摘要
实验表明，在半抑制效应浓度下纤弱角毛藻、扁藻、三角褐指藻对三丁基锡均有瞬时强吸附作用。其后，微藻对三丁基锡的吸收可用单室生物积累模型描述，根据模型和曲线拟合求出其总吸收饱和浓度和生物排出速率常数．微藻对三丁基锡的生物富集因子高达１０￣４一１０￣５，主要取决于高比表面、高分配比和高摄取速率，７２ｈ纤弱角毛藻对三丁基锡的生物降解率在５％左右．
Avery strongadsorption of tri-butyltin in its half inhibition concentra- tion by marine micro-algae occurred rapidly during the batch culture expe- riments of Chaetaceros gracillis, Platymonas sp.and Pkaccdactylum tricorau- tum,After then the uptake of the organic tin by the three algae can be approximated with the single compartment model of biological accumulation,and through curve fitting the maximum uptake concentration of the organic tin by alga cells(6.54ug/g(Chaetaccros gracill),6.21u/g(Platymunas sp,28.1ug/g(Phaecdactylum tricornutum))and the biological depuration rate con- stant(0.0998h￣(-1),0.118h￣(-1),and 0.0802h￣(-1),respectively)can be estimated.The very high bioaccumulation factors(BCF)of the three algae(0.6 × 10￣4.5 × 10￣5)are due to their high surface area,high octanol-water portition coefficient,and high uptake rate in comparison with other marine organisms. The degra- dation rate of tributyltin to lnono-and di-butyltin by algae being about 5% within 72 hours was also observed for Chactaceros gracillis.
出处
《环境科学学报》
CAS
CSSCI
CSCD
北大核心
1994年第3期341-348,共8页
Acta Scientiae Circumstantiae
基金
国家自然科学基金
关键词
海洋微藻
三丁基锡
生物迁移
生物转化
marine micro-algae,tri-butyltin,biological removal,bio- logical transformation,BCF.
