JPS6373148A - Heat extraction gaschromatograph - Google Patents

Heat extraction gaschromatograph

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Publication number
JPS6373148A
JPS6373148A JP11324986A JP11324986A JPS6373148A JP S6373148 A JPS6373148 A JP S6373148A JP 11324986 A JP11324986 A JP 11324986A JP 11324986 A JP11324986 A JP 11324986A JP S6373148 A JPS6373148 A JP S6373148A
Authority
JP
Japan
Prior art keywords
desorption
adsorbent
adsorption
chamber
sample
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11324986A
Other languages
Japanese (ja)
Inventor
Ichiji Miyata
一司 宮田
Yoshiyuki Nagataki
義幸 長瀧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP11324986A priority Critical patent/JPS6373148A/en
Publication of JPS6373148A publication Critical patent/JPS6373148A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To improve the accuracy and the sensitivity of analysis, by providing an adsorption part and a desorption part in a heat extraction part, and providing a cooling device in the adsorption part, and providing a heating device in the desorption part. CONSTITUTION:This apparatus is composed of a sample chamber, an adsorption chamber, a desorption chamber, an absorbent holding cartridge 40 and an adsorbent 50. In the sample chamber, a sample 5 is heated to gasify a volatile component. A container is made of stainless steel. A heating device 10 is provided at the outer surface of the container. The inner surface of the container is lined with glass. A cooling device 20 is provided in the adsorption chamber in order to ensure the adsorption of intended component gas into the asorbent 50. A heating device 11 for heating the absorbent 50 and for the desorption of desorption gas is provided in the desorption chamber. Thus, the intended component of the analysis can undergo desorption from the absorbent in a short time, and the accuracy and the sensitivity of the analysis can be improved.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は熱抽出ガスクロマトグラフに係わり、さらに詳
しくは、熱抽出部の改良に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to thermal extraction gas chromatographs, and more particularly to improvements in thermal extraction sections.

〔従来の技術〕[Conventional technology]

ガスクロマトグラフ分析法は、揮発性物質の微量分析に
非常に有用な分析法である。それだけに試料採取法が試
料成分の定性、定量分析結果に犬きく影響する。このた
め試料につぎのような操作が施されることが多い。一つ
は分析の目的成分から不揮発物質や水などの分離操作で
あり、もう一つは目的成分の純化濃縮操作である。
Gas chromatography is a very useful analytical method for trace analysis of volatile substances. Therefore, the sample collection method greatly influences the qualitative and quantitative analysis results of sample components. For this reason, the following operations are often performed on the sample. One is an operation for separating non-volatile substances, water, etc. from the target component of analysis, and the other is an operation for purifying and concentrating the target component.

このような方法の一つとして熱抽出法がある。One such method is thermal extraction.

この熱抽出法とは、キャリアガスを流しながら試料を加
熱し、分析目的成分をガス化してキャリアガスと共に流
出させ、このガスを吸着剤と接触させて分析目的成分を
吸着剤に吸着させる。このように吸着した成分をその後
吸着剤を加熱することによって吸着剤から脱着させ、こ
れをキャリアガスと一緒にガスクロマトグラフ装置に導
入して分析する方法である。
This thermal extraction method involves heating a sample while flowing a carrier gas, gasifying the target component to be analyzed and causing it to flow out together with the carrier gas, and bringing this gas into contact with an adsorbent to cause the component to be analyzed to be adsorbed by the adsorbent. In this method, the components thus adsorbed are then desorbed from the adsorbent by heating the adsorbent, and then introduced into a gas chromatograph apparatus together with a carrier gas for analysis.

従来のこの種装置は吸着剤は、一定の場所に固定し、吸
着、脱着を同一位置で行なうものである。
In conventional devices of this type, the adsorbent is fixed at a fixed location and adsorption and desorption are performed at the same location.

