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一、引言随着有机试剂的发展,比色测定铬的方法愈来愈多.铬的显色反应大体可分为两类:一类是铬(Ⅵ)氧化有机试剂而显色.此类试剂较少,主要有我们所熟知的二苯基碳酰二肼.另一类是铬(Ⅲ)与有机试剂生成有色络合物.这类试剂较多,特别是近一、二十年来研究得较多,如甲基百里酚兰、甘氨酸甲酚红、偶氮胂M、偶氮胂Ⅲ等.其中,偶氮胂Ⅲ地
I. INTRODUCTION With the development of organic reagents, more and more methods for the colorimetric determination of chromium have been developed.Color reaction of chromium can be divided into two categories: one is the chromogenic (VI) oxidation of organic reagent and the other is the development of such reagents Less, mainly we have known diphenylcarbodihydrazide the other is chromium (Ⅲ) and organic reagents to generate colored complexs.This kind of reagent more, especially in the past one or two decades has been studied More, such as methyl thymol blue, glycine cresyl red, arsenazo M, arsenazo Ⅲ etc. Among them, arsenazo Ⅲ to