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Arsenic uptake, accumulation and phytofiltration by duckweed (Spirodela polyrhiza L.) 总被引:1,自引:0,他引:1
This study investigates arsenic (As) accumulation and tolerance of duckweed Spirodela polyrhiza L: and its potential for As
phytofiltration. S. polyrhiza was able to survive in high concentration of As(V) solution: The EC50 values ( SE) based on the external
As(V) were (181.66 20.12) mol/L. It accumulated (999 95) mg As/kg dw when exposed in 320 mol/L As(V) solution for one
week, and was able to take up appropriately 400 mg As/kg dw in tissues without a significant biomass loss. The EC50 values (the
e ective concentration of As(V) in the nutrient solution that caused a 50% inhibition on biomass production) was (866 68) mg/kg dw
for the tissues, indicating that S. polyrhiza had a high capability of As accumulation and tolerance. The uptake kinetic parameters Vmax
was (55.33 2.24) nmol/(g dw min) and Km was (0.144 0.011) mmol/L. Within 72 hr, S. polyrhiza decreased As concentration in
the solution from 190 to 113 ng/mL with a removal rate of 41%. The study suggested that this floating aquatic plant has some potential
for As phytofiltration in contaminated water bodies or paddy soils. 相似文献
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《中国ISO14000认证》2008,(2):F0002-F0002
2008年6月10—12日。由中华人民共和国环境保护部、财政部、联合国环境规划署、欧盟委员会联合主办的“可持续消费国际研讨会”在北京隆重举行。来自国务院相关部委、地方环保部门、中央及地方采购中心、北京奥组委、行业协会、科研院所、环境标志获证企业以及来自德国、英国、法国、瑞士、日本、韩国、菲律宾等国家环保机构、国际绿色采购网络组织等300余人参加了此次盛会。 相似文献