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首页> 外文期刊>Environmental Science & Technology >Copper Toxicity to Larval Stages of Three Marine Invertebrates and Copper Complexation Capacity in San Diego Bay, California
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Copper Toxicity to Larval Stages of Three Marine Invertebrates and Copper Complexation Capacity in San Diego Bay, California

机译：加利福尼亚圣地亚哥湾三种海洋无脊椎动物幼体期的铜毒性和铜络合能力

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摘要

Temporal and spatial measurements of the toxicity chemical speciation, and complexation capacity (Cu-CC) of copper in waters from San Diego Bay suggest control of the Cu-CC over copper bioavailability. While spatial distributions of total copper (Cu{sub}T) indicate an increase in concentration from the mouth toward the head of San Diego Bay, the distribution of aqueous free copper ion (Cu(II){sub}(aq)) shows the opposite trend. This suggests that the bioavailability of copper to organisms decreases toward the head of the bay, and is corroborated by the increase in the amount of copper needed to reach an EC{sub}50, observed for larval stages of three marine invertebrates (Mediterranean mussel, Mytilus galloprovincialis, sand dollar, Dendraster excentricus, and purple sea urchin, Strongylo-centrotus purpuratus), and by the increase in Cu-CC heading into the head of the bay. The amount of Cu(II){sub}(aq) required to produce a 50% reduction in normal larval development (referred to here as pCu{sub}(Tox)) of the mussel, the most sensitive of the three marine invertebrates, was generally at or above ～1×10{sup}(-11) mol L{sup}(-1) equivalents of Cu (i.e., pCu{sub}(Tox) ≈11 = -(log [Cu(II){sub}(aq)])). These results suggest that the copper complexation capacity in San Diego Bay controls copper toxicity by keeping the concentration of Cu(II){sub}(aq) at nontoxic levels.
机译：时空测量的毒性化学形态以及圣地亚哥湾水中铜的络合能力（Cu-CC）表明，控制Cu-CC可以控制铜的生物利用度。尽管总铜（Cu {sub} T）的空间分布表明从嘴到圣地亚哥湾头部的浓度增加，但游离铜离子水溶液（Cu（II）{sub}（aq））的分布表明相反的趋势。这表明，铜对生物体的生物利用度向海湾顶部下降，并通过达到三种海洋无脊椎动物幼体阶段（地中海贻贝，幼体阶段）达到EC {sub} 50所需的铜量增加而得到证实。贻贝，沙钱，Dendraster excentricus和紫海胆，Strongylo-centrotus purpuratusus），并因铜-CC的增加而进入海湾。在三种海洋无脊椎动物中最敏感的贻贝的正常幼体发育（此处称为pCu {sub}（Tox））降低50％所需的Cu（II）{sub}（aq）量，通常等于或大于〜1×10 {sup}（-11）mol L {sup}（-1）当量的Cu（即pCu {sub}（Tox）≈11=-（log [Cu（II）{ sub}（aq）]）。这些结果表明，圣地亚哥湾的铜络合能力通过将Cu（II）{sub}（aq）的浓度保持在无毒水平来控制铜的毒性。

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