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。
The process of Acid Red 2GL is mainly introduced in this paper, and the conditions of both diazo-couple reaction and complexation reactions are also discussed.
本文主要论述了中性红2GL染料的合成工艺路线，并对重氮偶合反应和络合反应条件进行了讨论。
This was a five -step process involving: diazo coupling reaction, chloridization, condensation, hydrolysis, condensation respectively.
这是一个五步反应，包括重氮化偶合反应、氯置换反应、缩合反应、水解反应、缩合反应。
DBNCPA of asymmetry acid bis-diazo reagent have the color reaction with the metal palladium, but have not obvious color reaction with other five kind of metal elements of the platiniridium.
作为不对称变色酸双偶氮试剂的二溴硝基偶氮氯膦与金属钯可发生显色反应，而与同属铂系元素的其他五种金属的显色反应并不明显；
Poly (N-vinyl carbazole) was modified to prepare azo-PVK by post-azo-coupling reaction with diazo salt as raw material using phase-transfer catalysts.
我们以聚乙烯咔唑为偶合组分，和发色基团对硝基苯重氮盐在相转移催化剂存在下，采用后重氮偶合方法，制备出偶氮化聚乙烯咔唑。
Poly (N-vinyl carbazole) was modified to prepare azo-PVK by post-azo-coupling reaction with diazo salt as raw material using phase-transfer catalysts.
我们以聚乙烯咔唑为偶合组分，和发色基团对硝基苯重氮盐在相转移催化剂存在下，采用后重氮偶合方法，制备出偶氮化聚乙烯咔唑。
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