Flames argon-oxygen-hydrogen

Collisional Ionization of Sodium Atoms Excited by One- and Two-Photon Absorption in a Hydrogen-Oxygen-Argon Flame... 

Staude, S. Hecht, C Wlokas, L Schulz, C. Atakan, B. (2009). Experimental and Niuneiical Investigation of Fe(CO)s Addition to a Laminar Premixed Hydrogen/Oxygen/ Argon Flame, Z. Phys. Chem., Vol. 223, pp. 639-649, ISSN 0942-9352... 

The device (Figure 10.6) necessary for the sample preparation consisted of a blowpipe incorporated into an appendix chamber of the spectroscope under a flow of a pure argon atmosphere during the treatment in a hydrogen/oxygen flame. Water vapor was trapped on a platinum wall situated in the direct vicinity of the sample and cooled with liquid nitrogen. Immediately after the flame treatment, the chamber was pumped for 2 min, the sample was introduced into the spectroscope, and the LEED-Auger characterizations were carried out. The LEED pattern of the defined... 

Platinum sheets of thickness 0.5 mm (Alfa, 99.99%) were used as a working electrode. Directly before use, the Pt substrate was cleaned for 10 min in an ultrasonic bath in acetone then heated in a hydrogen flame to red glow for a few minutes. Pt-wires (Alfa, 99.99%) were used as reference and counter electrodes, respectively. A quartz round flask was used as an electrochemical cell. The electrodeposition experiments were performed in an argon-filled glove box with water and oxygen below 1 ppm. 

Atomization of the hydrides is currently believed to proceed via interaction with free hydrogen radicals oxygen also plays an active role. In argon/hydrogen diffusion flames and quartz tube atomizers, a cloud of hydrogen radicals is formed by reactions between hydrogen and oxygen ... 

For the thermal conductivity detector, helium is the most popular. While hydrogen is commonly used in some parts of the world (where helium is very expensive), it is not recommended because of the potential for fire and explosions. With the flame ionization detector, either nitrogen or helium may be used. Nitrogen provides slightly more sensitivity, but a slower analysis than helium. For the electron capture detector, very dry, oxygen-free nitrogen, or a mixture of argon with 5% methane is recommended. 

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