【摘要】 目的探讨重金属镉（Cd）在有抑藻剂亚麻酸存在时对浮游藻类的生物有效性。方法分别用不同浓度Cd²⁺（0.10、0.20、0.30和0.40 mg/L）单独以及与亚麻酸（0.01 mL/L）组合对斜生栅藻（Scenedesmus obliquus）和铜绿微囊藻（Microcystis aeruginosa）进行处理,测定不同处理条件对斜生栅藻和铜绿微囊藻的抑制作用以及对藻细胞吸附和吸收镉离子作用的影响。结果单独镉和单独亚麻酸在各实验浓度下对铜绿微囊藻和斜生栅藻均有一定抑制作用,对铜绿微囊藻的抑制作用更强,0.10和0.40 mg/L Cd²⁺在第96 h对铜绿微囊藻的抑制率分别达到42.17%和67.42%,单独0.01 mL/L亚麻酸在第96 h对铜绿微囊藻的抑制率为39.33%,但当与镉复合存在时,对铜绿微囊藻和斜生栅藻的抑制效应均没有显著性改变。有亚麻酸存在时,斜生栅藻与铜绿微囊藻对镉的吸收及吸附量均显著性减少（P<0.05）。结论脂肪酸的羧基可能对镉离子有轻度螯合作用,从而降低了重金属镉的毒性,也减少了镉被藻细胞的吸附或吸收。更多还原

【Abstract】 Objective To investigate the bioavailability of heavy metal cadmium on planktonic algae under the condition of containing linolenic acid.Methods Using different concentrations of Cd²⁺（ 0.10,0.20,0.30 and 0.40 mg/L） alone,as well as different combinations of cadmium with 0.01 mL/L linolenic acid that acted on Scenedesmus obliquus and Microcystis aeruginosa respectively,then the growth-inhibitory of S.obliquus and M.aeruginosa and the absorption of cadmium and adsorption of cadmium by S.obliquus and M.aeruginosa were detected.Results Both cadmium alone and linolenic acid alone had certain inhibitory effects on M.aeruginosa and S.obliquus at the concentrations,and the inhibition was stronger on M.aeruginosa.The inhibition rates reached 42.17% and 67.42% of 0.10 and 0.40 mg/L Cd²⁺ at the 96 h,the inhibition rate of 0.01 mL/L linolenic acid at the 96 h was 39.33%,there were no changes with the inhibitory effects when linolenic acid and cadmium coexisted.But both the cadmium uptake and adsorption amount by M.aeruginosa and S.obliquus all decreased under the condition of containing linolenic acid（ P < 0.05）.Conclusion The fatty acid carboxyl may have mild chelation to cadmium ions,which can reduce the heavy metal cadmium toxicity,and also reduce the uptake or absorption of cadmium by algae cells.更多还原