JP6066405B2 - Quantitative measurement system for oil-contaminated soil - Google Patents
Quantitative measurement system for oil-contaminated soil Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims description 42
- 238000005259 measurement Methods 0.000 title claims description 36
- 238000009423 ventilation Methods 0.000 claims description 34
- 238000004891 communication Methods 0.000 claims description 19
- 239000003570 air Substances 0.000 description 33
- 238000001514 detection method Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000003921 oil Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000000691 measurement method Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000008786 sensory perception of smell Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
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Description
本発明は、油汚染土壌用定量測定システム、特に被測定ガス循環式の油汚染土壌用定量測定システムに関する。 The present invention relates to a quantitative measurement system for oil-contaminated soil, and more particularly to a gas measurement type circulation measurement system for oil-contaminated soil.
油汚染土壌と非油汚染土壌とが混在する土地において土壌を場外へ搬出する場合、非油汚染土壌は一般残土として搬出され、油汚染土壌は処理施設へ搬出されることになる。油汚染土壌か否かを現地で評価する場合、油臭と油膜とによる確認がなされる場合が多いが、油臭を簡易的に測定方法には次の2つの方法がある。 In the case where the soil is carried out of the land where the oil-contaminated soil and the non-oil-contaminated soil are mixed, the non-oil-contaminated soil is carried out as general residual soil, and the oil-contaminated soil is carried out to the treatment facility. When evaluating whether or not it is oil-contaminated soil, there are many cases where confirmation is made with an oily odor and an oil film, but there are the following two methods for measuring oily odor simply.
[人の臭覚で測定する方法]
環境省の「油汚染対策ガイドライン」(非特許文献1)に記載される油臭の測定方法は以下の通りである。
第1に、土壌50gを500ml容積のガラス瓶に入れ、蓋をして約25℃で30分間放置する。
第2に、蓋を外して直ちに土壌から発生するにおいを嗅ぎ、臭気の有無及び油種とその程度を試験する。
[Method of measuring by human sense of smell]
The method for measuring oily odor described in “Oil Pollution Countermeasure Guidelines” (Non-Patent Document 1) of the Ministry of the Environment is as follows.
First, 50 g of soil is placed in a 500 ml glass bottle, covered and left at about 25 ° C. for 30 minutes.
Secondly, remove the lid, immediately smell the odor generated from the soil, and test for the presence of odor, oil type and its degree.
[臭気センサーを用いる方法]
臭気センサーは、測定対象のガスを吸引して臭いを測定し、数値化するものである。例えば臭い測定装置として、検出電極の周囲に臭気成分感応部を付設してなる検知素子を有し、この検知装置を、吸引口から排出口へ連通する被検知ガスの流路中に暴露し、臭い成分の量に応じた検知素子の抵抗値の変化によって臭いの程度を測定するものが知られている(特許文献1、特許文献2)。
[Method using odor sensor]
The odor sensor measures the odor by sucking the gas to be measured and digitizes it. For example, as an odor measuring device, it has a detection element in which an odor component sensitive part is attached around the detection electrode, and this detection device is exposed to the flow path of the gas to be detected communicating from the suction port to the discharge port. There are known devices that measure the degree of odor by changing the resistance value of the sensing element in accordance with the amount of the odor component (Patent Document 1, Patent Document 2).
上述の「油汚染対策ガイドライン」に従って作成した測定用ガスを臭気センサーによって測定する場合は、ガラス瓶の蓋を外して臭気センサーの吸引口を瓶口に近づけて測定する必要がある(図7参照)。
これと類似の技術として、密閉型の試料容器の周壁の一部から突出する通気管の先端部にバキューム装置を、また通気管の途中に臭気センサーを付設した現場調査用臭い測定システムも知られている(特許文献3)。
When measuring the measurement gas created according to the above “Oil Pollution Countermeasure Guidelines” with an odor sensor, it is necessary to remove the glass bottle lid and measure the odor sensor with the suction port close to the bottle mouth (see FIG. 7). .
As a similar technology, there is also known an on-site odor measurement system in which a vacuum device is attached to the tip of a vent tube protruding from a part of the peripheral wall of a sealed sample container, and an odor sensor is installed in the middle of the vent tube. (Patent Document 3).
