 48 and contains the remaining particulate matter in the outflow hole of the third base plate 50. It flows out from 50b. The sample gas that has flowed out of the outflow hole 50 b passes through the filter unit 52, so that particulate matter having a certain particle diameter or more is collected and flows out from the screw hole 26.

Next, the process of collecting the particulate matter in the sample gas using the cascade impactor according to the present embodiment will be described based on the flowchart shown in FIG. First, (a) the first to third glass plates 32, 40, 48 are washed with ultra pure only and then dried, (b) stored in a desiccator containing silica gel to remove water, and a nitrocellulose-based membrane Similarly, the filter 54 and the polycarbonate membrane filter 56 are stored in a desiccator to remove moisture, and are bonded together to form a filter unit 52. (C) The first to third glass plates 32, 40, 48 and the filter unit 52 are weighed to obtain a weight W _s before collection. (D) Each sample is placed on a cascade impactor and is sampled using an air pump. by inhalation of gaseous particulate matter adsorbs and collects each first to third glass plate 32,40,48 and filter unit 52, to measure the (e) in addition, the weight W _e after each collection.

Next, an analysis sample acquisition step used for elemental analysis using an ICP mass spectrometer or ICP emission spectrometer will be described based on the flowchart shown in FIG. First, (f) each of the first to third glass plates 32, 40, 48 and the filter unit 52 on which the particulate matter is collected is put into a 15-ml polypropylene conical tube having a sharp inner volume, and 1% concentration is added thereto. Add 5 ml or 10 ml of high purity nitric acid (HNO ₃ ), and (g) store this conical tube in a stainless steel test tube rack and place it in an ultrasonic cleaning device filled with specified water for ultrasonic cleaning. By carrying out for 5 to 10 minutes, the particulate matter collected from the first to third glass plates 32, 40, and 48 and the filter unit 52 is desorbed. At this time, it can be visually confirmed that the particulate matter is completely detached. Next, (h) by adding 100 μm of a 1% solution of X-100 (ICN Pharmaceuticals Inc., USA) to 10 ml of nitric acid solution and emulsifying the nitric acid solution containing the detached particulate matter. It is possible to obtain an analytical sample used for elemental analysis using an ICP mass spectrometer or an ICP emission spectrometer.

  Next, an analysis sample acquisition step used for performing ion species analysis using the IC analyzer will be described based on the flowchart shown in FIG. First, (f ′) the first to third glass plates 32, 40, 48 and the filter unit 52 on which the particulate matter is collected are put into a 15-ml polypropylene conical tube having a sharp inner volume, and ultrapure. Add 5 ml or 10 ml of water, and (g ′) place this conical tube in a stainless steel test tube rack and place it in an ultrasonic cleaning device filled with the specified water and perform ultrasonic cleaning for 5 to 10 minutes. Thus, the particulate matter collected from the first to third glass plates 32, 40, 48 and the filter unit 52 is desorbed. At this time, it can be visually confirmed that the particulate matter is completely detached. Next, (h ′) ultrapure water containing the desorbed particulate matter is filtered through a 0.45 μm disposable cellulose acetate membrane filter to perform ionic species analysis using an IC analyzer. It is possible to obtain an analytical sample used for the above.

  Next, using the National Institute of Standard Reference Material R 2783 (Air Particle on Filter Media) containing a standard substance as a sample, Li, B, Na, Mg, Al, Si, P, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Rb, Sr, Zr, Mo, Ag, Cd, Sn, Sb, Cs, Ba, W, Elemental analysis was performed on 35 elements of Pb and U using an IPC mass spectrometer. Table 1 shows the test results.

試料からは、測定を行った３５元素がすべて定量され、標準物質の保証値として提示されている２２元素のうち、Ａｌ、Ｓｉ、Ｋ、Ｔｉを除く１８元素が、保証値に対して６６〜１１０％の検出率となった。以上のことから、上記工程で得られた分析用試料は、ＩＣＰ質量分析装置によって、元素分析と同時に定量分析を行なうことができることを確認できた。

From the sample, all 35 elements measured were quantified, and among the 22 elements presented as guaranteed values of the standard substance, 18 elements excluding Al, Si, K, Ti were 66 to The detection rate was 110%. From the above, it was confirmed that the analytical sample obtained in the above step could be subjected to quantitative analysis simultaneously with elemental analysis using an ICP mass spectrometer.

  In addition, a blank test using an ICP mass spectrometer was similarly performed on the first to third glass plates 32, 40, and 48 and the filter unit 52. As a result, in the first to third glass plates 32, 40, 48, B, Na, Al, Si, P, K, Ca, Ti, Cr, Fe, Cu, Zn, Ga, Rb, Zr, Mo, The 21 elements of Sn, Sb, Ba, W, and Pb were quantified in minute amounts, and the error of the measured value by 5 times of quantitative analysis of each element was 1% or less. From this, it can be confirmed that the blank measurement values of the first to third glass plates 32, 40, and 48 are very stable and can improve the reliability of the elemental analysis of the collected particulate matter. It was. On the other hand, in the filter unit 52, five elements of Si, Cr, Fe, Cu, and P were quantified, and the error of the measurement value of 5 times was 10% or less for any element.

