REMOVAL AND TRANSFORMATION OF TRI-BUTYLTIN IN SEAWATER BY THREE MARINE MICRO-ALGAE
几种海洋微藻对水中三丁基锡化合物的迁移和转化作用

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.