有机锡对海洋微藻的生理效应　Ⅰ.三苯基锡和三丁基锡对光合色素含量的影响

THE PHYSIOLOGICAL EFFECTS OF ORGANOTIN ON MARINE MICROALGAE Ⅰ. EFFECTS OF ORGANOTIN ON PHOTOSYNTHETIC PIGMENTS OF TWO MARINE PHYTOPLANKTON

于1991年4月－1992年五月，以金藻和扁藻为材料，用室内一次培养法研究三苯基锡（TPTC）和三丁基锡（TBTC）化合物对光合色素含量的影响。结果表明，两种有机锡对两种藻均有影响，在0．2—0．4μg／L的浓度时有轻微毒性；浓度大于0．5μg／L时，能使光合色素明显减少。对于两种藻叶绿素a72hEC50影响结果：TBTC和TPTC对金藻的均为0．59μg／L；对扁藻的，TBTC是0．87μg／L，而TPTC本出现半效应浓度。对于两种藻的类胡萝卜素72hEC50影响结果：金藻，TPTC是0．57μg／L，TBTC是0．49μg／L；扁藻，TBTC是0．89μg／L，TPTC也未出现半效应浓度。认为，两种有机锡对光合色素有明显的破坏作用。

Effects or organotin compounds, triphenyltin chloride(TPTC) and tributyltinchloride(TBTC), on photosynthetic pigments (chlorophyll a, chlorophyll b, chloro-phyll c and carotenoids) of pure cultures of two microalgae, Dicrateria zhanjiangen-sis and Platymonas sp., were tested from April, 1991 to January. 1992. The twospecies were from our departmental microalgae culture lab and batch culture was used.The results indicated that photosynthetic pigments of the two species were reducedmarkedly after 24h exposure to 0.5μg/L TBTC and TPTC. The 72h Chl. a EC50 ofTBTC and TPTC were both about O.59μg/L and the 72h carotenoids EC50 were 0.49and 0.57μg/L respectively for D. zkanjiangensis. The 72h Chl. a EC50 and 72h caro-tenoids EC50 of TBTC were 0.87 and 0.89μg/L respectively for Platymonat sp.. BothChl. a and carotenoids of Platymonas sp. were not reduced by TPTC to below 50%of that of the control; TBTC had more reducing effect than TPTC on photosynthe-tic pigments; Platymonas sp. could tolerate greater concentration of organotin thanD. zhanjiangensis.