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金和干扰它的X射线荧光谱仪(XRF)测定的元素(Zn、Pb和As)的行为,对用磷酸三丁脂(TBP)作为固相萃取剂(SE),从盐酸、硝酸和王水中萃取进行了研究.发现从浸透过王水的矿浆中萃取金是定量选择性回收金最有利的方法,金的分布系数“D_(Au)是10~4ml/g.在从盐酸溶液中萃取金时,在研究金的整个浓度范围内(10~(-5)～10~(-4)mol),D_(Au)的值同样超过10~4.但是,随着萃取温度的增高,它将有很大的降低,从20℃的5×10~5ml/g降至70℃的9×10~3ml/g.从有氯气的盐酸萃取过程中观察到,铅有异常高的分布系数,D_(pb)=10~3ml/g.这可以用形成 Pb(N)的氯的络合物来解释.发展了一种测定天然样品中金的XRF方法.这种方法包含采用0.025mol的热硫脲溶液从SE(TBP)中反萃取金.为次级XRF提供一个薄层样品.25g的样品,测定限是10ng/g(10~(-5)%).本方法的精度用多种参考方法进行了鉴定,结果在10%的范围内一致.
Gold and interference with its XRF element (Zn, Pb and As) behavior, the use of tributyl phosphate (TBP) as a solid phase extraction agent (SE), from hydrochloric acid, nitric acid and aqua regia Extraction was studied.It was found that the extraction of gold from pulp leached through aqua regia is the most advantageous method for the quantitative and selective recovery of gold.The gold distribution coefficient "D Au (Au) is 10 ~ 4ml / g.In the extraction of gold from hydrochloric acid solution , The value of D Au also exceeded 10 ~ 4 in the whole concentration range of gold (10 ~ (-5) ~ 10 ~ (-4) mol), but with the increase of extraction temperature, Has been greatly reduced from 5 × 10 ~ 5ml / g at 20 ℃ to 9 × 10 ~ 3ml / g at 70 ℃ .It is observed from the chlorine hydrochloric acid extraction process that Pb has an unusually high distribution coefficient, D_ (pb) = 10-3 ml / g This can be explained by the formation of a complex of chlorine with Pb (N) A XRF method for the determination of gold in natural samples has been developed, which involves the use of 0.025 mol of thermal sulfur The urea solution was stripped of gold from SE (TBP). A thin layer sample was provided for the secondary XRF. The 25 g sample had a limit of determination of 10 ng / g (10 -5%). The accuracy of the method was determined using various references The method was identified and the results agreed within the 10% range.