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用光度法测定岩石、矿物中的硒(Ⅳ)时,对其伴生元素的分离多采用沉淀法富集硒(Ⅳ),但流程繁琐;而离子交换、色层、薄层等又多局限于纯物质试验;用萃取法分离岩石、矿物中硒(Ⅳ)的报道少见。为了寻求一个简便快速的分离方法,我们通过实验发现:在一定浓度的磷酸-氢溴酸介质中,甲苯能选择地定量萃取硒(Ⅳ)(一次萃取率达95％以上),萃取硒(Ⅳ)后的水相用醋酸异戊酯定量地同时萃取铊(Ⅲ)和铟(Ⅲ),再用水对醋酸异戊酯进行反萃取,则铟(Ⅲ)进入水相,铊(Ⅲ)留在有机相中。达到了硒(Ⅳ)、铊(Ⅲ)、铟(Ⅲ)的相互分
When selenium (Ⅳ) in rocks and minerals is determined by spectrophotometry, selenium (Ⅳ) is mostly used for the separation of its associated elements by precipitation method, but the procedure is cumbersome. However, ion exchange, color layers and thin layers are mostly limited to Pure material test; Separation of rocks by extraction, selenium (Ⅳ) minerals reported rare. In order to find a simple and rapid separation method, we found through experiments that toluene can selectively extract selenium (Ⅳ) in a certain concentration of phosphoric acid - hydrobromic acid medium (the extraction rate is more than 95% ) After simultaneous extraction of thallium (III) and indium (III) with isopentyl acetate in aqueous phase followed by stripping of isoamyl acetate with water, indium (III) enters the aqueous phase and thallium (III) remains In the organic phase. Reached selenium (Ⅳ), thallium (Ⅲ), indium (Ⅲ) mutual points