The chromogenicreaction between the reagent picramazochrom and cobalt was studied.
研究了显色剂苦氨酸偶氮变色酸与钴的显色反应。
2
The synergistic chromogenicreaction of Nb(V) with both bromopyrogallol red(BPR) and diantipyrylmethane(DAM) in the presence of polyvinyl alcohol(PVA) is studied.
探讨了在聚乙烯醇（PVA）存在下，铌与溴邻苯三酚红及二安替比林甲烷的协同显色反应。
3
Such problems are discussed that low-acidity emerges in the quality analysis of hydrochloric acid and the chromogenicreaction of acidic-analysis indicator doesn′t work.