Liming as a method to remedy lakes contaminated by radiostrontium.
This work has identified the characteristics regulating lake sensitivity to 90Sr-contamination and why certain lakes are likely to respond positively to lake liming (Ca-treatment) and when this would not be a feasible or economic remedial measure to lower 90Sr-levels in fish. The results demonstrate that liming would work best in (1) small, (2) low-productive, (3) oligohumic, (4) acid lakes with (5) low initial Ca-concentrations. It is important to start the liming as soon as possible after the fallout. The liming model discussed in this work can be used to calculate the changes in lake Ca-concentrations and the duration of the liming. The Sr-model can be used to calculate changes in Sr-levels in water, sediments and fish. At best, these simulations indicate that it is realistic to expect that lake liming can reduce peak levels of 90Sr in fish by 25-40%.
Håkanson
Lars
L
Institute of Earth Sciences, Uppsala University, Villav. 16, 752 36 Uppsala, Sweden. lars.hakanson@natgeog.uu.se
D000818:Animals; D017610:Calcium Compounds / Q000737:chemistry*; D017753:Ecosystem; D005399:Fishes; D010087:Oxides / Q000737:chemistry*; D011847:Radioactive Fallout; D013326:Strontium Radioisotopes / Q000737:chemistry; D014875:Water Pollutants, Radioactive / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
D017610:Calcium Compounds; D010087:Oxides; D011847:Radioactive Fallout; D013326:Strontium Radioisotopes; D014875:Water Pollutants, Radioactive; C016538:lime