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铌—水杨基萤光酮—溴化十六烷基吡啶络合物，在０．１２～０．３２ｍｏｌ／Ｌ硫酸介质中，最大吸收波长为５２０ｎｍ，摩尔吸光系数为１．３×１０－５，稳定时间为２ｈ。在硫脲存在下，络合物可稳定２０ｈ不变。五氧化二铌含量在０～５μｇ／２５ｍＬ内，符合比尔定
Niobium-salicylfluorone-cetylpyridinium bromide complex has a maximum absorption wavelength of 520 nm and a molar absorptivity of 1.3 × 10 -5 in a 0.12-0.32 mol / L sulfuric acid medium, The stability time is 2h. In the presence of thiourea, the complex can be stable for 20h. Niobium pentoxide content in 0 ~ 5μg / 25mL, in line with the Biliding