两地土壤中的钚含量及同位素组成分析  

Determination of the Concentration and Isotopic Composition of Plutonium in Soil

作　　者：金玉仁[1] 张利兴[1] 周国庆[1] 王旭辉[1] 夏兵[1] 朱凤蓉[1] 章连众[2] 韩世钧[2] 

机构地区：[1]西北核技术研究所,西安710024 [2]浙江大学化学系,杭州310027

出　　处：《分析化学》2004年第10期1321-1324,共4页Chinese Journal of Analytical Chemistry

摘　　要：采用三正辛胺 (TNOA)萃取色层和同位素稀释法 ,ICP MS测量了我国西北地区土壤中痕量Pu。实验结果表明 ,本流程Pu的本底为 (0 .0 36± 0 .0 2 5 )× 10 -12 g ,相应的定量限为 0 .2 5× 10 -12 g。实验测得甘肃某地及陕西西安地区土壤样品中的2 3 9Pu含量分别低于 1.0× 10 -12 和 0 .2× 10 -12 ;2 40 Pu/ 2 3 9Pu的同位素丰度比分别为 0 .15和 0 .18。该丰度比结果说明西安地区的Pu来自全球沉降 ,而甘肃地区的Pu则还另有来源。Plutonium in soil was separated using tri-octylamine extraction chromatography and measured by inductively coupled plasma mass spectrometry ( ICP-MS). The background of Pu-239 for the procedure was 0.036 +/- 0.025 pg, and the detection limit was 0.25 pg accordingly. The concentrations of Pu-239 are presented to be 0.2 pg/g and 1 pg/g in Xian and Gansu, respectively. Plutonium isotopic ratio, Pu-240 to Pu-239, was also obtained for 0. 18 at Van and 0. 15 at Gansu, respectively. These results show that the plutonium source in Van is derived from global fallout, beside it other plutonium source existed in Gansu.

关 键 词：土壤 钚 含量测定 同位素组成分析 电感耦合等离子体质谱 三正辛胺 环境监测 

分 类 号：X833[环境科学与工程—环境工程]