State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
Sci Total Environ. 2014 Sep 1;491-492:266-70. doi: 10.1016/j.scitotenv.2014.02.028. Epub 2014 Feb 23.
The effects of acute toxicity, 3-day population growth and morphological effects of perfluorinated carboxylic acids (PFCAs) with carbon chain lengths of 2-6 on the freshwater rotifer Brachionus calyciflorus were investigated. The results indicated that the 24-h median lethal concentration (LC50) values of trifluoroacetic acid (TFA), perfluoropropionic acid (PFPrA), perfluorobutanoic acid (PFBA), perfluopentanoic acid (PFPeA), and perfluorohexanoic acid (PFHxA) towards B. calyciflorus were 70, 80, 110, 130 and 140 mg L(-1), respectively. The acute effects of PFCAs decreased with the increase of carbon chain length. The parameters used to determine 3-day population growth on these compounds were the rate of population increase (r) and mictic ratio. With the increase of fluorinated carbon-chain length, the r values of TFA, PFPrA, PFBA, PFPeA and PFHxA decreased by 0.99%, 16.8%, 16.5%, 22.4% and 32.0%, respectively. Mictic ratios ranged from 0.707 to 0.953 for PFCAs with carbon chain lengths of 2-6. In addition, the mictic ratio, body size and egg size exposed to some PFCAs were higher than those of the controls. These results offer a useful method for the ecological risk assessment of these short chain PFCAs.
研究了碳链长度为 2-6 的全氟羧酸（PFCAs）对淡水轮虫褶皱臂尾轮虫的急性毒性、3 天种群增长和形态影响。结果表明，三氟乙酸（TFA）、全氟丙基酸（PFPrA）、全氟丁酸（PFBA）、全氟戊酸（PFPeA）和全氟己酸（PFHxA）对 B. calyciflorus 的 24 小时半数致死浓度（LC50）值分别为 70、80、110、130 和 140mg/L。PFCAs 的急性影响随碳链长度的增加而降低。用于确定这些化合物 3 天种群增长的参数是种群增长率（r）和减数分裂比。随着全氟碳链长度的增加，TFA、PFPrA、PFBA、PFPeA 和 PFHxA 的 r 值分别降低了 0.99%、16.8%、16.5%、22.4%和 32.0%。碳链长度为 2-6 的 PFCAs 的减数分裂比范围为 0.707-0.953。此外，暴露于某些 PFCAs 的减数分裂比、体型和卵大小均高于对照组。这些结果为这些短链 PFCAs 的生态风险评估提供了一种有用的方法。
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