よって吸着時に吸着剤を冷却する装置を設置する場所が
なく、熱抽出に伴う熱がキャリアガスと共に持ち来たさ
れ、吸着剤は室温以上になりがちであり、また脱着時に
は吸着操作が終って後、加熱するため、脱着に必要な温
度に加熱するのに時間を要した。
Therefore, there is no place to install a device to cool the adsorbent during adsorption, the heat associated with heat extraction is carried along with the carrier gas, and the adsorbent tends to reach a temperature above room temperature. , it took time to heat up to the temperature required for desorption.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

揮発性物質を吸着させるには、吸着剤の温度は低い方が
望ましい。成分によっては室温以下にまで冷却する必要
があるが、従来の装置では吸着剤の温度が室温以上にな
り吸着が十分に行なわれないという欠点がある。
In order to adsorb volatile substances, it is desirable that the temperature of the adsorbent be low. Depending on the component, it may be necessary to cool it down to room temperature or below, but conventional devices have the disadvantage that the temperature of the adsorbent rises above room temperature and adsorption is not performed sufficiently.

一方脱着するためには吸着剤を加熱するが、分析の精度
、感度を良くするにはできるだけ早く所定温度にまで吸
着剤を昇温し、目的成分を短時間に脱着させる必要があ
る。さもないと、ガスクロマトグラフのピーク幅が広く
なり、ピークが重なったり、分離が悪くなったりする。
On the other hand, in order to desorb, the adsorbent is heated, but in order to improve the accuracy and sensitivity of analysis, it is necessary to raise the temperature of the adsorbent to a predetermined temperature as quickly as possible to desorb the target component in a short time. Otherwise, the peak width of the gas chromatograph will become wide, leading to overlapping peaks and poor separation.

この欠点をなくすため、加熱装置の温度を高くし短時間
に吸着剤を昇温しようとすると、吸着剤温度が所定温度
より上昇し過ぎ、吸着剤の寿命を著しく短かいものにす
ることになる。
In order to eliminate this drawback, if you try to raise the temperature of the adsorbent in a short time by increasing the temperature of the heating device, the adsorbent temperature will rise too much above the specified temperature and the life of the adsorbent will be significantly shortened. .

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、熱抽出装置において、吸着部と脱着部とを別
な個所に設けると共に、吸着部には冷却装置を備え、脱
着部には加熱装置を設置することによって上記欠点を解
決しようとするものである。
The present invention attempts to solve the above-mentioned drawbacks by providing an adsorption section and a desorption section in separate locations in a heat extraction device, and providing a cooling device in the adsorption section and a heating device in the desorption section. It is something.

加熱装置を備えた試料室に試料を置き、キャリアガスを
通しながら加熱することによって、試料よシ揮発性の分
析目的成分をガス化して吸着室に導く。こ−で冷却され
ている吸着剤と接触することによって目的成分を吸着剤
に吸着させる。
By placing a sample in a sample chamber equipped with a heating device and heating it while passing a carrier gas, volatile components of interest in the sample are gasified and introduced into the adsorption chamber. By coming into contact with the cooled adsorbent, the target component is adsorbed onto the adsorbent.

この吸着操作が行なわれている間にも、脱着室は加熱装
置で加熱し所定の温度に保っておく。そして上述の吸着
操作によって目的成分を十分吸着した吸着剤を脱着室に
移動することによって、吸着剤の温度を可及的速やかに
目的温度に昇温する。
Even while this adsorption operation is being performed, the desorption chamber is heated by a heating device and maintained at a predetermined temperature. Then, by moving the adsorbent that has sufficiently adsorbed the target component through the above-described adsorption operation to the desorption chamber, the temperature of the adsorbent is raised to the target temperature as quickly as possible.

これによって分析目的成分を短時間に吸着剤から脱着で
き、分析の精度と感度を改善することができる。
As a result, the component to be analyzed can be desorbed from the adsorbent in a short time, and the accuracy and sensitivity of analysis can be improved.

とのさい吸着剤の吸着室と脱着室への移動は、qILW
剤をカートリッジ内に保持し、このカートリッジを移動
させることによって容易かつ確実に行なうことができる
The transfer of the adsorbent to the adsorption chamber and desorption chamber is carried out using qILW.
This can be easily and reliably carried out by holding the agent in a cartridge and moving this cartridge.

