日本金属学会誌

J. Japan Inst. Metals, Vol. 27, No. 5 (1963),
pp. 226-230

Rapid Determination of Boron in Steel by the Pyrohydrolysis and Constant Current Coulometry

Takayoshi Yoshimori1, Tomoo Miwa1 and Tsugio Takeuchi2

1Faculty of engineering, Gifu University, Gifu
2Institute of Techno-Analytical Chemistry Faculty of Engineering, Nagoya University, Nagoya

Abstract:

In this report, an accurate and simple method for the determination of boron in steel was described. The pyrohydrolytic separation method of boron was applied for the boron steel. The sample was heated in the furnace at 1350°∼ 1400°C, and aqueous vapour pre-heated at 900°C was introduced into the reaction tube at the rate of 2∼ 3.5 mL/min as the liquid water. The aqueous vapour was condensed at the end of the reaction tube, using water jacket condenser, and collected in the dilute solution of sodium hydroxide.
By the above procedure, boron in the sample was completely caught in the collect in 20∼ 40 min, and the element was determined by the constant current coulometry. The coulometric microdetermination of boron using mannitol [H. Iinuma, T. Yoshimori, H. Takeuchi: Japan Analyst, 7 (1958), 8], was satisfactory for this purpose.
Accurate results were obtained for several boron steels containing 0.0002∼ 0.01% of boron within 30∼ 50 min.


(Received 1963/2/23)

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