A new spectrophotometric method for the determination of trace nitrite was studied. The method is based on the diazo - reaction of methylene violet with nitrite in hydrochloric acid medium.

研究了在盐酸介质中微量亚硝酸根与亚甲紫发生的重氮化反应，建立了测定微量亚硝酸根的新方法。

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The article attempted to research into the conditions and affecting factors concerning the determination of Arsanilic acid by way of ultra-violet spectrophotometry.

本文对阿散酸的紫外分光光度的吸收光谱曲线、测定条件及影响因素进行了探讨。

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This paper chose some kinds of carboxylic acid as the solvent and a series of crystal violet-boric acid reversible thermochromic paints were prepared by solid phase synthesis method.

选用羧酸类溶剂，采用固相法合成了结晶紫-硼酸系列可逆热致变色材料。

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