〔発明の構成・作用〕[Structure and operation of the invention]

本発明に基づく熱抽出装置の一例を第1図に示す。 An example of a heat extraction device according to the present invention is shown in FIG.

構成は試料室、吸着室、脱着室、吸着剤保持カートリッ
ジ、吸着剤よりなっている。
The structure consists of a sample chamber, an adsorption chamber, a desorption chamber, an adsorbent holding cartridge, and an adsorbent.

試料室は試料を加熱し揮発成分をガス化する装置で、耐
熱耐酸化性材料であるステンレス鋼で容器を作り、その
外周に加熱装置10を備えており、容器の内面は加熱さ
れてもガスの放出がなく、また試料成分と400〜50
0℃においても反応しないガラスでライニングしである
The sample chamber is a device that heats the sample and gasifies the volatile components.The container is made of stainless steel, which is a heat-resistant and oxidation-resistant material, and is equipped with a heating device 10 around its outer periphery. There is no release of
It is lined with glass that does not react even at 0°C.

吸着室は吸着剤えの目的成分ガスの吸着を確実に行なう
ため、室温以下、望ましくは0℃程度に冷却しておく。
The adsorption chamber is cooled to below room temperature, preferably to about 0° C., in order to ensure that the target component gas is adsorbed by the adsorbent.

そのための冷却装置20が設置されている。A cooling device 20 for this purpose is installed.

脱着室は吸着剤を加温し、吸着ガスを脱着させるため加
熱装置11を備えている。
The desorption chamber is equipped with a heating device 11 for heating the adsorbent and desorbing the adsorbed gas.

吸着剤保持カートリッジ40は、非磁性の金属、金属酸
化物、セラミックス、ガラス、石英などの物質で作られ
ている。底部は多孔性としてガスが流通するようにし、
上部は開放されておシ、その上端に磁石台が固着されて
いる。
The adsorbent holding cartridge 40 is made of a material such as non-magnetic metal, metal oxide, ceramics, glass, or quartz. The bottom is porous to allow gas to circulate.
The top is open and a magnetic stand is fixed to the top.

吸着剤50は通常ガスクロマトグラフの充填剤として用
いられている下記の各物質を用いることができる。
As the adsorbent 50, the following substances that are commonly used as packing materials for gas chromatographs can be used.

珪藻土、セライト等にシリコンオイル、シリコンゴム、
ポリエステルおよびポリオールなどを塗布したもの、大
きさ111x〜Q、05/Imの活性炭、多孔性ポリマ
ービーズ、大きさ1顛〜0.05メmのシリカゲル、ア
ルミナおよびモレキエラーシーブである。このうち望ま
しいのは活性炭、多孔性ポリマービーズで、多孔性ポリ
マービーズとしてはTenaxGCおよびTenaxT
A(AKZORESEARCHLAB  社!JI)が
特に望ましいO 上記構成の熱抽出装置の操作は以下のように行なう。
Silicone oil, silicone rubber, diatomaceous earth, celite, etc.
Coated with polyester and polyol, etc., activated carbon of size 111x to Q, 05/Im, porous polymer beads, silica gel of size 1 to 0.05 mm, alumina and molecular sieve. Among these, activated carbon and porous polymer beads are preferred, and examples of porous polymer beads include TenaxGC and TenaxT.
Particularly preferred is A (AKZORESEARCHLAB! JI).O The heat extraction apparatus having the above configuration is operated as follows.

熱抽出操作は吸着剤50を吸着カートリッジ40に入れ
、電磁石30に通電してカートリッジに固着されている
磁石31を吸引して該カートリッジを吸着室に固定する
。ついで冷却装置20を動作させて吸着剤を冷却する。
In the heat extraction operation, the adsorbent 50 is placed in the adsorption cartridge 40, and the electromagnet 30 is energized to attract the magnet 31 fixed to the cartridge, thereby fixing the cartridge in the adsorption chamber. Next, the cooling device 20 is operated to cool the adsorbent.

