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欧盟制订新的“欧洲职业安全健康战略”
据欧洲职业安全健康局(EU-OSHA)网站消息,2012年6月28日,在哥本哈根召开的欧洲职业安全健康会议上,欧盟委员会就业社会事务和包容总司决定制订新的“欧洲职业安全健康战略”,并将于2013年进行批准实施. 相似文献
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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