Radionuclides accidentally released from nuclear power plants,such as ^(137)Cs and ^(60)Co,can lead to severe contamination of marine ecosystems.Living macroalgae are effi cient in absorbing metal elements from seawat...Radionuclides accidentally released from nuclear power plants,such as ^(137)Cs and ^(60)Co,can lead to severe contamination of marine ecosystems.Living macroalgae are effi cient in absorbing metal elements from seawater.A 10-day simulation was conducted to assess the potential of scavenging cesium(Cs)and cobalt(Co)with live U lva prolifera that was cultured in seawater medium containing Cs and Co in diff erent concentrations(0(the control),10,20,50,and 100 mg/L).In the experiment,5 kg(fresh weight)of U.prolifera was cultured in natural seawater in 90-L tanks.Results showed that after the experiment,the average bioconcentration factors(BCFs)of the control group were 247.2 and 1126.4 for Cs and Co,respectively.The absolute absorption quantity of U.prolifera increased and the BCFs decreased with the increase in Cs and Co concentrations.The biosorption of the two metals on the fi rst day well fi t the pseudo-second-order equation(R^(2)>0.95),indicating that adsorption is the rate-limiting step in the total biosorption process.Concentrations of both metal ions declined signifi cantly in the fi rst hour and decreased by 25.2%and 15.5%in 48 h,respectively.Therefore,live U.prolifera is effi cient at scavenging Cs and Co in seawater,providing potential applications for the phytoremediation of radionuclides contaminated seawaters.展开更多
基金Supported by the State’s Key Project of Research and Development Plan,China(No.2016YFC1402507)the China Agriculture Research System of Ministry of Finance,and the Ministry of Agriculture(No.CARS-50)。
文摘Radionuclides accidentally released from nuclear power plants,such as ^(137)Cs and ^(60)Co,can lead to severe contamination of marine ecosystems.Living macroalgae are effi cient in absorbing metal elements from seawater.A 10-day simulation was conducted to assess the potential of scavenging cesium(Cs)and cobalt(Co)with live U lva prolifera that was cultured in seawater medium containing Cs and Co in diff erent concentrations(0(the control),10,20,50,and 100 mg/L).In the experiment,5 kg(fresh weight)of U.prolifera was cultured in natural seawater in 90-L tanks.Results showed that after the experiment,the average bioconcentration factors(BCFs)of the control group were 247.2 and 1126.4 for Cs and Co,respectively.The absolute absorption quantity of U.prolifera increased and the BCFs decreased with the increase in Cs and Co concentrations.The biosorption of the two metals on the fi rst day well fi t the pseudo-second-order equation(R^(2)>0.95),indicating that adsorption is the rate-limiting step in the total biosorption process.Concentrations of both metal ions declined signifi cantly in the fi rst hour and decreased by 25.2%and 15.5%in 48 h,respectively.Therefore,live U.prolifera is effi cient at scavenging Cs and Co in seawater,providing potential applications for the phytoremediation of radionuclides contaminated seawaters.
