钪－对氟偶氮氯膦－TritonX－100显色反应及其应用

Colour Reaction of Scandium-Chlorophosphonazo-pF Triton X-100 and Its Application

当ＴｒｉｔｏｎＸ－１００存在时，Ｓｃ与对氟偶氮氯膦（ＣＰＡ－ｐＦ）在常温下反应形成ｐ型络合物，表现摩尔吸光系数为６．Ｉ×Ｉ０￣４Ｌ·ｍｏｌ￣－１·ｃｍ￣－１，ＴｒｉｔｏｎＸ－１００可提高络合物的稳定性使之至少稳定２４ｈ，Ｓｃ（Ⅲ）浓度在０．０～０．μｇ／ｍｌ符合比尔定律。方法可用于合金中痕量Ｓｃ的测定。

he colour reaction of Sc-CPA-pF-Triton X- 1 00 has been investigated.The beta-typecornplex is formed at room temperature.The apparent molar absorptivity is 6.1×10￣4L·mol￣-1·cm￣-1 at 740 nm.The cornplex is stable for 24 h in the presence of Triton X-100.Beer's law isobeyed over the range of 0.0～0.4 μg/ml Sc(Ⅲ).The method has been used in the directdetermination of trace Sc in allovs.