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以锑(Ⅲ)、铋(Ⅲ)或钒(Ⅴ)与磷钼酸组成的三元杂多酸,近年来广泛用于各种物料中磷的光度法测定.铌(Ⅴ)、钛(Ⅳ)、锆(Ⅳ)及钍(Ⅳ)一磷钼酸已用于光度法测定铌、钛、锆及钍,但未见用于磷的测定.本工作对磷钼锆蓝的形成条件、络合物组成及可能结构、应用于钢铁中磷的测定的可能性进行了研究.磷钼锆蓝三元杂多酸在720纳米和820纳米有两个吸收峰,ε_(820nm)=2.2×10~4升·摩尔~(-1)·厘米~(-1).可见光区测定通常用680纳米,ε_(680nm)=1.4×10~4.灵敏度比磷钼蓝法提高约一倍.在最大吸收波
In recent years, the ternary heteropolyacids composed of antimony (Ⅲ), bismuth (Ⅲ) or vanadium (Ⅴ) and phosphomolybdic acid have been widely used in the determination of phosphorus in various materials. Niobium (Ⅴ), titanium ), Zirconium (Ⅳ) and thorium (Ⅳ) -phosphomolybdic acid have been used in the determination of niobium, titanium, zirconium and thorium photometric method, but not for the determination of phosphorus. The composition and possible structure of the complexes were investigated in the determination of phosphorus in steel.Phosphomolybdosilane blue ternary heteropolyacid has two absorption peaks at 720 nm and 820 nm, ε 820 nm = 2.2 × 10 ~ 4 l · mol -1 cm -1 .The visible region is usually 680 nm, ε 680nm 1.4 × 10 -4, the sensitivity is about twice as that of the molybdenum-molybdenum blue method, Absorbed wave