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首页> 外文期刊>Environmental toxicology and chemistry >FISH BIOTURBATION OF CADMIUM-CONTAMINATED SEDIMENTS: FACTORS AFFECTING Cd AVAILABILITY TO DAPHNIA MAGNA
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FISH BIOTURBATION OF CADMIUM-CONTAMINATED SEDIMENTS: FACTORS AFFECTING Cd AVAILABILITY TO DAPHNIA MAGNA

机译：鱼类对镉污染的沉积物的生物化作用：影响镉对大PH虫的可用性的因素

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Benthic fish bioturbation of contaminated sediments is thought to enhance exposure and, potentially, bioaccumulation into planktonic organisms. Exposures were conducted with cadmium-spiked sediment, 1.0 mg/kg nominal concentrations, and koi carp (Cyprinus carpio). Daphnia magna were placed in aquaria with and without fish for 6 d and Cd bioaccumulation was measured every 48 h. Koi carp bioturbation increased mean total suspended solids (TSS) in two trials from 0.001 mg/L 16 44.4 mg/L and 19.2 mg/L to 762.4 mg/L. Mean aqueous Cd concentrations increased from 1.4 μg/L to 2.8 μg/L, and from 1.6 μg/L to 13.2 μg/L. Cadmium binding capacity increased from 28.9 μg/L to 169.8 μg/L in with-fish treatments when compared to controls. However, Daphnia magna body burdens did not increase. Mean Cd residues of daphnids exposed with fish, 9.2 μg/g, were not statistically different from without-fish exposures, 8.0 μg/g. Body burdens slightly decreased in the first trial after the with-fish treatment, 9.4 μg/g to 8.3 μg/g. Fish size was partially correlated with TSS and aqueous Cd concentrations and TSS positively correlated with binding capacity. Because increased TSS in the with-fish treatment resulted in increased binding capacity, it is probable that cadmium bioavailability decreased. Although koi carp were capable of remobilizing Cd from sediment, Cd bioaccumulation into Daphnia magna was not significant.
机译：底栖鱼类对受污染的沉积物的生物扰动被认为可以增加接触，并可能增加浮游生物的生物积累。暴露于标称浓度为1.0 mg / kg的掺镉沉淀物和锦鲤（鲤鱼）中。将大型蚤（Daphnia magna）放在有鱼或无鱼的水族馆中6天，并每48小时测量一次镉的生物积累。两次试验中，锦鲤的生物扰动使平均总悬浮固体（TSS）从0.001 mg / L 16 44.4 mg / L和19.2 mg / L增加到762.4 mg / L。平均Cd水溶液浓度从1.4μg/ L增加到2.8μg/ L，从1.6μg/ L增加到13.2μg/ L。与对照组相比，在鱼类治疗中，镉的结合能力从28.9μg/ L增加到169.8μg/ L。但是，水蚤的身体负担并未增加。暴露于鱼类的水蚤的平均镉残留量为9.2μg/ g，与未暴露于鱼类的8.0μg/ g的差异无统计学意义。在用鱼治疗后的第一项试验中，身体负担从9.4μg/ g轻微降低至8.3μg/ g。鱼的大小与TSS和水中Cd浓度部分相关，而TSS与结合能力正相关。由于在带鱼处理中增加的TSS导致结合能力增强，因此镉的生物利用度可能降低。尽管锦鲤能够将Cd从沉积物中迁移出来，但Cd在大水蚤中的生物积累并不重要。

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