建立了用乙醚萃取、草酸沉淀、偶氮砷I比色测定钢中稀土总量,以及结合电解溶解试样及分离碳化物以分析钢中稀土物相的方法。对于各种离子对比色的干扰,进行了测定。此外还提出了溶样等操作中的一些注意事顶。 这个分析方法可以测定不含镍的一般合金钢中的稀土含量,分析误差<±10％。
For determining the total content of rare-earth elements in steels, a method con-sisting of extraction with ether, precipitation with oxalic acid and photometric determina-tion with arsenazo has been established. By dissolving the sample with a suitable elec-trolyte and separating the carbide involved, the phases of rare-earth elements presentedin steels may be also be determined quantitatively. The phenomenon of ionic inter-ference in the process of photometric determination has been observed, and a method toprevent it from occuring has been proposed. Furthermore, some important aspects ofoperations such as the dissolution of sample are discussed. The present method may beused to determine the content of rare-earth elements in common alloy steels not con-taining nickel, and the error is less than ±10％.
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