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目前测定钢中钨的光度法,应用较广的有对苯二酚法,硫氰酸盐法和硫氰酸盐-氯化四苯钟-氯仿萃取法。硫氰酸盐直接光度法中,钼的含量大于1.5%时干扰钨的测定;硫氰酸盐-氯化四苯鉮-氯仿萃取法中,在50mg铁存在下,钼的最大允许量只达3%;对苯二酚法钼不干扰,但铌、钛有干扰,校正曲线稳定性较差,使用大量浓硫酸,对试剂配制和操作极为不便.钨蓝法现已用于大部分钢种钨的炉前分析,但对含钼量较高的钢种,由于钼的严重干扰,使吸光度明显上涨或减退,而且由于介质酸度和光度计波长的改变,校正系数也发生变化,因此,用校正系数扣除钼
The current determination of tungsten in steel spectrophotometry, the wider use of hydroquinone, thiocyanate and thiocyanate - chlorinated tetracene - chloroform extraction. Thiocyanate direct spectrophotometric method, the determination of tungsten interference when the content of molybdenum is more than 1.5%; thiocyanate - tetraphenylstilium chloride - chloroform extraction method, in the presence of 50mg of iron, the maximum allowable amount of molybdenum only reached 3%; hydroquinone method does not interfere with molybdenum, but niobium, titanium interference, the stability of the calibration curve is poor, the use of a large number of concentrated sulfuric acid, reagent preparation and operation is extremely inconvenient. Tungsten blue method has been used for most of the steel However, for the steel with higher molybdenum content, the absorbance obviously increases or decreases due to the serious interference of molybdenum, and the correction coefficient also changes due to the change of medium acidity and photometer wavelength. Therefore, The correction factor deduct molybdenum