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碲在某些高温合金中已成为必测元素,其含量要求小于0.0015％,为此,需要建立痕量碲的化学分析方法。在碲的各种光度测定方法中,以苯萃取碲—碘-乙基罗丹明B三元络合物法的灵敏度为最高,据介绍,在最佳条件下,摩尔吸光系数可达1.5×10~5,曾用于环保分析。本文推荐用乙酸异丁酯代替苯作为萃取剂,可避免苯对环境的污染;显色试验证明,硒对本法的干扰,加入抗坏血酸可以消除,为了自组分复杂的高温合金中分离微克量碲,试验在多种络合剂存在下用氢氧化铍共沉淀碲胁可能操,获得满意结果。据此,提出镍基、铁镍基高温合金中痕量碲的
Tellurium has become a must in some superalloys, and its content is less than 0.0015%. Therefore, it is necessary to establish a chemical analysis method of trace tellurium. In the various photometric determination of tellurium, the sensitivity of benzene extracted tellurium - iodine - ethyl rhodamine B ternary complex method for the highest, according to reports, under the best conditions, the molar absorption coefficient of up to 1.5 × 10 ~ 5, used for environmental analysis. This paper recommended the use of isobutyl acetate instead of benzene as an extractant, to avoid the pollution of benzene on the environment; color test showed that the interference of selenium law, the addition of ascorbic acid can be eliminated, in order to separate components from the complex superalloy Te , The test in the presence of a variety of complexing agent beryllium hydroxide co-precipitation of tellurium can be manipulated to obtain satisfactory results. Accordingly, the proposed nickel-based, iron-nickel-based superalloy trace tellurium