铬天青 S 被广泛用于分光光度法测定包括铀酰离子在内的多价离子。根据实验条件的不同,铬天青 S 与铀酰离子反应而形成单核和双核络合物。在含有过量铀(Ⅵ)的溶液中,在 pH 4时,在等克分子溶液中,pH4.8时,都形成单核络合物(1:1,λ最大592—595nm,ε=15.8×10~4lmol~(-1)cm~(-1)),而在有点类似的条件下,在 pH3或 pH 低于3时,生成双核络合物。在 Chromium Azure S is widely used for the spectrophotometric determination of multivalent ions including uranyl ions. Depending on the experimental conditions, chrome azure S reacts with uranyl ions to form mononuclear and dinuclear complexes. Mononuclear complexes (1: 1, λ max 592-595 nm, ε = 15.8 × l) were formed in a solution containing an excess of uranium (Ⅵ) at pH 4 in an equimolar solution at pH 4.8 10 ~ 4lmol -1 cm -1), while under similar conditions, a binuclear complex was formed at pH 3 or below pH 3. in