H2020Индивидуална стипендия2016–2018

BRISOACTIONS · To understand the redox variations and interactions between hydro-, bio- and atmosphere: the power of bromine stable isotopes.

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2016-09-01 → 2018-08-31
Финансиране от ЕС: 185 076 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Стабилните изотопи на брома се анализират, за да се разберат химичните процеси между водата, живите организми и атмосферата. Това помага за по-доброто разбиране на окислително-редукционните реакции и разликите между поведението на брома и хлора.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

To understand the redox variations and interactions between hydro-, bio- and atmosphere: the power of bromine stable isotopes.

Bromine (Br) is chemically similar to chlorine (Cl) and also has two stable isotopes (79Br and 81Br). Thus its stable isotope variations can be studied just like for Cl. Br isotopes are studied since about 1995 and show that the isotope geochemistry of Br is very different from that of Cl. Br isotope ratios are generally higher, while Cl isotope ratios are lower. The isotope ratio distribution is also different. Cl shows a very narrow range around the seawater composition with a very long negative tail, Br shows a broader range without extreme values. As Br is heavier than Cl its isotope fractionation is smaller than for Cl. The only processes known to cause large Br isotope variations are redox processes. BRISOACTIONS was set up to study Br isotope systems in order to understand Br isotope fractionation and to compare with Cl. It was expected to lead to a better understanding of the differences between the two systems. Br isotope fractionation was hardly understood at the moment of writing the proposal. As it was expected that redox processes are the most promising processes it was projected to be important processes to study. It was also planned to study isotope behaviour in evaporation and ion-filtration systems. Primary results obtained were surprising and obliged us to change the planning for the project considerably.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The stable isotope geochemistry of chlorine (Cl) and bromine (Br) are considerably different. While most Cl isotope data are in the range from -1.21 to +0.40‰, Br isotope data are from -0.06 to +1.48‰. Interesting is that Br isotope variations are of the same magnitude as Cl isotope variations. Also Br isotope values of ancient evaporites are very positive (+0.6‰), impossible to explain from oceans with a modern isotope composition. These data are unexpected considering the small fractionation factors for Br compared to Cl.The research we propose aims at understanding these observations and developing halogen stable isotopes to study fluid transport processes in porous media. This research has a great potential to understand the history and the migration of fluids in deep porous reservoirs which are considered for geological storage of CO2, H2 and hydrocarbons.First we aim to study historical variations of Br isotope compositions in the earth's surface reservoirs. We will study Br isotope variations in ancient evaporites that reflect Br isotope ratios of the oceans at the moment they were deposited.Second to study the geochemical processes that affect Cl and Br isotope variations. Isotope fractionation during ion-filtration that has never been studied in detail. This process is important to understand subsurface fluid flow and fractionation of ions and isotopes during fluid transport. We aim at studying Cl and Br isotope variations during this process. Also redox processes have hardly been studied. Oxidation processes can increase Br isotopes values more than Cl in spite of Br's much smaller isotope fractionation factors.Third to understand our observations we will compare the data obtained during this study with the geochemical cycles of Cl and Br. This will allow us to develop future research to continue to improve our knowledge on Cl and Br isotope variations as proxies to understand chemical cycles on earth, especially in fluids in deep porous reservoirs.

Оригинален текст от CORDIS (на английски).

Участници

INSTITUT DE PHYSIQUE DU GLOBE DE PARIS · ParisКоординаторФранция