阴离子交换树脂分离—盐酸底液方波极谱法测定铜矿石中铅  

ANION EXCHANGE RESIN SEPARATION DETERMINATION OF LEAD IN COPPER ORES WITH SQUARE-WAVE POLAROGRAPHIC METHOD IN SUPPORTING ELECTROLYTE OF HYDROCHLORIC ACID

作　　者：李纹浪 

机构地区：[1]辽宁省地质实验研究所

出　　处：《国土资源》1990年第1期87-94,共8页Land & Resources

摘　　要：利用铅离子在稀氢溴酸—溴化钾介质中能形成稳定络阴离子的特性,本文研究了应用717强碱性阴离子交换树脂分离大量铜等干扰元素、富集铅的最佳条件。试样经酸溶、预分离富集后,用方波极谱法在2mol/l HCl—1.25%VC 底液中测定铅。峰电位为-0.46V(对银片电极)。方法的检出限为0.98μg/g,测定限为1.96μg/g,相列标准偏差 R·S·D=8.7%,回收率在97%—110%之间。该方法分离干扰元素效果好,操作简便、快速,适用于铜矿石中2μg/g 以上铅的测定。也可用于岩石及其他矿物等复杂样品中微量铅的测定。This paper studied the best cnditin to separate some interference elements,copper for example,with 717 strong basic anion exchange resin,and to concentrate lead by the feature which lead ion could form stable complex anion in dilute hydrobromic acid-potassium bromide medium. Dissolved by acid,the sample was separated and concentrated,then lead was determined in 2 mol/l HCl—1.25% VC supporting electrolyte with square-wave polarographic method.The peak potential was-0.46V(VS Ag electrode),the detection limit was 0.98μg/g,the determination limit was 1.96μg/g,the relative standard deviation R·S·D=8.7% and the rate of recovery within 97% to 110%. This method is of great efficiency,can obtain satisfactory results,and may be applied to determining lead above 2 μg/g in copper ores,or trace lead in complex samples of rocks and other minerals.

关 键 词：阴离子交换树脂分离 稀氢溴酸—溴化钾介质 铜矿石 铅 方波极谱法 

分 类 号：P[天文地球]