scholarly journals Accurate analysis of HCl in biomethane using laser absorption spectroscopy and ion-exchange chromatography

The Analyst ◽  
2021 ◽  
Author(s):  
Javis A. Nwaboh ◽  
Heleen Meuzelaar ◽  
Jiawen Liu ◽  
Stefan Persijn ◽  
Jianrong Li ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Natural Gas ◽  
Ion Exchange ◽  
Absorption Spectroscopy ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Laser Absorption Spectroscopy ◽  
Accurate Analysis ◽  
Laser Absorption ◽  
Gas Supply

Biomethane is a renewable energy gas with great potential to contribute to the diversification and greening of the natural gas supply.

Tunable Diode Laser Absorption Spectroscopy Sensor for Calibration Free Humidity Measurements in Pure Methane and Low CO2 Natural Gas

2016 ◽  
Vol 71 (5) ◽  
pp. 888-900 ◽  
Author(s):  
Javis Anyangwe Nwaboh ◽  
Sonja Pratzler ◽  
Olav Werhahn ◽  
Volker Ebert
Keyword(s):  
Natural Gas ◽  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
Amount Of Substance ◽  
Uncertainty In Measurement ◽  
Laser Absorption ◽  
Combined Uncertainty ◽  
Diode Laser Absorption

We report a new direct tunable diode laser absorption spectroscopy (dTDLAS) sensor for absolute measurements of H2O in methane, ethane, propane, and low CO2 natural gas. The sensor is operated with a 2.7 µm DFB laser, equipped with a high pressure single pass gas cell, and used to measure H2O amount of substance fractions in the range of 0.31–25 000 µmol/mol. Operating total gas pressures are up to 5000 hPa. The sensor has been characterized, addressing the traceability of the spectrometric results to the SI and the evaluation of the combined uncertainty, following the guide to the expression of uncertainty in measurement (GUM). The relative reproducibility of H2O amount of substance fraction measurements at 87 µmol/mol is 0.26% (0.23 µmol/mol). The maximum precision of the sensor was determined using a H2O in methane mixture, and found to be 40 nmol/mol for a time resolution of 100 s. This corresponds to a normalized detection limit of 330 nmol mol−1·m Hz−1/2. The relative combined uncertainty of H2O amount fraction measurements delivered by the sensor is 1.2%.

INTRACAVITY LASER ABSORPTION SPECTROSCOPY OF NO2 AND CH4 COOLED IN A SLIT JET SUPERSONIC EXPANSION

1991 ◽  
Vol 01 (C7) ◽  
pp. C7-471-C7-476
Author(s):  
A. CAMPARGUE ◽  
M. CHENEVIER ◽  
A. DELON ◽  
R. JOST ◽  
F. STOECKEL
Keyword(s):  
Absorption Spectroscopy ◽  
Laser Absorption Spectroscopy ◽  
Supersonic Expansion ◽  
Laser Absorption ◽  
Intracavity Laser

Studies on an Inhibitor of Plasminogen Activation in Human Serum

1973 ◽  
Vol 30 (02) ◽  
pp. 414-424 ◽  
Author(s):  
Ulla Hedner
Keyword(s):  
Ion Exchange ◽  
Human Serum ◽  
Antithrombin Iii ◽  
Gel Filtration ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Specific Adsorption ◽  
Partial Purification ◽  
Plasminogen Activation ◽  
Preparative Electrophoresis

SummaryA procedure is described for partial purification of an inhibitor of the activation of plasminogen by urokinase and streptokinase. The method involves specific adsorption of contammants, ion-exchange chromatography on DEAE-Sephadex, gel filtration on Sephadex G-200 and preparative electrophoresis. The inhibitor fraction contained no antiplasmin, no plasminogen, no α1-antitrypsin, no antithrombin-III and was shown not to be α2 M or inter-α-inhibitor. It contained traces of prothrombin and cerulo-plasmin. An antiserum against the inhibitor fraction capable of neutralising the inhibitor in serum was raised in rabbits.

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