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偶氮氯膦Ⅲ(ChlorophsphonazoⅢ)(C. P. Ⅲ)为稀土元素的显色剂之一。今村介召了稀土元素的克分子吸光系数(λ_(max)=665nm)为(2.15～4.3)×10~4l·mol~(-1)·cm~(-1)。武汉大学报告了重稀土的克分子吸光系数为(5.4～7.4)×10~4l·mol.(-1)·cm~(-1)。竹田津指出,偶氮氯膦Ⅲ与輕重稀土的显色反应有所不同,在一定条件下,重稀土的絡合物可由α型轉变成β型。我們研究了在乙醇——水介質中形成RE—C.P.Ⅲ絡合物的适宜条件,得出稀土克分子吸光系数(λ_(max)=675nm)为(1.26～1.59)×10~5l·mol~(-1)·cm~(-1),是文献值的2～3倍。
Chlorophosphonazo Ⅲ (C, P. Ⅲ) is one of the rare earth element chromogenic agents. Imamura called for the molar absorptivity (λ max = 665 nm) of rare earth elements to be (2.15 ~ 4.3) × 10 ~ 4l · mol -1 (-1) cm -1. Wuhan University reported the molecular absorption coefficient of heavy rare earth (5.4 ~ 7.4) × 10 ~ 4l · mol. (-1) · cm ~ (-1). Takeda Tsu pointed out that the color reaction of chlorophosphonazo III with light and heavy rare earths is different, under certain conditions, heavy rare earth complexes can be converted from α-type β-type. We studied the suitable conditions for the formation of RE-CPIII complex in ethanol-water medium. The results showed that the molecular absorption coefficient of rare earth (λ max = 675 nm) was 1.26-1.59 × 10-5l · mol ~ (-1) · cm ~ (-1), which is 2 ~ 3 times of the literature value.