英语语法分析

The synergistic chromogenic reaction 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。