硫丹对萼花臂尾轮虫的急性毒性及生物累积

Acute toxicity and bioaccumulation of endosulfan in rotifer (Brachionus calyciflorus).

Fernández-Casalderrey A, Ferrando M D, Gamón M, Andreu-Moliner E

Department of Animal Physiology, Faculty of Biological Sciences, University of Valencia, Spain.

Comp Biochem Physiol C Comp Pharmacol Toxicol. 1991;100(1-2):61-3. doi: 10.1016/0742-8413(91)90123-b.

Abstract

The acute toxicity of endosulfan was determined for the freshwater rotifer Brachionus calyciflorus. 2. The mean 24 hr LC50 value for endosulfan was 5.15 ppm with a coefficient of variation of 14.7%. 3. Rotifers were exposed at two sublethal concentrations (1.5-2.0 ppm) of endosulfan for bioaccumulation experiments, for an exposure time of 24, 48, 72 and 96 hr. The rotifers were fed with Nannochloris oculata (5 x 10(5) cell/ml). 4. The highest accumulation of endosulfan was found 24 hr after the start of the exposure to 1.5 ppm of the toxicant. A steady-state concentration in rotifer was reached between 24-48 hr, followed by a gradual decrease until 96 hr.

摘要

测定了硫丹对淡水轮虫萼花臂尾轮虫的急性毒性。2. 硫丹的24小时平均半数致死浓度（LC50）值为5.15 ppm，变异系数为14.7%。3. 将轮虫暴露于硫丹的两个亚致死浓度（1.5 - 2.0 ppm）下进行生物累积实验，暴露时间为24、48、72和96小时。轮虫投喂眼点拟微绿球藻（5×10⁵ 个细胞/毫升）。4. 在开始暴露于1.5 ppm的毒物后24小时发现硫丹的累积量最高。轮虫体内在24 - 48小时达到稳态浓度，随后逐渐下降直至96小时。