三正辛胺纤维棉对金的吸附性能及其在测定金中的应用

Study on Absorptive Characteristics of Trioctylamine Cotton Cellulose for Gold and Its Application

研制了三正辛胺（ＴＯＡ）纤维棉，考察了ＴＯＡ纤维棉对Ａｕ（Ⅲ）的吸附性能，选择了吸附和解吸的最佳条件。在φ＝１０％的王水中，ＴＯＡ纤维棉可定量吸附Ａｕ（Ⅲ），使其与多种共存离子分离。吸附的Ａｕ（Ⅲ）用１０ｇ／Ｌ的Ｎａ２ＳＯ３溶液解脱。在给定条件下，对５～２００μｇＡｕ（Ⅲ）进行分离富集，其回收率在９８０％～１０１０％。方法已用于氧化金铅矿、铅锌矿、银金矿中金的分离富集和测定，所得结果与其它方法相符，其ＲＳＤ（ｎ＝５）为１６％～３９％。

In this work, trioctylamine cotton cellulose was prepared and its absorptive characteristics for gold (Ⅲ) and the optimum condition for adsorption and desorption of gold (Ⅲ) were studied. In the medium of 10% aqua regia, Au(Ⅲ) was absorbed quantitatively by trioctylamine cotton cellulose and separated from coexistent ions. Au(Ⅲ) was then desorbed by 10 g/L Na 2SO 3 solution. Under the optimized condition, the recoveries for 5?200 μg Au (Ⅲ) were 98.0%?101.0% with precision of 1.6%?3.9% RSD( n =5). The method has been applied to the determination of Au in some gold containing ores and the results are in good agreement with those by other methods.