几种海洋微藻对水中三丁基锡化合物的迁移和转化作用

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单室生物积累模型描述，根据模型曲线拟合求出其总吸收饱和浓度和生物排出速常数，微藻对三丁基锡的生物富集因子高达１０＾４－１０＾５，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。

REMOVAL AND TRANSFORMATION OF TRI-BUTYLTIN IN SEAWATER BY THREE MARINE MICRO-ALGAE

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 × 10⁴.5 × 10⁵)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.