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钢中钒的含量通常比铬低,钒当量为铬的3倍。因此,容量法测钒时指示剂校正比测铬重要。试验证明:影响氧化还原指示剂苯基邻氨基苯甲酸校正值的主要因素是氧化剂种类、存在量、指示剂与氧化剂接触时间及温度。并提出,在亚砷酸存在下,滴加高锰酸钾能选择性地氧化钒(Ⅳ).从而找到了测钒时消除指示剂校正及铈干扰的办法。因而降低了钒的测定下限,提高了准确度。一指示剂校正值的来源及影响因素1 指示剂校正值的来源:二苯胺类衍生物是还原剂,在指示氧化还原终点的过程中,存在着不可逆的氧化还原过程,要消耗氧化剂。此外,过量的氧化剂
Vanadium content of steel is usually lower than chromium, vanadium equivalent chromium 3 times. Therefore, the volume method of measuring vanadium indicator correction than measuring chromium is important. The experiment proves that the main factors that affect the correction value of phenyl anthranilate of redox indicator are the type of oxidant, the existence amount, the contact time and temperature of indicator and oxidant. It was also proposed that potassium permanganate can be selectively oxidized to vanadium (IV) in the presence of arsenious acid, thereby finding a way to eliminate indicator correction and cerium interference when measuring vanadium. Thus reducing the lower limit of determination of vanadium, improve the accuracy. Source of an indicator correction value and influencing factors 1 Source of indicator correction value: Diphenylamine derivatives are reducing agents, there is an irreversible redox process in the process of indicating the redox end point, and the oxidizer is consumed. In addition, excess oxidant