試料を試料室に入れ密閉したのちキャリアガスコントロ
ールユニット1.2を開いてキャリアガスを流す。この
ときバルブ3を開いて大半のキャリアガスは3を通って
外部に放出されるよう流量をコントロールする。このと
き冷却装置21を動作させ、パイプの内部に充填されて
いる吸着剤を冷却する。そして同時に加熱装置11.1
2.13を加熱状態としておく。
After placing the sample in the sample chamber and sealing it, the carrier gas control unit 1.2 is opened to allow the carrier gas to flow. At this time, the valve 3 is opened and the flow rate is controlled so that most of the carrier gas is discharged to the outside through the valve 3. At this time, the cooling device 21 is operated to cool the adsorbent filled inside the pipe. and at the same time heating device 11.1
2.13 is heated.

ガスクロマトグラフカラムへは、キャリアガス流量コン
トロールユニット4を開いてキャリアガスを流しておく
The carrier gas flow rate control unit 4 is opened to allow carrier gas to flow into the gas chromatography column.

この状態で試料を加熱し、その中に含まれる揮発性成分
をガス化しキャリアガスと共に吸着剤50に導入し吸着
させる。
In this state, the sample is heated to gasify the volatile components contained therein and introduced into the adsorbent 50 together with the carrier gas, where they are adsorbed.

上記の操作によって分析目的成分が十分吸着剤に吸着さ
せたら、次のガスクロマトグラフ分析に移る。
Once the target component has been sufficiently adsorbed onto the adsorbent through the above operations, the next step is gas chromatography analysis.

キャリアガス流量コントロールユニットlとバルブ3を
閉じ、加熱装置10.13を不動作状態とする。電磁石
30を不動作状態にすることによって、吸着剤カートリ
ッジ40を吸着室Aよシ脱ので、吸着剤カートリッジ4
0は脱着室に移動されると急速に加熱され、吸着剤に吸
着していた目的成分を短時間に脱着させる。こうして脱
着された成分ガスはキャリアガス流量コントロールユニ
ット2より流入されているキャリアガスによってガスク
ロマトグラフカラムに導かれ分析される。
The carrier gas flow control unit 1 and the valve 3 are closed and the heating device 10.13 is deactivated. By making the electromagnet 30 inactive, the adsorbent cartridge 40 is removed from the adsorption chamber A.
0 is rapidly heated when moved to the desorption chamber, and the target component adsorbed on the adsorbent is desorbed in a short time. The component gas thus desorbed is guided to a gas chromatography column by the carrier gas flowing in from the carrier gas flow rate control unit 2 and analyzed.

吸着剤は繰り返し使用するため分析終了後再生操作をす
る。
Since the adsorbent is used repeatedly, it is regenerated after the analysis is completed.

この方法は冷却装置20は不動作状態に、冷却装置21
は動作状態とし、バルブ3を全開する。加熱装置はすべ
てを動作状態とし、キャリアガス流量コントロール二二
ツ)1.2.4も開きキャリアガスを流す。とれにより
系内の付着物が焼き出され吸着剤も再生される。
In this method, the cooling device 20 is in an inoperable state, and the cooling device 21 is in an inoperable state.
is in the operating state and valve 3 is fully opened. All of the heating devices are in operation, and the carrier gas flow rate control (2) 1.2.4 is also opened to allow the carrier gas to flow. Due to the removal, deposits in the system are baked out and the adsorbent is also regenerated.

以上の操作法に示した如く、吸着剤に分析目的成分を吸
着させる場合は吸着剤を低温にすることができるので、
吸着が確実に行なわれ、一方脱着する場合は予め加熱さ
れている脱着室に吸着剤を移動させるので急速加熱がで
き、目的成分の脱着が短時間に行なわれるので分析の精
度、感度を向上させることができる。
As shown in the above operating method, when adsorbing the target component to the adsorbent, the adsorbent can be kept at a low temperature.
Adsorption is performed reliably, and when desorption is performed, the adsorbent is moved to a preheated desorption chamber, allowing for rapid heating and desorption of the target component in a short time, improving analysis accuracy and sensitivity. be able to.

