两种温度处理下铜绿微囊藻对Cr^(6+)的耐受与吸附特性研究

Study on the Endurance Effect and Sorption Characteristic of Microcystis aeruginosa on Cr^(6+) at Two Temperatures

在20℃和30℃两个温度条件下研究了铜绿微囊藻(Microcystis aeruginosa)对Cr^(6+)的耐受性和吸附率.结果表明:随着Cr^(6+)质量浓度的增加,24h后其对铜绿微囊藻的生长速率及叶绿素a的生物合成抑制作用增强,而胞外多糖的生物合成显著地增加.30℃时胞外多糖的生物合成量显著高于20℃胞外多糖含量(P<0.05).Cr^(6+)质量浓度增加至0.6mg/L时,铜绿微囊藻对Cr^(6+)吸附率最大,20℃和30℃时分别达到84.7%和98.3%.Cr^(6+)质量浓度为9.0mg/L时,单位藻生物量对Cr^(6+)的吸附量达到最大,20℃和30℃时最大吸附量分别为39.3g/g、58.6g/g.

The present study investigated the tolerance of Microcystis aeruginosa PCC7806（Ma 7806）to Cr^（6＋）at 20 ℃ and 30 ℃,and measured the removal efficiency of Cr^（6＋）by Ma 7806.The results showed that with increasing the concentration of Cr^（6＋）,the inhibition on the growth rate and chlorophyll a（Chl a）biosynthesis of Ma 7806 became stronger,but the biosynthesis of extracellular polysaccharide significantly increased.The biological synthesis content of extracellular polysaccharide at 30℃ was significantly more than that at 20℃（P〈0.05）.The removal efficiency of Cr^（6＋）by Ma 7806 reached the maximum when the concentration of Cr^（6＋）reached 0.6mg/L,namely 84.7% at 20 ℃,98.3% at 30 ℃,respectively.The adsorption capacity of Cr^（6＋）by Ma 7806 reached the maximum when the concentration of Cr^（6＋）reached 9.0 mg/L,and the maximum adsorption capacity were 39.3g/g at 20 ℃,58.6g/g at 30 ℃,respectively.