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~(226)Ra为极毒亲骨性放射性核素,在环境和食品卫生中是一项重要的测试项目。本文对~(226)Ra的分析测定方法作了改进,采用钡铅双载体硫酸盐沉淀,放宽了对pH值的控制,并省去冰醋酸除铅,取得了较好的效果。 1).实验步骤 准确称取样品,加两倍于样品重的过氧化钠、半倍于样品重的氢氧化钠于50ml镍坩埚内,搅匀,上面再盖一层过氧化钠。置650～700℃的马弗炉内熔融6～7分钟。待熔融物冷却结壳后置于盛有250ml热水的500ml烧杯内脱壳水浸。洗出坩埚后,往溶液中加1:1硝酸80ml,溶解沉淀,滴入少量双
~ (226) Ra is a very toxic pro-bone radionuclide and is an important test item in environment and food hygiene. In this paper, the analytical method of ~ (226) Ra has been improved. The barium-lead binary carrier sulfate precipitation has been adopted to relax the control of pH value and eliminate glacial acetic acid to remove lead, which has achieved good results. 1). Experimental Procedure Weigh the sample accurately, add twice as much sodium peroxide as the sample weight, and half the weight of the sample sodium hydroxide in a 50ml nickel crucible. Stir well and cover with a layer of sodium peroxide. Set 650 ~ 700 ℃ muffle furnace melting 6 to 7 minutes. After the melt cooled crust placed in 500ml beaker filled with 250ml hot water immersion shelled. After washing out the crucible, add 1: 1 nitric acid to the solution 80ml, dissolve the precipitate, dropping a small amount of double