なお、吸着剤をカートリッジ式としたことによって、吸
着剤が不良となったさいの交換も容易にできるという効
果もある。
Furthermore, by using a cartridge type adsorbent, there is also the effect that it can be easily replaced when the adsorbent becomes defective.

〔実施例〕〔Example〕

以下に実施例に基づき本発明を具体的に説明する。 The present invention will be specifically described below based on Examples.

実施例 熱抽出およびガスクロマトグラフ分析の操作は上記の操
作法に従って行う。
EXAMPLES The operation of thermal extraction and gas chromatographic analysis is carried out according to the procedure described above.

試料はBHTを0.1重量%含むポリスチレン5りを用
いた。
The sample used was polystyrene 5 containing 0.1% by weight of BHT.

吸着剤は多孔性ポリマービーズTenaxTAを用い、
吸着室の吸着時の温度は10℃とした。
The adsorbent uses porous polymer beads TenaxTA,
The temperature of the adsorption chamber during adsorption was 10°C.

熱抽出のための試料室の温度は250℃とした脱着室の
温度は300℃にした。
The temperature of the sample chamber for thermal extraction was 250°C and the temperature of the desorption chamber was 300°C.

ガスクロマトグラフは、HP5890(ヒエ−レット、
パラカード社製)を用い、カラふとして4ftOOV−
17を用いた。分析時のカラムは10L)℃より毎分1
0℃の昇温速度で300℃まで昇源した。
The gas chromatograph is HP5890 (Hieret,
4ftOOV-
17 was used. The column at the time of analysis is 10L) 1/min from ℃
The temperature was raised to 300°C at a temperature increase rate of 0°C.

得られたガスクロマトグラフチャートを第2図(a)に
示す。
The obtained gas chromatograph chart is shown in FIG. 2(a).

比較例1 熱抽出装置とし吸着室、脱着室が同一場所であ条件とし
た。
Comparative Example 1 A heat extraction device was used, and the conditions were such that the adsorption chamber and the desorption chamber were in the same location.

得られたガスクロマトグラフチャートを第2図(b)に
示す。
The obtained gas chromatograph chart is shown in FIG. 2(b).

比較例2 比較例1で吸着剤を活性炭に代えた以外はすべて同一の
条件とした。
Comparative Example 2 All conditions were the same as in Comparative Example 1 except that activated carbon was used as the adsorbent.

得られ之ガスクロマトグラフチャートを第2図(C)に
示す。
The obtained gas chromatograph chart is shown in FIG. 2(C).

〔発明の効果〕〔Effect of the invention〕

第2図より明らかなように、吸着室と脱着室を同一とし
た熱抽出装置では吸着能のや一方る吸着剤を用いた比較
例1の場合には、吸着時の温度が高いため完全に吸着が
できず、理論量の174程度の測定値しか得られない。
As is clear from Fig. 2, the adsorption capacity of the thermal extraction device with the same adsorption chamber and desorption chamber is low, but in the case of Comparative Example 1, which uses a different adsorbent, due to the high temperature during adsorption, the adsorption capacity is insufficient. Adsorption is not possible and only a measured value of about 174 of the theoretical amount can be obtained.

吸着能の高い吸着剤を用いた場合は比較例2に示すよう
に、吸着は完全であるが脱着が不完全でゴーストビーク
が現われ定量性に劣る。
When an adsorbent with high adsorption capacity is used, as shown in Comparative Example 2, adsorption is complete, but desorption is incomplete, ghost beaks appear, and quantitative performance is poor.

