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首页> 外文期刊>Environmental toxicology and chemistry >TOXICITY TO MELITA PLUMULOSA FROM INTERMITTENT AND CONTINUOUS EXPOSURES TO DISSOLVED COPPER
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TOXICITY TO MELITA PLUMULOSA FROM INTERMITTENT AND CONTINUOUS EXPOSURES TO DISSOLVED COPPER

机译：间歇性和连续暴露对溶解的铜对TO的毒性

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摘要

The concentrations of metal contaminants often fluctuate in estuarine waters; yet we have limited knowledge about the effects of intermittent exposures on estuarine organisms. Using 10-d lethality bioassays with the epibenthic amphipod Melita plumulosa, different combinations of intermittent (pulsed) dissolved Cu exposure were investigated, varying Cu concentration, pulse duration, and time between pulses. Negligible organism mortality was observed immediately after single 12- to 62-h duration pulsed exposures of 100 to 900 μg/L dissolved Cu. However, delayed mortality was observed in the subsequent 96-h nonexposure period, after which negligible additional mortality occurred during the remainder of the 240-h tests. For multiple pulsed exposures, increasing the time between pulses from 0 to 144 h did not result in significantly different mortality rates for 300 and 400 μg/L dissolved copper, indicating that the organisms did not recover between pulses. Organism mortality exhibited a strong relationship with the time-averaged concentration (TAC) resulting from the combination of exposure concentration and duration. The lethal concentration to 50 (LC50), 20 (LC20), and 10% (LC10) (95% confidence interval) of the test population for the combined TAC exposure-survival data were 86 (71-103), 44 (30-64), and 30 (18-49) μg Cu/L, respectively, which were similar to the respective values of 100 (87-114), 55 (43-70), and 39 (28-54) μg Cu/L determined for continuous exposure. The results from the current study support the use of analytical techniques capable of determining the time-averaged concentration of metals, because they will more accurately predict the effects of toxiciants on organisms than single time-point measurements.
机译：河口水域中金属污染物的浓度经常波动。但是，我们对间歇性暴露对河口生物的影响的认识有限。使用带有表皮的两栖动物Melita plumulosa的10天致死性生物测定法，研究了间歇性（脉冲）溶解性铜暴露的不同组合，改变了铜的浓度，脉冲持续时间和脉冲之间的时间。在100至900μg/ L的溶解性铜单次持续12至62 h脉冲暴露后，立即观察到可忽略的生物死亡。但是，在随后的96小时非暴露期中观察到延迟的死亡率，此后在240小时试验的其余时间内发生的附加死亡率可忽略不计。对于多次脉冲暴露，将脉冲之间的时间从0增加到144 h不会导致300和400μg/ L溶解铜的死亡率显着不同，这表明生物体在脉冲之间没有恢复。有机物死亡率与暴露浓度和持续时间相结合而产生的时间平均浓度（TAC）密切相关。对于合并的TAC暴露-生存数据，测试人群的致死浓度分别为50（LC50），20（LC20）和10％（LC10）（95％置信区间），分别为86（71-103），44（30- 64）和30（18-49）μgCu / L，分别类似于100（87-114），55（43-70）和39（28-54）μgCu / L的值确定连续曝光。当前研究的结果支持使用能够确定时间平均金属浓度的分析技术，因为与单一时间点测量相比，它们将更准确地预测有毒物质对生物的影响。

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  • 来源
    《Environmental toxicology and chemistry》 |2010年第12期|p.2823-2830|共8页
  • 作者

    Brad M. Angel; Stuart L. Simpson; Dianne F. Jolley;

  • 作者单位

    Commonwealth Scientific and Industrial Research Organisation Land and Water, Centre for Environmental Contaminants Research, Kirrawee,New South Wales 2232, Australia,School of Chemistry, University of Wollongong, New South Wales 2522, Australia;

    Commonwealth Scientific and Industrial Research Organisation Land and Water, Centre for Environmental Contaminants Research, Kirrawee,New South Wales 2232, Australia;

    School of Chemistry, University of Wollongong, New South Wales 2522, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    pulsed exposures; amphipod; dissolved copper; toxicity; time-averaged concentration;

    机译：脉冲曝光;两栖动物溶解铜毒性;时间平均浓度;

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