JPH0894598A - Measuring device for readily evaluating separative power of ceramic to separate nitrogen from carbon dioxide - Google Patents
Measuring device for readily evaluating separative power of ceramic to separate nitrogen from carbon dioxideInfo
- Publication number
- JPH0894598A JPH0894598A JP30593193A JP30593193A JPH0894598A JP H0894598 A JPH0894598 A JP H0894598A JP 30593193 A JP30593193 A JP 30593193A JP 30593193 A JP30593193 A JP 30593193A JP H0894598 A JPH0894598 A JP H0894598A
- Authority
- JP
- Japan
- Prior art keywords
- carbon dioxide
- nitrogen
- sample
- measuring device
- gas
- 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.)
- Granted
Links
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 80
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 39
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 39
- 239000000919 ceramic Substances 0.000 title claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 title abstract description 6
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 24
- 230000014759 maintenance of location Effects 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 7
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 6
- 239000010935 stainless steel Substances 0.000 abstract description 6
- 239000012159 carrier gas Substances 0.000 abstract description 4
- 239000011521 glass Substances 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract description 3
- 239000001307 helium Substances 0.000 abstract description 2
- 229910052734 helium Inorganic materials 0.000 abstract description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 description 16
- 238000000926 separation method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000000741 silica gel Substances 0.000 description 5
- 229910002027 silica gel Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000002513 implantation Methods 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 229910001872 inorganic gas Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】今日、地球規模の温暖化が大きな
社会問題となりつつあり、その主要原因物質のひとつは
工場等から排出される二酸化炭素であると言われてい
る。地球温暖化を解決するには、既に排出された二酸化
炭素を回収して固定したり、排ガス発生源での高濃度か
つ高温二酸化炭素の分離・回収等の技術開発が急務であ
る。高温二酸化炭素の分離・回収には有機系分離材料で
は耐熱性に問題があり、使用することができない。した
がって、熱的に安定なセラミックスが分離材料の有力候
補に挙がるが、その二酸化炭素分離能評価は出来る限り
簡便かつ迅速に行えることが望まれる。しかるに、本発
明は、窒素と二酸化炭素の分離能を簡便かつ迅速に評価
する装置を提供するものである。[Industrial application] Today, global warming is becoming a major social problem, and one of the main causative substances is carbon dioxide emitted from factories and the like. In order to solve global warming, there is an urgent need for technological development such as collecting and fixing already emitted carbon dioxide, and separating and recovering high-concentration and high-temperature carbon dioxide at an exhaust gas source. Organic separation materials cannot be used for separation / recovery of high-temperature carbon dioxide because of problems with heat resistance. Therefore, thermally stable ceramics are listed as a strong candidate for the separation material, but it is desired that the carbon dioxide separation ability can be evaluated as easily and quickly as possible. Therefore, the present invention provides a device for easily and quickly evaluating the separation ability of nitrogen and carbon dioxide.
【０００２】[0002]
【従来の技術】従来、セラミックスの窒素と二酸化炭素
の分離能は、ガス吸着量測定装置によりそれぞれの吸着
等温線を測定して評価している。ガス吸着量測定装置に
よる吸着等温線の測定は、定圧定容のガスを試料に１パ
ルス毎に導入し、各パルス毎に吸着平衡に達するまで放
置する。１パルス毎の吸着平衡に達するまでの時間は、
短くて数分間、長いと１時間程度にもなる。したがっ
て、吸着等温線を測定する時間は非常に長く、１試料を
測定するのに２４時間を費やすこともよくある。また、
ガス吸着量測定装置は非常に高価な物である。2. Description of the Related Art Conventionally, the ability of ceramics to separate nitrogen and carbon dioxide has been evaluated by measuring the respective adsorption isotherms of a gas adsorption amount measuring device. In the measurement of the adsorption isotherm by the gas adsorption amount measuring device, a gas at a constant pressure and a constant volume is introduced into the sample for each pulse, and the sample is left until the equilibrium is reached for each pulse. The time to reach adsorption equilibrium for each pulse is
It can be as short as a few minutes and as long as an hour. Therefore, the time to measure the adsorption isotherm is very long, and it often takes 24 hours to measure one sample. Also,
The gas adsorption amount measuring device is very expensive.
