(1中国农科院农业资源与区划研究所 农业部植物营养与养分循环重点实验室 北京 100081)
(2中国科学院南京土壤研究所 土壤与农业可持续发展国家重点实验室 南京 210008)
(3Division of Land & Water, CSIRO, PMB 2 Glen Osmond, 5064, Australia)4. CSIRO Land and Water
Application of 65Cu Dilution Techniques for Assessing L and E-Values for Cu in Long-term Biosolid Applied Soils
Chen Shibao1,2 Ma Yibing*,1,3 Enzo Lombi3 Mike J. McLaughlin3
(1 Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling, and Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081)
(2 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008)
(3 Division of Land & Water, CSIRO, PMB 2 Glen Osmond, 5064, Australia)
The accurate assessment of bioavailability for copper in biosolids after its long-term application in soil is one of the key questions regarding its eco-environmental risk assessment and modifying of current soil environmental quality threshold. A procedure for determining L and E-values of Cu using 65Cu isotopic dilution technology has been successfully developed and applied using rye grass and earthworms, the effect of pH on the L and E-values of Cu in the soils was also investigated in this study. The results indicated that the L-values determined with rye grass were nearly equal to E-values measured in soils and a good convergence of L- and E-values was observed (regression R2＝0.98), the percentage of L-values determined with ryegrass plants of different pH treatments ranged from 15.9% to 21.6% and the measured L and E-values of Cu increased with the decreasing pH in soils|however, the L-values determined with earthworms were generally less than the E-values measured in the soils and the earthworms gut which indicating that the activities of worms increase the exchangeable pool of Cu in soil. The strong influence of soil pH on Cu bioavailability and toxicity found in this study indicated that control of soil pH is a critical factor in minimising the environmental risk of Cu from soil to food chain and ecosystem health.
陈世宝, 马义兵, Enzo, Lombi, Mike, J. McLaughlin. 利用稳定性65Cu稀释技术测定长期施用有机肥土壤中不同pH条件下铜的E-值及L-值[J]. 化学学报, 2011, 69(04): 459-465.
CHEN Shi-Bao, MA Yi-Bing, Enzo , Lombi , Mike , J. McLaughlin. Application of 65Cu Dilution Techniques for Assessing L and E-Values for Cu in Long-term Biosolid Applied Soils. Acta Chimica Sinica, 2011, 69(04): 459-465.