特許文献1の方法は、調査実施者による官能試験であり、測定結果に個人差がある。
特許文献2の方法は、「油汚染対策ガイドライン」により得られる測定用ガスのガス量で低い臭気レベルの評価をする場合に、周辺の外気が混合する可能性があり、測定誤差を生じやすい。特許文献3のシステムでも、バキューム装置により試料容器内の空気を強制的に吸い出すので、臭気センサーの測定に時間を要する場合に、測定する行為自体により試料容器内の臭気成分の濃度が変化してしまう。
The method of Patent Document 1 is a sensory test by a researcher, and there are individual differences in measurement results.
The method of Patent Document 2 is likely to cause a measurement error because surrounding ambient air may be mixed when evaluating a low odor level with the amount of measurement gas obtained according to the “Guidelines for Countermeasures against Oil Contamination”. Even in the system of Patent Document 3, since the air in the sample container is forcibly sucked out by the vacuum device, when the measurement of the odor sensor takes time, the concentration of the odor component in the sample container is changed by the measuring action itself. End up.
その結果として、土壌の運搬業者が非油汚染土壌と判断して、非油汚染土壌の受け入れ業者まで運搬してきたところ、その土壌の受け入れ業者が当該土壌を油汚染土壌と判定することがある。そうなると、運搬業者は、当該土壌を元の場所に持ち帰らなければならないなどという非効率的なことがおこり得る。 As a result, when the soil transporter determines that the soil is non-oil-contaminated soil and transports it to a receiver who receives non-oil-contaminated soil, the soil receiver may determine that the soil is oil-contaminated soil. Then, the carrier can be inefficient, such as having to take the soil back to its original location.
本発明の第1の目的は、油臭を臭気センサーにより定量的に測定する場合の精度を向上させることである。
本発明の第2の目的は、測定精度の向上のために、測定容器内の被測定用ガスを、外気の混入を遮断した臭気センサーに吸入しかつこの臭気センサーから排出して循環させる油汚染土壌用定量測定システムを提案することである。
The first object of the present invention is to improve the accuracy when the oily odor is quantitatively measured by an odor sensor.
The second object of the present invention is oil contamination in which the gas to be measured in the measurement container is sucked into and discharged from the odor sensor in which mixing of outside air is blocked in order to improve measurement accuracy. It is to propose a quantitative measurement system for soil.
第1の手段は、
送気用の第1通気口及び還気用の第2通気口を有し、これら両通気口を除いて密閉した試料容器と、
吸気口及び排気口を有し、吸気口から臭気成分を含む空気を取り込み、臭気の強度を測定した後に排気口より排気するように構成した臭気センサーと、
試料容器の第1通気口を臭気センサーの吸気口へ、かつ、臭気センサーの排気口を試料容器の第2通気口へそれぞれ接続した連通管と、
を具備し、
これら連通管と試料容器及び臭気センサーの各内部とを通る循環式の空気循環路を構成し、
上記試料容器は、容器本体の口部に着脱自在に装着した蓋部を有するとともに、これら蓋部に一対の通気孔を開口しており、
上記第1通気口は、上記一対の通気孔の一方に、当該一方通気孔から容器本体の上半部内まで延びる第1通気パイプを挿入してなり、
上記第2通気口は、上記一対の通気孔の他方に、当該他方通気孔から容器本体の底部付近へ延びる第2通気パイプを挿入してなる。
The first means is
A sample container which has a first ventilation port for air supply and a second ventilation port for return air, and is sealed except for these ventilation ports;
An odor sensor having an intake port and an exhaust port, configured to take in air containing an odor component from the intake port, measure the odor intensity, and then exhaust from the exhaust port;
A communication pipe connecting the first vent of the sample container to the inlet of the odor sensor and the exhaust port of the odor sensor to the second vent of the sample container;
Comprising
A circulation type air circulation path that passes through these communication pipes and each inside of the sample container and the odor sensor is constructed .
The sample container has a lid part that is detachably attached to the mouth part of the container body, and has a pair of vent holes in the lid part.
The first vent is formed by inserting, into one of the pair of vents, a first vent pipe extending from the one vent into the upper half of the container body,
The second vent hole is formed by inserting a second vent pipe extending from the other vent hole to the vicinity of the bottom of the container body on the other of the pair of vent holes.
