论文部分内容阅读
在高温合金中钽含量的测定,最早所用的焦性没食子酸比色法由于同钨、钛等元素分离不够理想,因而用得不多了。但高温合金中钽含量较高(1～5%),常用的孔雀绿-苯萃取吸光光度法的测定范围在0.05%以下,且不适用于含硼的合金。铼试剂分离焦性没食子酸比色法虽较好地解决了同干扰元素的分离问题,但须使用大量的氢氟酸,操作不便,污染环境。采用氟化氢铵代替氢氟酸,操作条件有所改善,但其沉淀须经灰化、灼烧、熔融、浸取、
Determination of tantalum in the superalloy, the earliest used pyrogenic gallic acid colorimetric method due to the separation of tungsten, titanium and other elements less than ideal, and therefore not much use. However, the high tantalum content of superalloys (1 ~ 5%), commonly used malachite green - benzene extraction spectrophotometric determination of the range of less than 0.05%, and does not apply to boron-containing alloys. Although rhenium reagent separation pyrogallic acid colorimetric method better solves the problem of separation of interfering elements, it needs to use a large amount of hydrofluoric acid, which causes inconvenient operation and pollutes the environment. The use of ammonium bifluoride instead of hydrofluoric acid, operating conditions have improved, but the precipitation to be ashed, burning, melting, leaching,