日本金属学会誌

J. Japan Inst. Metals, Vol. 16, No. 3 (1952),
pp. 173-176

Determination of Sodium and Lithium in Welding Flux for Aluminum Alloys

Tsunenobu Shigematsu, Hirozo Kimura and Masao Yasumaru


Abstract:

A new differential method for analysis of sodium and lithium in welding flux for aluminum alloys has been developed. Generally, welding flux for aluminum alloys contains sodium, lithium and potassium as chloride and fluoride. When sodium was determined gravimetrically,precipitating as triple salt by a nickel-uranyl-acetate or zinc-uranyl-acetate reagent, lithium and potassium was coprecipitated, and the results obtained were found to be of too high value. The magnecium-uranyl-acetate reagent was less sensitive to lithium and potassium, and by the choice of suitable conditions, sodium was precipitated without coprecipitation of lithium and potassium. The zinc-uranyl-acetate-(lithium) reagent was less sensitive to potassium than the nickel-uranyl-acetate reagent. By using the zinc-uranyl-acetate-(lithium) reagent, sodium and lithium were precipitated as triple acetate,without any interference of potassium. Consequently,the amount of lithium was given by the difference of the two results.


(Received 1951/10/16)

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