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首页> 外文期刊>Marine Chemistry >Atmospheric trace metal concentrations, solubility and deposition fluxes in remote marine air over the south-east Atlantic
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Atmospheric trace metal concentrations, solubility and deposition fluxes in remote marine air over the south-east Atlantic

机译：东南大西洋上空的海洋空气中的大气痕量金属浓度，溶解度和沉积通量

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摘要

Total and soluble trace metal concentrations were determined in atmospheric aerosol and rainwater samples collected during seven cruises in the south-east Atlantic. Back trajectories indicated that the samples all represented remote marine air masses, consistent with climatological expectations. Aerosol trace metal loadings were similar to previous measurements in clean, marine air masses. Median total Fe, Al, Mn, V, Co and Zn concentrations were 206, 346, 5, 3, 0.7 and 11 pmol m(-3) respectively. Solubility was operationally defined as the fraction extractable using a pH 4.7 ammonium acetate leach. Median soluble Fe, Al, Mn, V, Co, Zn, Cu, Ni, Cd and Pb concentrations were 6, 55, 1, 0.7, 0.06, 24, 2, 1, 0.05 and 0.3 pmol m(-3) respectively. Large ranges in fractional solubility were observed for all elements except Co; median solubility values for Fe, Al and Mn were below 20% while the median for Zn was 74%. Volume weighted mean rainwater concentrations were 704, 792, 32, 10, 3, 686, 25, 0.02, 03 and 10 nmol L-1 for Fe, Al, Mn, V, Co, Zn, Cu, Ni, Cd and Pb respectively (n = 6). Wet deposition fluxes calculated from these values suggest that rain makes a significant contribution to total deposition in the study area for all elements except perhaps Ni. (C) 2015 The Authors. Published by Elsevier B.V.
机译：确定了在东南大西洋的7次航行中收集的大气气溶胶和雨水样本中的总和可溶性痕量金属浓度。回溯轨迹表明，这些样品均代表了遥远的海洋气团，符合气候预期。气溶胶中痕量金属的含量与以前在清洁的海洋气团中的测量值相似。 Fe，Al，Mn，V，Co和Zn的总中位数浓度分别为206、346、5、3、0.7和11 pmol m（-3）。溶解度在操作上定义为可使用pH 4.7醋酸铵浸提法提取的馏分。可溶性Fe，Al，Mn，V，Co，Zn，Cu，Ni，Cd和Pb的中位数浓度分别为6、55、1、0.7、0.06、24、2、1、0.05和0.3 pmol m（-3）。对于除Co外的所有元素，观察到较大的分数溶解度范围； Fe，Al和Mn的中值溶解度值低于20％，而Zn的中值溶解度值为74％。 Fe，Al，Mn，V，Co，Zn，Cu，Ni，Cd和Pb的体积加权平均雨水浓度分别为704、792、32、10、3、686、25、0.02、03和10 nmol L-1 （n = 6）。根据这些值计算得出的湿沉降通量表明，降雨可能对研究区域内除镍以外的所有元素的总沉积产生了重大影响。 （C）2015作者。由Elsevier B.V.发布

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