CESIUM-137 IN PERCH IN SWEDISH LAKES AFTER CHERNOBYL - PRESENT SITUATION, RELATIONSHIPS AND TRENDS
CESIUM-137 IN PERCH IN SWEDISH LAKES AFTER CHERNOBYL - PRESENT SITUATION, RELATIONSHIPS AND TRENDS
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DOI：
10.1016/0269-7491(89)90064-x
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发表时间：
1989-01-01
影响因子：
8.9
通讯作者：
NILSSON, A
中科院分区：
文献类型：
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作者：
HAKANSON, L;ANDERSSON, T;NILSSON, A
切尔诺贝利事故和瑞典水系统的普遍酸化，构成了这个项目的基础。这项工作的目的是提出关于鱼体内铯-137浓度、湖泊碳负荷和湖泊特征之间联系的结果，对恢复情况作出初步预测，并将结果置于更广泛的环境危害分析框架内。1986年和1987年期间收集了41个湖泊的湖泊学、形态测量学和流域条件的广泛数据。在1 +鲈鱼（Cs-pe， 1岁鲈鱼）、水中、沉积物捕集器收集的物质和表层沉积物中测定Cs-137。主要结果如下：2年间，所有湖泊的Cs-pe平均值从9800 Bq kg-1（湿）下降到5040。一般来说，下降幅度在5%到90%之间。我们已经测试了是否有任何因素可能与这种下降有特别的联系——没有发现这样的因素。沉积物中碳的浓度平均下降了80%。沉积物圈闭测定的铯-pe与铯负荷之间存在非常高的相关性。在1 - 10%之间(平均3。1986年6月至8月期间，有9%的初始沉降物从陆地转移到水中。初始沉降物沉积的变化解释了65-69%的Cs-pe变异；如果同时考虑湖水硬度和totP，解释度（=决定系数，r2）提高到85%左右。该地图显示了可能有1 +鲈鱼的湖泊区域，其平均cs浓度高于1500 Bq kg-1湿。瑞典有4000至7000个湖泊的Cs-pe含量似乎高于1500 Bq kg-1，这些数字强调了切尔诺贝利事故对瑞典环境状况的严重影响。
The Chernobyl accident, and the general acidification of Swedish water systems, form the base for this project. The aims of the work have been to present results on the linkage between the concentration of Cs-137 in fish, lake load of Cs and lake characteristics, to give a preliminary prognosis on the recovery, and to put the results within a wider framework of environmental hazard analysis. A broad set of of data on limnology, morphometry and drainage area conditions from 41 lakes were collected during 1986 and 1987. Cs-137 was determined in 1 + perch (Cs-pe, 1-year-old perch), water, material collected by sediment traps and from surficial sediments. The main results are as follows. The average value of Cs-pe for all lakes has dropped from 9800 Bq kg-1 (wet) to 5040 between the 2 years. Generally, the decrease is between 5 and 90%. We have tested if any factor(s) could be specifically linked to this decrease-no such factors have been found. The concentrations of Cs in sediment traps have, on average, decreased by 80%. Very high correlations exist between Cs-pe and the caesium load as determined from the sediment traps. Between 1 and 10% (mean 3 .cntdot. 9%) of the initial fall-out deposition to the drainage area was transported from land to water during June to August 1986. The variation in initial fall-out deposition explains 65-69% of the variability in Cs-pe; the degree of explanation (= coefficient of determination, r2) increases to about 85% if one also takes into account the lake water hardness and totP. A map showing areas with lakes likely to have 1 + perch with higher mean Cs-concentrations than 1500 Bq kg-1 wet is presented. Between 4000 and 7000 lakes in Sweden appear to have Cs-pe higher than 1500 Bq kg-1 wet, figures which emphasize the serious impact of the Chernobyl accident on the environmental conditions in Sweden.