<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class="">Dear all,</div><div class=""><br class=""></div><span class="">the Friday seminar series continues this Friday (7 April) at 12:30 in the seminar room on the 3rd floor with a presentation given by:<br class=""><br class=""><span class=""><b class="">Tobias Linke </b></span></span><span class=""><b class="">"</b></span><span class=""><b class="">Iron minerals in peat areas of Iceland: modelling, phase transformation and environmental impact"</b><br class=""></span><span class="" style="text-align: justify;"><br class=""></span></div><div class=""><div class="">
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<!--StartFragment--><p class="BodyText1"><span lang="EN-GB" class="">Peat lands cover
huge areas in the sub-arctic and store vast amounts of organic carbon. Their
soil waters are reduced and rich in dissolved carbon, metals and nutrients.
Peat lands buffer natural floods as well as metal- and nutrient-fluxes to the
oceans. These fluxes are affected by climate change and man-made drainage
channels. Here we propose to define the <i class="">in
situ </i>mineralogy and soil water composition in Icelandic peat, under
variable dust fluxes, and their evolution along oxidation, pH and salinity gradients.
The dust is mostly basaltic glass, which is the main source of metals, and
tends to increase the pH of the soil solutions when it dissolves.<o:p class=""></o:p></span></p><p class="BodyText1"><span lang="EN-GB" class="">The PHREEQC program
was used with the MINTEQ.V4 database and additional thermodynamic data on green
rust phases to model the stability fields of iron-containing minerals and
aqueous species as a function of pH and Eh. The stability fields were
constrained by measured compositions of peat solutions and the observation that
the formation of hematite and magnetite rarely occur in these waters.
Furthermore, adsorption/desorption properties of ferrihydrite were determined
along oxidation and salinity gradients. Ferrihydrite dominates most of the
Eh-pH-space of the <i class="">in situ</i> peat
waters along with the Fe<sup class="">2+</sup> species at low Eh. It is just under the
most reducing conditions (Eh </span><span lang="EN-GB" class="">< -</span><span lang="EN-GB" class="">0.1
V) and relatively high pH (>7.3) that green rust (GR1(CO3)) and siderite are
stable. Pyrite is only stable in soil solutions with relatively little total
dissolved Fe at low Eh. When these solutions are exposed to oxygen in natural
and man-made trenches, the aqueous Fe<sup class="">2+</sup> is largely transformed into
ferrihydrite; although it has been shown that green rust can form as metastable
intermediate phases. According to the model, the precipitation of ferrihydrite
leads to the near complete adsorption of P, As, Pb and Cu and then, in
descending order, Zn (85%), Cd, Ni and Mn (18%). When the ferrihydrite enters
the ocean, some of these metals will be immediately released to the coastal
waters, though Pb and As are last after mixing more than 1:100,000 with
seawater. These model results will be tested by field and laboratory
experiments. <o:p class=""></o:p></span></p><p class="BodyText1"><span lang="EN-GB" class="">This project has
received funding from the European Union’s Horizon 2020 research and innovation
programme under the Marie Skłodowska-Curie grant agreement No 675219.<o:p class=""></o:p></span></p>
<!--EndFragment--></div><span class=""><br class=""><br class=""></span></div><div class=""><span class=""><br class=""></span></div><span class="">Maren & Maria</span><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">_____________________________</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Maria H. Janebo<br class="">Postdoctoral Research Fellow<br class=""><br class="">Nordic Volcanological Center<br class="">Institute of Earth Sciences<br class="">University of Iceland, Askja 223<br class="">Sturlugata 7, 101 Reykjavik, Iceland</div></div></div>
</div>
<br class=""></div></body></html>