本手段では、図1に示す如く試料容器2から臭気センサー14に至り、再び試料容器2に戻る空気循環路Cを形成することを提案している。これにより試料容器2に外気が混入することを防止できる。 In this means, it is proposed to form an air circulation path C from the sample container 2 to the odor sensor 14 and back to the sample container 2 as shown in FIG. Thereby, it can prevent that external air mixes in the sample container 2. FIG.
また本手段では、図2に示すように、送気用の第1通気口8の第1通気パイプ8bを容器本体4の上半部内まで垂下するとともに、還気用の第2通気口9の容器本体4の底部4a近くまで垂下している。これにより、容器本体4の上半部内の臭気成分の濃度が均一化した空気を臭気センサーに送ることができる。 Further, in this means, as shown in FIG. 2, the first ventilation pipe 8b of the first ventilation port 8 for air supply hangs down into the upper half of the container body 4, and the second ventilation port 9 for return air The container body 4 hangs down near the bottom 4a. Thereby, the air with which the density | concentration of the odor component in the upper half part of the container main body 4 was equalized can be sent to an odor sensor.
第2の手段は、第1の手段を有し、かつ
さらに上記試料容器の温度を一定に保つための定温保持手段を具備している。
The second means includes a first means, and further comprises a constant temperature retention means for maintaining the temperature of the sample container constant.
本手段では、図4に示すように試料容器の温度を定温に保つ定温保持手段32を設けることを提案している。これにより臭気成分の測定を一定温度で測定でき、測定の信頼度が向上する。 In this means, it is proposed to provide a constant temperature holding means 32 for keeping the temperature of the sample container constant as shown in FIG. As a result, the odor component can be measured at a constant temperature, and the reliability of the measurement is improved.
第1の手段に係る発明によれば、試料容器と連通管と臭気センサーとを通過する循環式の空気循環路を形成したから、測定の途中で外気の混入などにより臭い成分が薄まることがない。
また第1の手段に係る発明によれば、送気用の第1通気口の第1通気パイプは容器本体の上半部内まで延び、還気用の第2通気口の第2通気パイプは容器本体の底部付近へ延びるから、第1通気口の開口位置による臭気の測定量のばらつきを小さくすることができる。
第2の手段に係る発明によれば、上記試料容器の温度を一定に保つための定温保持手段を具備するから、現場の気温に左右されずに一定の温度条件で測定ができる。
According to the first aspect of the invention, since the circulation type air circulation path that passes through the sample container, the communication pipe, and the odor sensor is formed, the odor component does not fade due to the mixing of outside air during the measurement. .
According to the invention according to the first aspect, the first ventilation pipe of a first vent for air extends to half portion on the container body, a second vent pipe of the second vent for return air chamber Since it extends to the vicinity of the bottom of the main body, it is possible to reduce variation in the amount of odor measurement due to the opening position of the first vent.
According to the invention relating to the second means, since the constant temperature holding means for keeping the temperature of the sample container constant is provided, the measurement can be performed under a constant temperature condition without being influenced by the on-site temperature.
図1から図4は、本発明の第1の実施形態に係る油汚染土壌用定量測定システム1を示している。 1 to 4 show a quantitative measurement system 1 for oil-contaminated soil according to a first embodiment of the present invention.
油汚染土壌用定量測定システム1は、試料容器2と、第1連通管12A及び第2連通管12Bと、臭気センサー14とで構成されている。 The oil-contaminated soil quantitative measurement system 1 includes a sample container 2, a first communication pipe 12A and a second communication pipe 12B, and an odor sensor 14.
試料容器2は、容器本体4と、蓋部6とで構成されている。 The sample container 2 includes a container main body 4 and a lid portion 6.
上記容器本体4は、底部4aと胴部4bと口頸部4cとを有する。底部4aは土壌サンプルSを均(なら)すことができるようにある程度の広さがある平坦な壁部とするとよい。 The said container main body 4 has the bottom part 4a, the trunk | drum 4b, and the mouth neck part 4c. The bottom 4a may be a flat wall having a certain size so that the soil sample S can be leveled.
上記蓋部6は、上記口頸部4cに気密に嵌合させた蓋周壁6aと、この蓋周壁6aの上端部に付設した蓋板6bとを有する。 The lid portion 6 includes a lid peripheral wall 6a that is airtightly fitted to the mouth / neck portion 4c, and a lid plate 6b that is attached to the upper end portion of the lid peripheral wall 6a.
