论文部分内容阅读
钨在高温合金、高速工具钢中一般含量较高,且与钼、钒、铬、钛、铌共存、测定高含量钨的方法以比色法最为简便,但缺乏不经分离解决共存元素干扰的方法。对苯二酚法需在浓硫酸介质中测定,操作不便;钨蓝法,当钼含量高时有干扰;硫氰酸盐法最常用,选择性重现性均好,然而克分子吸收系数低,钒含量高时需校正,为克服钒钼干扰,可用氯化四苯基胂萃取法,但操作麻烦;有人建议用邻苯二酚紫测定高合金钢中的钨,因
Tungsten is generally high in superalloy and high-speed tool steels and coexists with molybdenum, vanadium, chromium, titanium and niobium. The method for the determination of high tungsten content is the simplest method for colorimetric determination but lacks the interference of coexisting elements without separation method. The hydroquinone method requires determination in concentrated sulfuric acid medium with inconvenient operation; the tungsten blue method has interference when the molybdenum content is high; the most common and selective reproducibility of thiocyanate method is good; however, the molecular absorption coefficient is low , To be corrected when the vanadium content is high, in order to overcome the interference of vanadium and molybdenum, tetraphenylarsine chloride extraction method can be used, but the operation is cumbersome; it is suggested that the determination of tungsten in high alloy steel with catechin violet