Mercury bioavailability was assessed by exposing the dipteran Chironomus riparius for the whole life cycle to legacy-contaminated fluvial sediments (0.038–0.285 mg Hg kg⁻¹ d.w.) and analyzing tissue concentrations in larvae at different exposure times (7, 11, and 16 days) and in adults. In the same experiment, diffusive gradients in thin-film passive samplers (DGTs), both piston- and probe-shaped, were co-deployed in the same sediments and retrieved at the same times as the organisms. To compare the two approaches, results showed a good agreement between accumulation kinetics of C. riparius and DGTs, both approximating an apparent steady-state. A strong correlation was found between values in tissues and in both types of DGTs (r between 0.74 and 0.99). Concentrations in mature larvae (19–140 µg kg⁻¹ w.w.), which may represent a basal level of the aquatic food web, exceeded the European Environmental Quality Standard for biota (20 µg kg⁻¹ w.w.), which aims at protecting the top predators from secondary poisoning. Body burdens in larvae and in adults were similar, showing negligible decontamination during metamorphosis and proving an efficient mercury transfer from sediments to terrestrial food webs.

中文翻译：

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膜沉积物和扩散梯度在薄膜（DGT）中估算的河流沉积物中的汞生物利用度

汞的生物利用度是由暴露双翅目评估摇riparius整个生命周期中遗留污染的河流沉积物（0.038-0.285毫克汞千克^-1在不同的曝光时间（7,11在幼虫DW）和分析组织浓度，16天）和成人。在同一实验中，活塞形和探针形的薄膜无源采样器（DGT）中的扩散梯度被共同部署在相同的沉积物中，并在与生物体相同的时间被回收。为了比较这两种方法，结果表明河滨梭菌的蓄积动力学具有良好的一致性。和DGT都近似于稳态。在组织中和两种类型的DGT中的值之间都发现了很强的相关性（r在0.74和0.99之间）。成熟幼虫（19–140 µg kg ^-1 ww）的浓度（可能代表水生食物网的基础水平）超过了欧洲生物群环境质量标准（20 µg kg ^-1 ww），该标准旨在保护顶部捕食者免于二次中毒。幼虫和成虫的身体负担相似，在变态过程中显示的去污作用可忽略不计，并证明了汞从沉积物到陆地食物网的有效转移。