File:A critical study of the Ledebur method for determining oxygen in iron and steel. (1919) (14781648794).jpg

Identifier: criticalstudyo1919118cain (find matches)
Title: A critical study of the Ledebur method for determining oxygen in iron and steel.
Year: 1919 (1910s)
Authors: Cain, J.R. Pettijohn, E.
Subjects:
Publisher: National Bureau of Standards
Contributing Library: NIST Research Library
Digitizing Sponsor: NIST Research Library

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oda lime. Hydrogen would not be oxidized undersuch conditions. Since, as stated, we used carbon-monoxide-freezinc, no iodine pentoxide tube such as proposed is shown precedingthe tube G (Fig. 3), whose function is to remove the carbon dioxidealways present in the hydrogen. If a carbon-monoxide purifierox the type described is used, it should be inserted between thehydrogen generator and G (Fig. 3). The soda-lime tube G alsoserves to remove any hydrogen sulphide. The removal of thetraces of oxygen always likely to be present from air, even whenthe greatest care is used in freeing the generator of air, is securedby the catalyzer. This consists of a %-mch. bore tube of porce-lain, glazed in this case inside and out, heated to 6oo° for 6 inchesin the middle by the electric furnace F (Fig. 3). This tube is 8 Technologic Papers of the Bureau of Standards filled loosely in the heated part with platinized quartz. Thephosphorus pentoxide tube, D, removes the water vapor formed *—•* Dralrv
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Fig. 2.—Electrolytic hydrogen generator by combustion of the oxygen present as impurity, as well as thewater vapor originally present in the gas. Method for Determining Oxygen 9 Electrolytic Hydrogen Generator and Reservoir.—-Hydrogen gaswas generated by the electrolysis of a saturated solution of barium-hydroxide mixed with a 25 per cent solution of sodium hydroxidein a large pyrex glass U tube, using a platinum anode and a nickelcathode. Platinum and nickel were used as the electrode materialsbecause they have a low oxygen and a low hydrogen overvoltage,respectively. The generator (Fig. 2) consists of a U tube con-taining the electrolyte and submersed in a jar through whichflows cold water. The bottom of the U is filled with sea sand tohinder the passage of dissolved gas from one limb of the U to theother, as suggested by Lewis, Brighton, and Sebastian.9 The cur-rent passing through the generator is regulated by means of arheostat in the circuit. During the course of the investi

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