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目前,水相溶液中光度法测定含高铌镍基高温合金中微量钽还是比较困难,其主要原因是已报道的显色剂对铌钛等有严重干扰。碱性染料如结晶紫等虽然灵敏度高,但用苯萃取,而且硼有干扰。5-Br-PADAP作为钽的显色剂已有报道,在硫酸介质中显色干扰元素较多,尤其铌钛镍等干扰严重,因此用以测定高温合金中微量钽必须预先进行分离。通常的分离方法如离子交换法,纸上色谱法及高分子胺萃取法等均不理想。沈志洪等以氯化四苯鉮为沉淀剂系统地研究了铌钽分离体系,在含有少量氟化物的稀王水介质
At present, the determination of trace amounts of tantalum in high-niobium-based superalloys by photometric method in aqueous solution is still rather difficult. The main reason is that the reported color reagent has serious interference with niobium and titanium. Although the basic dyes such as crystal violet and other high sensitivity, but benzene extraction, and boron interference. 5-Br-PADAP as a tantalum developer has been reported in the sulfuric acid medium more interference elements, especially niobium titanium nickel and other serious interference, and therefore to determine the high-temperature alloy trace tantalum must be separated in advance. The usual separation methods such as ion exchange, paper chromatography and polymer amine extraction are not ideal. Shen Zhihong and other tetraphenyl chloride as a precipitant system for the study of niobium and tantalum separation system, containing a small amount of fluoride in dilute Wang aqueous medium