方波伏安法同时测定U_3O_8中的铅和铁  

SIMULTANEOUS DETERMINATION OF LEAD AND IRON IN TRIURANIUM OCTOXIDE BY SQUARE WAVE VOLTAMMETRY

作　　者：封国宁[1] 李铁球[1] 陈红波 

机构地区：[1]核工业总公司第六研究所

出　　处：《原子能科学技术》1989年第4期29-33,共5页Atomic Energy Science and Technology

摘　　要：U_3O_8样品用HNO_3溶解,用TBP-CCl_4溶液萃取以分离铀,水相用HClO_4蒸干,残渣溶于0.05mol/l的HClO_4和0.03mol/l的酒石酸混合底液中,用方波阳极伏安法测定铅,峰电位为-0.376 V,然后加入氨水使溶液pH约为9.5,用方波阴极伏安法测定铁,峰电位为-1.426V。方法的准确度和精密度都较好。The U_3O_8 sample is dissolved in nitric acid and uranium is removed by ex-traction with TBP-carbon tetrachloride three times. The aqueous solution is evapo-rated to dryness with perchloric acid and the residue is dissolved in 5 ml mixturecontaining 0.05 mol/l perchloric acid and 0.03 mol/l tartaric acid. The Pb isdetermined by square wave anodic stripping voltammetry in the range -0.5～0.15 V (vs. S. C. E.) with a peak potential at -0.376 V. The solution isfurther treated with ammonium hydroxid to make the pH about 9.5. The Fe isdetermined by square wave cathodic voltammetry in the range -1.30～-1. 65 Vwith a peak potential at -1. 426V. Simultaneous determination of 1-0. 01ppm ofthe above elements are possible.

关 键 词：方波伏安法 U3O8 铅 铁 分离 测定 

分 类 号：TL271[核科学技术—核燃料循环与材料]