上記蓋板6bには、送気用の第1通気口8及び還気用の第2通気口9を開口している。 The lid plate 6b is provided with a first ventilation port 8 for air supply and a second ventilation port 9 for return air.
図示の第1通気口8は、第1通気孔8aに第1通気パイプ8bを気密に篏合させている。この第1通気パイプ8bは、上端部を蓋板6b上方に残して容器本体4の上半部内まで垂下している。 The illustrated first vent 8 has the first vent pipe 8b airtightly engaged with the first vent hole 8a. The first ventilation pipe 8b hangs down into the upper half of the container body 4 while leaving the upper end portion above the cover plate 6b.
図示の第2通気口9は、第2通気孔9aに第2通気パイプ9bを気密に篏合させている。この第2通気パイプ9bは、上端部を蓋板6b上方に残して容器本体4の底部4a近くまで垂下している。 The illustrated second ventilation hole 9 has the second ventilation pipe 9b airtightly engaged with the second ventilation hole 9a. The second ventilation pipe 9b hangs down to the vicinity of the bottom 4a of the container body 4 with the upper end portion left above the lid plate 6b.
第1連通管12Aは、第1通気パイプ8bの上端部に、また第2連通管12Bは、第2通気パイプ9bの上端部に、それぞれ気密に連結している。 The first communication pipe 12A is airtightly connected to the upper end of the first ventilation pipe 8b, and the second communication pipe 12B is airtightly connected to the upper end of the second ventilation pipe 9b.
臭気センサー14は、外部へ開口する吸気口16及び排気口18と、吸気口16から排気口18へ至る空気通路20と、センサー本体22と、測定結果表示手段28と、吸引排気手段30とを具備する。 The odor sensor 14 includes an intake port 16 and an exhaust port 18 that are open to the outside, an air passage 20 extending from the intake port 16 to the exhaust port 18, a sensor body 22, a measurement result display unit 28, and a suction / exhaust unit 30. It has.
上記吸気口16には上記第1連通管12Aが、また排気口18には第2連通管12Bがそれぞれ気密に連結されている。それら吸気口16及び排気口18は空気通路20で連通している。容器本体4と第1連通管12Aと空気通路20と第2連通管12Bとで空気循環路Cを形成している。 The first communication pipe 12A is connected to the intake port 16 and the second communication pipe 12B is connected to the exhaust port 18 in an airtight manner. The intake port 16 and the exhaust port 18 communicate with each other through an air passage 20. The container body 4, the first communication pipe 12A, the air passage 20, and the second communication pipe 12B form an air circulation path C.
上記センサー本体22は、上記空気通路20内に露出した臭気検知素子24を有する。この臭気検知素子24は、検出電極24aの一部の周囲に略球状の臭気成分感応部24bを付設してなる。図示例では、この臭気検知素子24と、当該臭気検知素子の抵抗値を測定するための電気回路26とでセンサー本体22を構成している。 The sensor body 22 has an odor detecting element 24 exposed in the air passage 20. The odor detection element 24 is formed by attaching a substantially spherical odor component sensitive portion 24b around a part of the detection electrode 24a. In the illustrated example, the sensor main body 22 is composed of the odor detecting element 24 and an electric circuit 26 for measuring the resistance value of the odor detecting element.
このセンサー本体22は、空気通路を通過する臭い成分の一部が臭気検知素子24に付着して抵抗値が変化するように形成し、この抵抗値を電気回路で電気信号に変換して、測定結果表示手段28に対して出力するように構成している。 The sensor body 22 is formed so that a part of the odor component passing through the air passage adheres to the odor detection element 24 and changes its resistance value, and the resistance value is converted into an electric signal by an electric circuit to measure. An output is made to the result display means 28.
測定結果表示手段28は、センサー本体22からの出力に応じて臭気のレベルの測定結果を表示する。表示の仕方は、少なくとも法律などで定められた臭気レベルに測定値が達しているか否かを表示できるものであれば足りる。 The measurement result display means 28 displays the measurement result of the odor level according to the output from the sensor body 22. Any display method is acceptable as long as it can display whether or not the measured value has reached the odor level determined by law or the like.
本明細書において、「定量測定」という用語は、ある土壌を、臭気レベルを用いて、油汚染土壌ないし非油汚染土壌の臭気の程度を測定できるという意味である。臭気の有る又は無しの二択を判定するような測定方法も本発明の範囲から除外されない。 In this specification, the term “quantitative measurement” means that a certain soil can be measured for the degree of odor of oil-contaminated soil or non-oil-contaminated soil using the odor level. Measurement methods that determine the choice of whether or not there is an odor are not excluded from the scope of the present invention.