一方、本発明になる吸着室と脱着室とを別に設け、吸着
室には冷却装置を脱着室には加熱装置を備えた熱抽出装
置を用いた場合は、第2図(a)に示したように理論量
の98.1%の測定値が得られ、非常に精度、感度に秀
れた装置である。
On the other hand, in the case where the adsorption chamber and the desorption chamber are provided separately according to the present invention, and a heat extraction device equipped with a cooling device in the adsorption chamber and a heating device in the desorption chamber is used, the system shown in FIG. 2(a) is used. This device is able to obtain a measured value of 98.1% of the theoretical value, and has excellent accuracy and sensitivity.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明にもとづく熱抽出装置の概略図である。 1.2.4:キャリアガス流量コントロールユニット3
:パルプ 5:試料 lO:試料室用加熱装置11:脱
着室用加熱装置 20:吸着室用冷却装置30:電磁石
 31:吸着剤保持カートリッジに固着された磁石 3
5:ガスクロマトグラフ装置40=吸着剤保持カートリ
ッジ 50:吸着剤第2図は本発明と従来例の熱抽出装
置の特性を示す図である。
FIG. 1 is a schematic diagram of a heat extraction device according to the invention. 1.2.4: Carrier gas flow control unit 3
: Pulp 5: Sample lO: Sample chamber heating device 11: Desorption chamber heating device 20: Adsorption chamber cooling device 30: Electromagnet 31: Magnet fixed to adsorbent holding cartridge 3
5: Gas chromatograph device 40 = adsorbent holding cartridge 50: adsorbent FIG. 2 is a diagram showing the characteristics of the heat extraction device of the present invention and the conventional example.

Claims (2)

【特許請求の範囲】[Claims] (1)熱抽出部に吸着部と脱着部とを別に設け、吸着部
には冷却装置を、脱着部には加熱装置を夫々備えたこと
を特徴とする熱抽出ガスクロマトグラフ。
(1) A heat extraction gas chromatograph characterized in that the heat extraction section is provided with an adsorption section and a desorption section separately, the adsorption section is equipped with a cooling device, and the desorption section is equipped with a heating device.
(2)吸着剤をカートリッジ内に保持し、該カートリッ
ジが熱抽出部の吸着部と脱着部とを移動でき、かつ吸着
部と脱着部に夫々固定できるようにした特許請求の範囲
第(1)項記載の熱抽出ガスクロマトグラフ。
(2) The adsorbent is held in a cartridge, and the cartridge is movable between the adsorption part and the desorption part of the heat extraction part, and can be fixed to the adsorption part and the desorption part, respectively. Thermal extraction gas chromatograph as described in Section.
JP11324986A 1986-05-16 1986-05-16 Heat extraction gaschromatograph Pending JPS6373148A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11324986A JPS6373148A (en) 1986-05-16 1986-05-16 Heat extraction gaschromatograph

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11324986A JPS6373148A (en) 1986-05-16 1986-05-16 Heat extraction gaschromatograph

Publications (1)

Publication Number Publication Date
JPS6373148A true JPS6373148A (en) 1988-04-02

Family

ID=14607357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11324986A Pending JPS6373148A (en) 1986-05-16 1986-05-16 Heat extraction gaschromatograph

Country Status (1)

Country Link
JP (1) JPS6373148A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02203268A (en) * 1989-02-02 1990-08-13 Nippon Bunseki Kogyo Kk Analysis by concentrating and vaporizing vapor-phase sample in gas chromatography
JP2004515753A (en) * 2000-11-02 2004-05-27 ダニ ストルメンタツィオーネ アナィリティカ エス.ピー.エー. Focusing device for volatile and semi-volatile organic compounds in the gas phase
JP2008182161A (en) * 2007-01-26 2008-08-07 Hitachi Ltd Silicone liquid containing electric equipment, silicone liquid containing transformer, and measurement method for cyclic compound in silicone liquid used for silicone liquid containing electric equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52104189A (en) * 1975-09-30 1977-09-01 Shimadzu Corp Micro component analysing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52104189A (en) * 1975-09-30 1977-09-01 Shimadzu Corp Micro component analysing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02203268A (en) * 1989-02-02 1990-08-13 Nippon Bunseki Kogyo Kk Analysis by concentrating and vaporizing vapor-phase sample in gas chromatography
JP2004515753A (en) * 2000-11-02 2004-05-27 ダニ ストルメンタツィオーネ アナィリティカ エス.ピー.エー. Focusing device for volatile and semi-volatile organic compounds in the gas phase
JP2008182161A (en) * 2007-01-26 2008-08-07 Hitachi Ltd Silicone liquid containing electric equipment, silicone liquid containing transformer, and measurement method for cyclic compound in silicone liquid used for silicone liquid containing electric equipment

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