【０００３】[0003]
【発明が解決しようとする課題】工場等の固定発生源か
ら排出される高温状態の窒素と二酸化炭素を分離するセ
ラミックス分離材を開発する場合、評価に多大な経費や
時間を費やすことなく、簡便かつ迅速に行えることが求
められている。本発明は、セラミックスの窒素と二酸化
炭素の分離能を簡便かつ迅速に測定する装置を提供する
ものである。SUMMARY OF THE INVENTION When developing a ceramic separation material for separating nitrogen and carbon dioxide in a high-temperature state discharged from a fixed source such as a factory, it is simple to use without much expenditure and time for evaluation. It is required to be able to do it quickly. The present invention provides a device for simply and quickly measuring the ability of ceramics to separate nitrogen and carbon dioxide.
【０００４】[0004]
【課題を解決するための手段】本発明は、セラミックス
の窒素と二酸化炭素の分離能を簡便かつ迅速に測定する
装置を提供するものである。SUMMARY OF THE INVENTION The present invention provides an apparatus for simply and quickly measuring the ability of ceramics to separate nitrogen and carbon dioxide.
【０００５】セラミックスにガスを接触させるとガスは
セラミックスの表面に吸着し、しばらくしてから脱離す
る。ガス吸着はセラミックスの温度の低いときは物理吸
着と化学吸着の両方が生じるが、温度が高くなると化学
吸着のみが生じることになる。これを換言すれば、物理
吸着は弱い吸着であり、化学吸着は強い吸着である。ガ
スがセラミックス表面に吸着してから脱離するまでの時
間をリテンションタイムと定義すると、リテンションタ
イムはガスの吸着能あるいは脱離能の強さに相当する。
すなわち、リテンションタイムが長い場合はガスがセラ
ミックス表面に強く吸着しており、容易に脱離しない状
態であることを示唆している。一方、リテンションタイ
ムが短い場合はガスとセラミックス表面との相互作用は
弱く、ガスは容易にセラミックス表面から脱離すること
を示唆している。したがって、セラミックスに対する窒
素と二酸化炭素のそれぞれのリテンションタイムを測定
し、それらの差を求め、その差が大きいほど窒素と二酸
化炭素の分離能は優れていることになる。When a gas is brought into contact with ceramics, the gas is adsorbed on the surface of the ceramics and desorbed after a while. In gas adsorption, when the temperature of the ceramics is low, both physical adsorption and chemical adsorption occur, but when the temperature is high, only chemical adsorption occurs. In other words, physical adsorption is weak adsorption and chemical adsorption is strong adsorption. If the retention time is defined as the time from when the gas is adsorbed on the ceramic surface to when it is desorbed, the retention time corresponds to the strength of gas adsorption or desorption.
That is, it is suggested that when the retention time is long, the gas is strongly adsorbed on the ceramic surface and is not easily desorbed. On the other hand, when the retention time is short, the interaction between the gas and the ceramic surface is weak, suggesting that the gas is easily desorbed from the ceramic surface. Therefore, the retention times of nitrogen and carbon dioxide with respect to the ceramics are measured, the difference between them is determined, and the larger the difference, the better the separability of nitrogen and carbon dioxide.
【０００６】以上の原理を利用して作成した本発明の測
定装置を図１に示す。装置は試料充填部（１）、試料加
熱部（２）、分析部（４）、記録部（５）、窒素／二酸
化炭素注入部（６）から成る。試料充填部はセラミック
ス試料を充填する部分であり、内径３ｍｍφ、長さ１ｍ
程度のステンレス製あるいはガラス製のパイプである。
パイプの材質および規格は、測定する試料の種類あるい
は測定条件により適当に選べばよい。直管でもＵ字管で
も形状は構わない。試料加熱部は電気炉であり、試料温
度を一定に保持する温度制御装置（３）の付いているこ
とが望ましい。また、電気炉の規格は測定する温度によ
り適当に選べばよい。分析部はＴＣＤ付ガスクロマトグ
ラフイ であり、デ−タはペンレコ−ダに記録させる。ガ
スクロマトグラフイ の検出器にはＦＩＤとＴＣＤの２種
類があるが、前者は無機ガスに対して全く感知しないこ
とから、後者の検出器を有するガスクロマトグラフイ を
用いる。ラインはステンレス製あるいはガラス製のパイ
プでつながれており、キャリア−ガスとしてヘリウムを
２０ｍｌ／ｍｉｎ程度流す。試料充填部の前にパイプに
横穴を開けてゴム栓を取り付けた窒素／二酸化炭素注入
部がある。ここからマイクロシリンジに採った窒素と二
酸化炭素の混合ガスを打ち込み、測定を開始する。窒素
／二酸化炭素注入部にガスサンプラ−を取り付ければガ
スの注入はより容易になる。FIG. 1 shows a measuring device of the present invention produced by utilizing the above principle. The device comprises a sample filling section (1), a sample heating section (2), an analysis section (4), a recording section (5) and a nitrogen / carbon dioxide injection section (6). The sample filling part is a part for filling the ceramics sample, and the inner diameter is 3 mmφ and the length is 1 m.