  Next, air was used as a sample gas to collect particulate matter for 24 hours at a flow rate of 20 L / min using the cascade impactor according to this example. As in Example 1, the IPC mass spectrometer was used for 35 elements. Elemental analysis was performed using this. The results are shown in Table 2.

Next, air is used as a sample gas to collect particulate matter for 24 hours at a flow rate of 20 L / min using the cascade impactor according to the present embodiment, and F ions, Cl ions, NO ₂ ions, Br ions as anions. , NO ₃ ions, PO ₄ ions, SO ₄ ions, and cations, Na ions, NH ₄ ions, K ions, Mg ions, and Ca ions are subjected to ion species analysis using an IC analyzer. It was. The test results are shown in Table 3.

表３に示すように試料気体からは上記１２種のイオンがすべて定量された。また、第１乃至第３ガラスプレート３２、４０、４８及びフィルタユニット５２について、ＩＣ分析装置を用いたブランク試験を同様に行なった。その結果、第１乃至第３ガラスプレート３２、４０、４８においては、Ｃｌイオン、ＮＯ_２イオン、ＮＯ_３イオン、ＳＯ_４イオン、Ｎａイオン、ＮＨ_４イオン、Ｋイオンが０．００２〜０．０２５ｍｇ／Ｌの範囲で定量され、５回の測定誤差はどのイオンについても５％以下となった。このことから、第１乃至第３ガラスプレート３２、４０、４８のブランク測定値は、非常に安定しており、捕集された粒子状物質のイオン種分析の信頼性を高めることができることを確認できた。これに対してフィルタユニット５２においては、Ｆイオン、Ｃｌイオン、ＮＯ_２イオン、ＮＯ_３イオン、ＳＯ_４イオン、Ｎａイオン、Ｋイオンが定量され、５回の測定誤差はどの元素についても１０％以下となった。

As shown in Table 3, all the 12 ions were quantified from the sample gas. A blank test using an IC analyzer was similarly performed on the first to third glass plates 32, 40, and 48 and the filter unit 52. As a result, in the first to third glass plate 32,40,48, Cl ion, NO ₂ ion, NO ₃ ion, SO ₄ ion, Na ion, NH ₄ ion and K ion 0.002~0.025mg Quantified in the range of / L, the measurement error of 5 times was 5% or less for any ion. From this, it is confirmed that the blank measurement values of the first to third glass plates 32, 40, and 48 are very stable and can improve the reliability of the ionic species analysis of the collected particulate matter. did it. On the other hand, in the filter unit 52, F ions, Cl ions, NO ₂ ions, NO ₃ ions, SO ₄ ions, Na ions, K ions are quantified, and the measurement error of 5 times is 10% or less for any element. It became.

It is a partially cut front view of the Example which concerns on the cascade impactor of this invention. It is a top view of the cascade impactor which concerns on a present Example. It is a top view of the 1st collection unit of the cascade impactor which concerns on a present Example. It is a top view of the baseplate provided with the glass plate of the 1st collection unit of the cascade impactor which concerns on a present Example. It is sectional drawing of the 1st collection unit of the cascade impactor which concerns on a present Example. It is the perspective view and top view of a glass plate of the cascade impactor which concern on a present Example. It is a top view of the 2nd collection unit of the cascade impactor which concerns on a present Example. It is sectional drawing of the 2nd collection unit of the cascade impactor which concerns on a present Example. It is a top view of the 3rd collection unit of the cascade impactor which concerns on a present Example. It is sectional drawing of the 3rd collection unit of the cascade impactor which concerns on a present Example. It is a flowchart which shows the collection process of the cascade impactor which concerns on a present Example. It is a flowchart which shows the elemental analysis process of the particulate matter collected by the cascade impactor which concerns on a present Example. It is a flowchart which shows the ion species analysis process of the particulate matter collected by the cascade impactor which concerns on a present Example. It is a partially cut front view which shows the conventional cascade impactor.

Explanation of symbols

12 1st collection unit 14 2nd collection unit 16 3rd collection unit 30 1st impactor 32 1st glass plate 34 1st base plate 38 2nd impactor 40 2nd glass plate 42 2nd base plate 46 3rd impactor 48 1st 3 Glass plate 50 3rd base plate

Claims (3)

An impactor having an inflow port through which a gas containing particulate matter can flow downward; a collecting member for collecting the particulate matter by colliding the gas introduced from the impactor; and the collecting member A cascade impactor having a collection unit, and a base plate having an outlet through which the gas colliding with the collection member can flow out.
The cascade impactor, wherein the collecting member is made of a glass material. The base plate is formed with a concave portion corresponding to the shape of the collecting member,
The said collection member consists of a glass piece divided | segmented into two, The notch part notched with respect to the shape of the said recessed part is formed in one side of a glass piece, It is characterized by the above-mentioned. The cascade impactor according to 1. An ultrasonic wave is emitted in a state where the collection member in which the particulate matter is collected by the cascade impactor according to claim 1 is immersed in a solvent, and the particulate matter is transferred from the collection member to the solvent. A method for obtaining a sample for analysis, comprising a step of detaching.

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