钚在放射性污染区沙漠植物中的含量  

Concentration of Plutonium in Desert Plants From Contaminated Area

作　　者：徐辉[1] 金玉仁[1] 田梅[1] 李伟平[1] 王耀芹[1,2] 王煜[1,2] 曾可[1] 

机构地区：[1]西北核技术研究所,陕西西安710024 [2]兰州大学核科学与技术学院,甘肃兰州730000

出　　处：《原子能科学技术》2012年第5期524-529,共6页Atomic Energy Science and Technology

摘　　要：研究沙漠植物中钚的含量,对于评估沙漠植物受钚污染状况,寻找钚指示和超积累植物有重要意义。本文采集某放射性污染区内的植物并分析其中239 Pu的含量,获得7种沙漠植物受239 Pu污染的数据,据此分析影响植物体内核素含量的因素。所研究沙漠植物体内239 Pu含量平均值为(1.8±4.9)Bq/kg(干重),明显受到钚的污染。再悬浮是造成植物表面污染严重的重要因素之一。植物体内钚的含量与植物种类、生长期、地表污染程度等密切相关。所研究沙漠植物中钚含量的大小顺序为:河西苣>芦苇>盐穗木>盐生草>黑果枸杞>刚毛柽柳>沙拐枣,其中草本植物中钚的含量均大于木本植物。The investigation of plutonium in desert plants from contaminated sites contributes to the evaluation of its pollution situation and to the survey of plutonium hyperaccumulator.The concentration of 239Pu in desert plants collected from a contaminated site was determined,and the influence factors were studied.The concentration of 239Pu in plants was（1.8±4.9） Bq/kg in dry weight,and it means that the plants were contaminated,moreover,the resuspension results in dramatic plutonium pollution of plant surface.The concentration of plutonium in plants depends on species,live stages and the content of plutonium in the rhizosphere soil.The concentration of plutonium in herbage is higher than that in woody plant,and for the seven species of desert plants investigated,it decreases in the order of Hexinia polydichotoma,Phragmites australis,Halostashys caspica,Halogeton arachnoideus,Lycium ruthenicum,Tamarix hispida and Calligonum aphyllum.

关 键 词：钚 放射性污染 沙漠植物 超积累植物 

分 类 号：X508[环境科学与工程—环境工程]