上記吸引排気手段30は、センサー本体22の吸気口16から空気を吸込み、排気口18より送り戻す機能を有している。吸引排気手段30の位置は適宜変更することができる。 The suction exhaust means 30 has a function of sucking air from the intake port 16 of the sensor body 22 and sending it back from the exhaust port 18. The position of the suction / exhaust means 30 can be changed as appropriate.
上記構成において、試料容器2に土壌サンプルSを入れるときには、図1に示すように容器本体4の底部4a付近に適量入れ、均等に分散させる。土壌サンプルSからは臭い成分が揮発し、容器本体4全体に拡散する。容器本体4の底部付近では、場所により臭い成分の濃度にばらつきがある可能性があるが、容器本体4の上半部で臭い成分が均等化している。 In the above configuration, when the soil sample S is put into the sample container 2, an appropriate amount is put in the vicinity of the bottom 4a of the container body 4 as shown in FIG. The odorous component volatilizes from the soil sample S and diffuses throughout the container body 4. Near the bottom of the container body 4, the concentration of the odorous component may vary depending on the location, but the odorous component is equalized in the upper half of the container body 4.
図1の状態から吸引排気手段30を作動させると、容器本体4の上半部内の空気が第1通気パイプ8b、第1連通管12Aを経由して、吸気口16より空気通路20内へ入り、また排気口18より、第2連通管12B、第2通気パイプ9bを経て容器本体4の下半部へ戻る。空気通路20内では、空気に含まれる臭気成分の一部が臭気検知素子24に接して、これにより前述の通り臭気濃度が検出される。臭気成分の残りの部分は空気とともに容器本体4の上半部へ戻される。臭気センサー14の出力が安定するまである程度の時間が必要であるが、臭気成分の残りの部分が容器本体4に戻るので、空気循環路C内の臭気成分の量は殆ど変化しない。従って臭気濃度を正確に測定することができる。 When the suction / exhaust means 30 is operated from the state of FIG. 1, the air in the upper half of the container body 4 enters the air passage 20 from the intake port 16 via the first ventilation pipe 8b and the first communication pipe 12A. Further, the exhaust port 18 returns to the lower half of the container body 4 through the second communication pipe 12B and the second ventilation pipe 9b. In the air passage 20, part of the odor component contained in the air contacts the odor detection element 24, thereby detecting the odor concentration as described above. The remaining portion of the odor component is returned to the upper half of the container body 4 together with air. A certain amount of time is required until the output of the odor sensor 14 is stabilized. However, since the remaining portion of the odor component returns to the container body 4, the amount of the odor component in the air circulation path C hardly changes. Therefore, the odor concentration can be accurately measured.
図4は、本発明の第2の実施形態に係る油汚染土壌用定量測定システムを示している。この実施形態のうち第1実施形態と同じ事項は説明を省略する。本実施形態のシステムは、試料容器の温度を一定に保つための定温保持手段32として水槽(ウォーターバス)を具備している。土壌から生ずる油臭の強さは臭い成分の揮発速度に左右され、そして揮発速度は周囲の温度に左右されるからである。図示の水槽は上面開口のタンクである。ここに一定温度の水Wを入れ、水の中に試料容器2をセットして測定を行うものである。 FIG. 4 shows a quantitative measurement system for oil-contaminated soil according to the second embodiment of the present invention. In this embodiment, the same matters as in the first embodiment will not be described. The system of this embodiment includes a water bath (water bath) as the constant temperature holding means 32 for keeping the temperature of the sample container constant. This is because the intensity of the oily odor generated from the soil depends on the volatilization rate of the odor component, and the volatilization rate depends on the ambient temperature. The illustrated water tank is a tank having an upper surface opening. The water W at a constant temperature is put here, and the sample container 2 is set in the water for measurement.
本実施形態において、第1通気パイプ8bは第1通気孔8aに、また第2通気パイプ9bは第2通気孔9aにそれぞれ気密かつ水密に嵌合させるものとし、蓋部6も試料容器2の口頸部に対して水密に取り付け可能とする。 In the present embodiment, the first ventilation pipe 8b is fitted into the first ventilation hole 8a, and the second ventilation pipe 9b is fitted into the second ventilation hole 9a in an airtight and watertight manner. It can be attached to the mouth and neck in a watertight manner.
