Potential influence of ocean acidification on deep-sea Fe-Mn nodules and pelagic clays: an improved assessment by using artificial seawater
Potential influence of ocean acidification on deep-sea Fe-Mn nodules and pelagic clays: an improved assessment by using artificial seawater
复制标题
海洋酸化对深海铁锰结核和远洋粘土的潜在影响：使用人工海水的改进评估
DOI：
10.1007/s10498-018-9345-y
复制
发表时间：
2018
影响因子：
1.6
通讯作者：
A.
中科院分区：
文献类型：
--
作者：
Wang;Q.;Kawahata;H.;Yamaoka;K.;Suzuki;A.
为了评估深海沉积物中金属随海水pH下降而释放的潜在风险，研究了铁锰结核和远洋粘土中元素的活动性。利用CO2诱导的pH调节系统，将两个地球化学标准样品(JMN-1和JMS-2)与pH控制的人工海水(ASW)反应。我们的实验表明，深海沉积物通过金属氧化物/羟基氧化物和硅酸盐矿物表面羟基的酸碱解离，具有较弱的缓冲能力。ASW中的元素浓度主要受固相元素形态和带电固体表面与离子物种之间的吸附-脱附反应控制。这些结果表明，在评价海洋酸化对深海环境的影响时，应考虑Mn、Cu、Zn和Cd等重金属的释放。
In order to assess the potential risk of metal release from deep-sea sediments in response to pH decrease in seawater, the mobility of elements from ferromanganese (Fe–Mn) nodules and pelagic clays was examined. Two geochemical reference samples (JMn-1 and JMS-2) were reacted with the pH-controlled artificial seawater (ASW) using a CO2-induced pH regulation system. Our experiments demonstrated that deep-sea sediments have weak buffer capacities by acid–base dissociation of surface hydroxyl groups on metal oxides/oxyhydroxides and silicate minerals. Element concentrations in the ASW were mainly controlled by elemental speciation in the solid phase and sorption–desorption reaction between the charged solid surface and ion species in the ASW. These results indicated that the release of heavy metals such as Mn, Cu, Zn and Cd should be taken into consideration when assessing the influence of ocean acidification on deep-sea environment.