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痕量稀土元素的分光光度测定,几年来已有报导:偶氮胂Ⅲ、双羧基偶氮氯膦Ⅲ、偶氮胂 M、偶氮氯膦Ⅲ等。但这些稀土元素的显色剂,对测定铝合金等复杂基体中稀土元素,需预先分离,操作麻烦,也不易掌握。最近华东师大合成了稀土新显色剂偶氮氯膦mA,已成功应用于球墨铸铁和低合金钢中稀土元素直接测定。本文利用偶氮氯膦 mA 进进了大量条件试验,应用草酸、EDTA、硫脲等掩蔽锆、钛、铝、铁、镍、铬、铜的干扰,成功地测定铝合金、铜合金、镍合金中铈。
Spectrophotometric determination of trace rare earth elements, has been reported over the years: arsenazo Ⅲ, biscarboxylazophosphine Ⅲ, arsenazo M, chlorophosphonazo Ⅲ and so on. However, these rare earth elements of the developer, the determination of rare earth elements such as aluminum alloy complex matrix, need to be separated in advance, the operation is cumbersome, it is not easy to grasp. Recently, East China Normal University synthesized a rare earth new reagent chlorophosphonazo mA, has been successfully used in ductile iron and low alloy steel in the direct determination of rare earth elements. In this paper, chlorophosphonazo mA has been used in a large number of conditions, and the interference of zirconium, titanium, aluminum, iron, nickel, chromium and copper by oxalic acid, EDTA and thiourea has been investigated. In Ce.