Hg^(2+)胁迫下细叶蜈蚣草对水体总磷去除效果的研究  

Effects of Hg^(2+)on Removal Rate of TP in Water by Egeria najas

作　　者：沈盎绿[1] 沈新强[1] 邵留[2] 姚维志[2] 

机构地区：[1]中国水产科学研究院东海水产研究所农业部海洋与河口渔业重点开放实验室,上海200090 [2]西南农业大学水产学院,重庆400716

出　　处：《农业环境科学学报》2005年第z1期130-133,共4页Journal of Agro-Environment Science

基　　金：重庆市科委应用基础项目资助(200217)

摘　　要：采用室内培养分析测试方法,研究了在不同梯度浓度的Hg2+处理下,细叶蜈蚣草对水体总磷去除效果的动态变化情况。结果表明:对照组和Hg2+浓度为0.10 mg.L-1试验组在Hg2+处理的96 h内,细叶蜈蚣草对水体总磷去除率随着处理时间的延长而增加;0.50 mg.L-1和1.00 mg.L-1试验组在48 h内,细叶蜈蚣草对水体中总磷去除率一直上升,但96 h后对水体中总磷的去除率明显下降;Hg2+浓度大于1.50 mg.L-1的试验组中细叶蜈蚣草对水体中总磷去除率一直下降。同时,细叶蜈蚣草对水体总磷去除率的均值与Hg2+浓度亦均呈曲线关系,细叶蜈蚣草对水体总磷去除速率的均值与Hg2+浓度均呈曲线关系。The removal rates of TP in Water by Egeria najas under the stress of different concentrations of Hg^(2+)were studied.The removal rates of TP by Egeria najas increased in the controlled group and the group with 0.10 mg.L^(-1) Hg^(2+) after exposure of 96h;they also increased in the groups of 0.50 mg.L^(-1) and 1.00 mg.L^(-1) Hg^(2+) in 48 h,but declined after 48 h;when the concentration of Hg^(2+) was above 1.00 mg.L^(-1),the removal rates of TP declined all the time.The regression relationship between the average removal rate of TP by Egeria najas(y)and the concentrations of Hg^(2+)(x) were:y_(24)= 3.3204x^(2)-28.244x + 18.559,r^(2) being 0.9921;y_(48)= 6.8501x^(2)-44.775x + 27.865,r^(2) being 0.9518;y_(96)= 13.398x^(2)-73.379x+(30.406),r^(2)being 0.9823.The relationship between the average removal velocities of TP by Egeria najas(y)and the concentrations of Hg^(2+)(x) were:y_(24)= 0.0207x^(2)-0.1706x + 0.1295,r^(2)being 0.9946;y_(48)= 0.0203x^(2)-0.1323x + 0.0933,r^(2) being(0.9749);y_(96)= 0.0195x^(2)-0.1072x + 0.0518,r^(2) being 0.9591.

关 键 词：细叶蜈蚣草 汞 总磷 去除效果 

分 类 号：X503.233[环境科学与工程—环境工程]