鉴于新技术和新兴技术使用的微量元素提取增加,监测水环境中这些化合物的环境命运和潜在影响从未如此重要。这里,在一个关键的前哨捕食者中评估了肝脏微量元素浓度,普通海豚(Delphinusdelphis),使用长期数据集。与其他元素相关的浓度变化进行了评估,时间段,分解状态,性别,年龄,身体总长度,性成熟和营养状况,和死因。此外,评估风险的汞毒性阈值被审查和采用.生物累积元素的浓度,THg,MeHg,Cd,还有Pb,除了Se和V,与年龄密切相关,和/或身体长度。锌浓度与疾病状态之间存在关联,在死于传染病的个体中测得的浓度明显更高,与其他原因相比。检测到强烈的元素间关系,即在Hg和Se之间,甲基汞和硒,Cd和Se,以及Cu和Zn。虽然观察到THg:Se摩尔比值随年龄和体长而增加,接近等调。THg主要由老年人的无机汞组成,可能与Se绑定,因此,THg毒性的影响可能不如最初假设的重要。相比之下,据报道,青少年的MeHg:Hg比值较高,表明去甲基化效率较差,灵敏度较高。关于肝脏甲基汞和无机汞比例的数据的产生对于污染物指标评估中的未来毒性阈值评估都具有重要意义。并了解海洋网络中汞的最终命运。
Given the increased extraction of trace elements for use by new and emerging technologies, monitoring the environmental fate and potential effects of these compounds within the aquatic environment has never been more critical. Here, hepatic trace element concentrations were assessed in a key sentinel predator, the common
dolphin (Delphinus delphis), using a long-term dataset. Variation in concentrations were assessed in relation to other elements, time period, decomposition state, sex, age, total body length, sexual maturity and nutritional status, and cause of death. Additionally, mercury toxicity thresholds for evaluating risk were reviewed and employed. Concentrations of elements which bioaccumulate, THg, MeHg, Cd, and Pb, in addition to Se and V, were strongly correlated with age, and/or body length. An association was observed between Zn concentrations and disease status, with significantly higher concentrations measured in individuals that died from infectious disease, compared to other causes. Strong inter-elemental relationships were detected, namely between Hg and Se, MeHg and Se, Cd and Se, and Cu and Zn. While THg:Se molar ratio values were observed to increase with age and body length, approaching equimolarity. THg was largely comprised of inorganic Hg in older individuals, potentially bound to Se, therefore the effects from THg toxicity may possibly be less important than originally assumed. In contrast, higher MeHg:Hg ratio values were reported in juveniles, suggesting a poorer efficiency in demethylation and a higher sensitivity. The generation of data on proportions of hepatic MeHg and inorganic Hg is highly informative to both future toxicity threshold assessments within pollutant indicator assessments, and to understanding the ultimate fate of mercury in the marine web.