Mechanisms of Ni, Cu, Zn, Pb, Cd, As and Se retention in Finnish peat bogs, and the chronology of their accumulation from natural and anthropogenic sources

我们建议建立高分辨率的记录大气沉积的痕量金属（镍、铜、锌、铅、镉）和非金属（砷和硒）使用从芬兰沼泽收集的泥炭芯：Outokumpu和Harjavalta受到金属开采和精炼的大气排放的影响，而Alkkia的泥炭沼泽在1962年接受了Ni，Cu和Zn盐的实验性添加;相比之下，Hietajärvi远离工业活动。将使用14 C（使用AMS测量的大气炸弹脉冲曲线）确定过去50年泥炭积累的年表。通过比较泥炭芯中保存的金属积累的年表与金属排放的历史记录，泥炭剖面内元素的迁移率将被量化。更深的，前人类活动的泥炭层（几千年），将提供“自然背景”的通量为这一地区，与现代通量进行比较。将进行固相和水相中的金属的分馏，以确定各种可能的金属保留机制的相对重要性：植物吸收和掺入生物分子，有机络合或金属硫化物形成。

We propose to construct high resolution records of atmospheric deposition of trace metals (Ni, Cu, Zn, Pb, Cd) and non-metals (As and Se) using peat cores collected from Finnish bogs: Outokumpu and Harjavalta have been impacted by atmospheric emissions from metal mining and refining, whereas the peat bog at Alkkia has received experimental addition of Ni, Cu, and Zn salts in 1962; for comparison, Hietajärvi is remote from industrial activity. The chronology of peat accumulation during the past 50 years will be determined using 14C (atmospheric bomb pulse curve measured using AMS). By comparing the chronology of metal accumulation preserved in the peat cores with the historical records of metal emissions, the mobilities of the elements within the peat profiles will be quantified. Deeper, pre-anthropogenic peat layers (several thousand years old), will provide the "natural background" fluxes for this region, for comparison with modern fluxes. Fractionation of the metals in both the solid and aqueous phases will be undertaken to determine the relative importance of various possible metal retention mechanisms: uptake by plants and incorporation into biomolecules, organic complexation, or metal sulphide formation.