[実施例]
以下に本発明の性能試験のために出願人が行った実験例を解説する。
(1)測定対象の土壌試料を採取して、500mlの試料容器2にサンプル土壌50gを入れる。
(2)薬サジにて試料容器2内のサンプル土壌を軽く敷きならす。
(3)試料容器2に蓋部6を取り付けるとともに、外気が混入しないように第1通気パイプ8b及び第2通気パイプ9bの先部をクリップなどの閉鎖具Dで封鎖する。
(4)この封鎖により密閉された試料容器2を、水温25℃のウォーターバス内に入れて、30分間静置する。
(5)30分の静置した後に、第1通気パイプ8bを、第1連通管12Aを介して臭気センサーの吸気口16に、また第2通気パイプ9bを、第2連通管12Bを介して臭気センサー14の排気口18にそれぞれ接続し、上記封鎖を解除する。
(6)臭気センサー14の吸引排気手段30を作動させて、試料容器内のサンプルガスを臭気センサー14へ400ml/minの吸引速度で吸引し、臭気レベルを測定する。
[Example]
The following describes experimental examples conducted by the applicant for the performance test of the present invention.
(1) A soil sample to be measured is collected, and 50 g of sample soil is placed in a 500 ml sample container 2.
(2) Lightly spread the sample soil in the sample container 2 with a medicine sword.
(3) The lid portion 6 is attached to the sample container 2 and the tip portions of the first ventilation pipe 8b and the second ventilation pipe 9b are sealed with a closing tool D such as a clip so that outside air is not mixed.
(4) The sample container 2 sealed by this blockage is placed in a water bath having a water temperature of 25 ° C. and left to stand for 30 minutes.
(5) After standing for 30 minutes, the first ventilation pipe 8b is connected to the intake port 16 of the odor sensor via the first communication pipe 12A, and the second ventilation pipe 9b is connected via the second communication pipe 12B. Each is connected to the exhaust port 18 of the odor sensor 14 to release the blockage.
(6) The suction / exhaust means 30 of the odor sensor 14 is operated, the sample gas in the sample container is sucked into the odor sensor 14 at a suction speed of 400 ml / min, and the odor level is measured.
現場で実際に油汚染土壌か否かを判定するときには、臭気レベルが一定の閾値を超えるかどうかで判断すればよい。しかしながら、この実施例では本発明のシステムの性能試験のために臭気レベルを経時的に測定した。その結果を図6(A)に示す。また対比例として図7の従来の測定方法で臭気レベルを経時的に測定し、その結果を図6(B)に示す。 When determining whether or not the soil is actually oil-contaminated soil, it may be determined whether or not the odor level exceeds a certain threshold. In this example, however, odor levels were measured over time for performance testing of the system of the present invention. The result is shown in FIG. As a comparison, the odor level was measured over time by the conventional measurement method of FIG. 7, and the result is shown in FIG. 6 (B).
図6(A)によれば、循環式の本発明のシステムでは臭気センサー14の指示値が測定開始時から2分程度で安定した。従って測定開始時から2分以後に測定した臭い成分を収束値とみなすことができる。これに対して図6(B)によれば非循環式の測定器では測定開始時から2分を経過した後も測定値が上昇し続けた。従って本願発明の方が測定数値が早く安定する。また、例えば試料番号2及び3が同じ濃度(A重油濃度0.1%)であり、非循環式ではばらつきが測定されたが、本願の循環式では、ほとんど測定に差が見られない。同じ濃度であっても、高い濃度の場合は高い指示値に、低い濃度の場合は低い指示値に測定できるので、濃度に応じた適切な指示値が精度よく、かつ明確に得られる。 According to FIG. 6A, in the circulation type system of the present invention, the indicated value of the odor sensor 14 was stabilized in about 2 minutes from the start of measurement. Therefore, the odor component measured after 2 minutes from the start of measurement can be regarded as the convergence value. On the other hand, according to FIG. 6B, the measured value continued to rise even after 2 minutes had elapsed from the start of the measurement in the non-circular measuring device. Therefore, the measured value is stabilized earlier in the present invention. Further, for example, sample numbers 2 and 3 have the same concentration (A heavy oil concentration 0.1%), and variation was measured in the non-circulation type, but almost no difference was observed in the measurement in the circulation type of the present application. Even if the concentration is the same, a high indication value can be measured at a high concentration, and a low indication value can be measured at a low concentration, so that an appropriate indication value corresponding to the concentration can be obtained accurately and clearly.
