在0.1—0.2N硫酸介质中,6价铬与二苯卡巴肼形成稳定的紫红色铬合物,于最大吸收550nm波长处比色测定是一个很成熟的方法,但用于钛合金中铬的测定时,由于钒、钼、铁等共存元素的干扰,须用铜铁试剂进行沉淀分离,使操作手续繁琐,准确度较差。本法经条件试验确定,于波长580nm处测定,此时基体钛、1％钒、1％钼、0.5％铁及2％锰等共存元素均不干扰铬的测定,可不用任何分离手续直接测定钛合金中的铬。又由于减少了硝酸银用量,可免除过滤 In 0.1-0.2N sulfuric acid medium, hexavalent chromium and diphenylcarbazide form a stable fuchsine complex, which is a very mature method for the colorimetric determination at a wavelength of maximum 550 nm absorption, but it is a very mature method for the determination of chromium in titanium alloys Determination, due to the interference of vanadium, molybdenum, iron and other coexisting elements, the need to use copper and iron reagent precipitation separation, so that the tedious procedures, the accuracy is poor. The law determined by the conditions, measured at a wavelength of 580nm, this time base titanium, 1% vanadium, 1% molybdenum, 0.5% iron and 2% manganese and other coexisting elements do not interfere with the determination of chromium, without any direct determination of separation procedures Titanium in titanium. And because of reducing the amount of silver nitrate, can be removed from filtration