It is a pipe made of stainless steel or glass.
The material and standard of the pipe may be appropriately selected according to the type of sample to be measured or the measurement conditions. The shape may be a straight pipe or a U-shaped pipe. The sample heating unit is an electric furnace, and is desirably provided with a temperature control device (3) for keeping the sample temperature constant. The specification of the electric furnace may be appropriately selected depending on the temperature to be measured. The analyzer is a gas chromatograph with a TCD, and the data is recorded on a pen recorder. There are two types of gas chromatograph detectors, FID and TCD, but since the former does not sense inorganic gas at all, gas chromatographs with the latter detector are used. The lines are connected by stainless steel or glass pipes, and helium flows at a flow rate of about 20 ml / min as a carrier gas. There is a nitrogen / carbon dioxide injection unit in which a horizontal hole is made in the pipe and a rubber stopper is attached in front of the sample filling unit. From here, a mixed gas of nitrogen and carbon dioxide taken into the micro syringe is injected to start the measurement. If a gas sampler is attached to the nitrogen / carbon dioxide injection part, gas injection becomes easier.
【０００７】本発明の測定装置を用いれば測定時間は、
１試料当たり短い場合で５分、長い場合でも１０分程度
で終了する。また、分離能はペンレコ−ダに描かれた窒
素と二酸化炭素のそれぞれのリテンションタイムを調べ
るだけでよいので評価も非常に早く、簡単である。With the measuring device of the present invention, the measuring time is
The processing is completed in about 5 minutes for a short sample and about 10 minutes for a long sample. Further, the resolution is very quick and simple because the retention time of each of nitrogen and carbon dioxide drawn on the pen recorder needs to be examined.
【０００８】本発明の窒素／二酸化炭素分離能測定装置
を用いて測定した実例を以下の実施例にて示す。[0008] An example of measurement using the apparatus for measuring nitrogen / carbon dioxide separation ability of the present invention is shown in the following examples.
【０００９】[0009]
【００１０】実施例 １ セラミックス試料にシリカゲルの５．０ｇを選び、内径
３ｍｍφ、長さ１ｍのステンレス製カラムに充填し、１
００℃に加熱した。キャリア−ガスを２０ｍｌ／ｍｉｎ
流し、窒素と二酸化炭素の１ｍｌづつをマイクロシリン
ジに採り、窒素／二酸化炭素注入部より試料中に打ち込
んだ。打ち込んだ時間を０分とし、シリカゲルから脱離
してくる窒素および二酸化炭素をガスクロマトグラフイ
で測定し、リテンションタイムを調べた。得られたチャ
−トを図２に示すが、窒素（７）と二酸化炭素（８）の
リテンションタイムは、前者が０．５４分、後者が１．
２９分であり、この結果シリカゲルは１００℃において
両者のガスを分離することが可能であることが判明し
た。測定時間は２分程度である。Example 1 5.0 g of silica gel was selected as a ceramic sample and packed in a stainless steel column having an inner diameter of 3 mm and a length of 1 m.
Heated to 00 ° C. Carrier gas 20ml / min
The mixture was poured, and 1 ml each of nitrogen and carbon dioxide was taken in a microsyringe and injected into the sample from a nitrogen / carbon dioxide injection part. The nitrogen and carbon dioxide desorbed from the silica gel are gas chromatographed with the time of implantation set to 0 minutes.
And retention time was examined. The resulting chart is shown in FIG. 2. The retention times of nitrogen (7) and carbon dioxide (8) were 0.54 minutes for the former and 1.0 for the latter.
It was 29 minutes, and as a result, it was found that the silica gel can separate both gases at 100 ° C. The measurement time is about 2 minutes.