上述の実施形態及び実施例は本発明の技術的性質を説明するための例であり、これらによって、本発明の技術的範囲が限定されるものではない。 The above-described embodiments and examples are examples for explaining the technical properties of the present invention, and the technical scope of the present invention is not limited by these.
1…油汚染土壌用定量測定システム
2…試料容器 4…容器本体 4a…底部 4b…胴部 4c…口頸部
6…蓋部 6a…蓋周壁 6b…蓋板
8…第1通気口 8a…第1通気孔 8b…第1通気パイプ
9…第2通気口 9a…第2通気孔 9b…第2通気パイプ
12A…第1連通管 12B…第2連通管
14…臭気センサー 16…吸気口 18…排気口
20…空気通路 22…センサー本体
24…臭気検知素子 24a…検出電極 24b…臭気成分感応部
26…電気回路 28…測定結果表示手段
30…吸引排気手段
32…定温保持手段
C…空気循環路 D…閉鎖具 S…試料サンプル W…水
DESCRIPTION OF SYMBOLS 1 ... Quantitative measurement system for oil-contaminated soil 2 ... Sample container 4 ... Container main body 4a ... Bottom part 4b ... Trunk part 4c ... Mouth neck part 6 ... Lid part 6a ... Lid peripheral wall 6b ... Lid plate 8 ... 1st vent 8a ... 1st DESCRIPTION OF SYMBOLS 1 ventilation hole 8b ... 1st ventilation pipe 9 ... 2nd ventilation hole 9a ... 2nd ventilation hole 9b ... 2nd ventilation pipe 12A ... 1st communication pipe 12B ... 2nd communication pipe 14 ... Odor sensor 16 ... Intake port 18 ... Exhaust Port 20 ... Air passage 22 ... Sensor body 24 ... Odor detection element 24a ... Detection electrode 24b ... Odor component sensitive part 26 ... Electric circuit 28 ... Measurement result display means 30 ... Suction / exhaust means 32 ... Constant temperature holding means
C ... Air circulation path D ... Closing tool S ... Sample sample W ... Water
Claims (2)
吸気口及び排気口を有し、吸気口から臭気成分を含む空気を取り込み、臭気の強度を測定した後に排気口より排気するように構成した臭気センサーと、
試料容器の第1通気口を臭気センサーの吸気口へ、かつ、臭気センサーの排気口を試料容器の第2通気口へそれぞれ接続した連通管と、
を具備し、
これら連通管と試料容器及び臭気センサーの各内部とを通る循環式の空気循環路を構成し、
上記試料容器は、容器本体の口部に着脱自在に装着した蓋部を有するとともに、これら蓋部に一対の通気孔を開口しており、
上記第1通気口は、上記一対の通気孔の一方に、当該一方通気孔から容器本体の上半部内まで延びる第1通気パイプを挿入してなり、
上記第2通気口は、上記一対の通気孔の他方に、当該他方通気孔から容器本体の底部付近へ延びる第2通気パイプを挿入してなることを特徴とする、持ち運び可能な、油汚染土壌用臭気定量測定システム。 A sample container which has a first ventilation port for air supply and a second ventilation port for return air, and is sealed except for these ventilation ports;
An odor sensor having an intake port and an exhaust port, configured to take in air containing an odor component from the intake port, measure the odor intensity, and then exhaust from the exhaust port;
A communication pipe connecting the first vent of the sample container to the inlet of the odor sensor and the exhaust port of the odor sensor to the second vent of the sample container;
Comprising
A circulation type air circulation path that passes through these communication pipes and each inside of the sample container and the odor sensor is constructed .
The sample container has a lid part that is detachably attached to the mouth part of the container body, and has a pair of vent holes in the lid part.
The first vent is formed by inserting, into one of the pair of vents, a first vent pipe extending from the one vent into the upper half of the container body,
The second vent hole is formed by inserting a second vent pipe extending from the other vent hole to the vicinity of the bottom of the container main body into the other of the pair of vent holes. Odor quantitative measurement system.
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