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钨的三元混配络合物有W-H_2O_2-Morin及W-H_2O_2-PV。虽然利用这两种体系可在大量钼的存在下测定钨,但灵敏度低。利用钨的离子缔合物时,有的灵敏度虽很高,但须用萃取法。自1973年以来,钨的胶束增溶光度研究得较多,方法的灵敏度也较高,但ε可达10~5级的体系为数不多,而且选择性一般都较低。资料已证明,溴化的2,3,7-及3,4,5-三羟基萤光酮与相应未溴化的试剂相比较,由于溴吸电子基团的引入,使共轭体系中
Tungsten ternary complexes with W-H_2O_2-Morin and W-H_2O_2-PV. Although both systems can be used to determine tungsten in the presence of large amounts of molybdenum, the sensitivity is low. When using the ion association of tungsten, although some high sensitivity, but the need to use extraction. Since 1973, the solubilization of tungsten micelles has been more studied, the sensitivity of the method is also higher, but the system of ε up to 10 to 5 of the few, and the selectivity is generally low. It has been shown that compared to the corresponding unbrominated reagents, the brominated 2,3,7- and 3,4,5-trihydroxyfluorescein halides, due to the introduction of bromine electron withdrawing groups,