【００１１】実施例 ２ セラミックス試料にモレキュラ−シ−ブ１３Ｘの４．０
ｇを選び、内径３ｍｍφ、長さ１ｍのステンレス製カラ
ムに充填し、３００℃に加熱した。キャリア−ガスを２
０ｍｌ／ｍｉｎ流し、窒素と二酸化炭素の１ｍｌづつを
マイクロシリンジに採り、窒素／二酸化炭素注入部より
試料中に打ち込んだ。打ち込んだ時間を０分とし、シリ
カゲルから脱離してくる窒素および二酸化炭素をガスク
ロマトグラフイ で測定し、リテンションタイムを調べ
た。得られたチャ−トを図３に示すが、窒素（７）と二
酸化炭素（８）のリテンションタイムは、前者が０．８
５分、後者が３．００分であり、この結果モレキュラ−
シ−ブ１３Ｘは３００℃において両者のガスを分離する
ことが可能であることが判明した。測定時間は４分程度
である。Example 2 A ceramic sample having a molecular sieve 13X of 4.0 was used.
g was selected, packed in a stainless steel column having an inner diameter of 3 mmφ and a length of 1 m, and heated to 300 ° C. Carrier-gas 2
Flowing at 0 ml / min, 1 ml each of nitrogen and carbon dioxide was collected in a microsyringe, and was injected into the sample from the nitrogen / carbon dioxide injection part. The retention time was examined by measuring the nitrogen and carbon dioxide desorbed from the silica gel by gas chromatography with the time of implantation being 0 minute. The chart obtained is shown in Fig. 3. The retention time of nitrogen (7) and carbon dioxide (8) was 0.8 for the former.
5 minutes, the latter being 3.00 minutes, resulting in molecular
It was found that the sheave 13X can separate both gases at 300 ° C. The measurement time is about 4 minutes.
【００１２】[0012]
【発明の効果】本発明は、窒素／二酸化炭素分離材を開
発するときに必要な性能評価を簡便かつ迅速に測定する
ことのできる装置を提供するものであり、セラミックス
分離材の製品開発に多大な貢献を及ぼすものと考えられ
る。The present invention provides an apparatus which can easily and quickly measure the performance evaluation required for developing a nitrogen / carbon dioxide separating material, and is very useful for developing a ceramic separating material. It is considered to make a significant contribution.
【図１】本発明の構成図。FIG. 1 is a configuration diagram of the present invention.
【図２】１００℃に加熱したシリカゲルの窒素と二酸化
炭素のクロマトグラフ。FIG. 2 is a chromatogram of nitrogen and carbon dioxide on silica gel heated to 100 ° C.
【図３】３００℃に加熱したモレキュラ−シ−ブ１３Ｘ
の窒素と二酸化炭素のクロマトグラフ。FIG. 3 Molecular sieve 13X heated to 300 ° C.
Nitrogen and carbon dioxide chromatograph.
１ 試料充填部 ２ 試料加熱部 ３ 温度制御装置 ４ 分析部 ５ 記録部 ６ 窒素／二酸化炭素注入部 ７ 窒素のクロマトグラフ ８ 二酸化炭素のクロマトグラフ DESCRIPTION OF SYMBOLS 1 Sample filling part 2 Sample heating part 3 Temperature control device 4 Analysis part 5 Recording part 6 Nitrogen / carbon dioxide injection part 7 Chromatograph of nitrogen 8 Chromatograph of carbon dioxide
Claims (2)
能を簡便に評価する測定装置。1. A measuring device for easily evaluating the ability of ceramics to separate nitrogen and carbon dioxide.
分析部、記録部、窒素／二酸化炭素注入部から成る、請
求項１に記載の分離能を簡便に評価する測定装置。2. The measuring device comprises a sample filling section, a sample heating section,
The measuring device according to claim 1, which comprises an analysis unit, a recording unit, and a nitrogen / carbon dioxide injection unit, for easily evaluating the separability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5305931A JP2642856B2 (en) | 1993-11-10 | 1993-11-10 | Measuring device for easily evaluating the separation ability of ceramics for nitrogen and carbon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5305931A JP2642856B2 (en) | 1993-11-10 | 1993-11-10 | Measuring device for easily evaluating the separation ability of ceramics for nitrogen and carbon dioxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0894598A true JPH0894598A (en) | 1996-04-12 |
| JP2642856B2 JP2642856B2 (en) | 1997-08-20 |
Family
ID=17951026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5305931A Expired - Lifetime JP2642856B2 (en) | 1993-11-10 | 1993-11-10 | Measuring device for easily evaluating the separation ability of ceramics for nitrogen and carbon dioxide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2642856B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115728123A (en) * | 2022-11-15 | 2023-03-03 | 中海石油(中国)有限公司 | Evaluation experiment method for simulating hydrogen sulfide output in thermal recovery process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03110444A (en) * | 1989-09-25 | 1991-05-10 | Mitsubishi Kasei Corp | Method and device for measuring adsorption performance of solid adsorbent |
| JPH04166763A (en) * | 1990-10-30 | 1992-06-12 | Nippon Carbon Co Ltd | Adsorbing type gas chromatography packing agent and preparation thereof |
-
1993
- 1993-11-10 JP JP5305931A patent/JP2642856B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03110444A (en) * | 1989-09-25 | 1991-05-10 | Mitsubishi Kasei Corp | Method and device for measuring adsorption performance of solid adsorbent |
| JPH04166763A (en) * | 1990-10-30 | 1992-06-12 | Nippon Carbon Co Ltd | Adsorbing type gas chromatography packing agent and preparation thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115728123A (en) * | 2022-11-15 | 2023-03-03 | 中海石油(中国)有限公司 | Evaluation experiment method for simulating hydrogen sulfide output in thermal recovery process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2642856B2 (en) | 1997-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5435169A (en) | Continuous monitoring of organic pollutants | |
| US5773713A (en) | Environmental monitoring of organic compounds | |
| Baltussen et al. | Equilibrium sorptive enrichment on poly (dimethylsiloxane) particles for trace analysis of volatile compounds in gaseous samples | |
| Hamilton et al. | Application of gas chromatography to respiratory gas analysis | |
| Dobrzyńska et al. | Needle‐trap device for the sampling and determination of chlorinated volatile compounds | |
| Clark et al. | Evaluation of a Tenax GC sampling procedure for collection and analysis of vehicle-related aromatic and halogenated hydrocarbons in ambient air | |
| Stan et al. | All-glass open-split interface for gas chromatography-mass spectrometry | |
| JP2642856B2 (en) | Measuring device for easily evaluating the separation ability of ceramics for nitrogen and carbon dioxide | |
| Dietrich et al. | Sampling for organic chemicals in workplace atmospheres with porous polymer beads | |
| Timms et al. | The determination of impurities in carbon dioxide by gas chromatography, with special reference to coolant gas for nuclear reactors | |
| RU2196319C2 (en) | Procedure measuring specific surface of dispersive and porous materials | |
| Sanchez et al. | Use of a chromatographic column to improve the selectivity of the SnO2 gas sensors: first approach towards a miniaturised device and selective with hydrogen fluoride vapours | |
| US4067227A (en) | Hydrogen transfer system for gas chromatograph | |
| JP7169775B2 (en) | Separation method by gas chromatography, gas chromatograph device, gas analyzer, concentrator tube, concentrator, method for manufacturing concentrator tube, and gas detector | |
| Dubois et al. | The analysis of carbon monoxide in urban air at the ppm level, and the normal carbon monoxide value | |
| Pyo et al. | Monitoring the mobile phase composition in supercritical fluid chromatography | |
| Moore et al. | Theory and practice in the development of a multisorbent passive dosimeter system | |
| JPH0821831A (en) | Simple separative power evaluating method for nitrogen and carbon dioxide of ceramic | |
| Tang et al. | A multipurpose sampling loop for analysis of nanogram to milligram per cubic meter levels of sulfur compounds in the atmosphere, natural gas and gaseous fuels | |
| JPS6217707Y2 (en) | ||
| MORALES et al. | Air sampling and analytical procedures for benzidine, 3, 3′-dichlorobenzidine and their salts | |
| Yamamoto et al. | Determination of ammonia in the atmosphere by gas chromatography with a flame thermionic detector | |
| Kristóf et al. | Continuous determination of carbon monoxide evolved during thermal decomposition reactions | |
| JPH0252235A (en) | Sampling air specimen | |
| Meacham et al. | Design and operation of a chromatograph with sorption-effect detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |