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Formation of cinnabar: estimation of favourable conditions in a proposed Swedish repository
Örebro University, Department of Natural Sciences.
Örebro University, Department of Natural Sciences.
Örebro University, Department of Natural Sciences.ORCID iD: 0000-0002-2104-4593
2006 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 136, no 3, p. 830-836Article in journal (Refereed) Published
Abstract [en]

A deep repository for permanent storage of mercury will be designed and built in Sweden. The preferred chemical state for mercury in such a repository would be the sulphide HgS (cinnabar), which is a highly insoluble and the dominating natural mercury mineral. The possible formation of HgS from HgO or Hg(0) by reaction with a sulphur source (S, FeS or FeS2) is discussed from thermodynamic considerations, and pe–pH-diagrams are constructed by using the computer code MEDUSA to illustrate under which conditions HgS would dominate. Calculations of the speciation (PHREEQE) under varying conditions (S/Hg-ratios, presence of chloride) are given.

Long-term laboratory experiments are performed, where the formation of HgS from the basic components is demonstrated (after mixing under various conditions and storage at room temperature for up to 3 years).

The feasibility of HgS-formation with time in a geologic repository under conditions representative of deep granitic bedrock (calcium-bicarbonate buffered to pH 7–8.5) is discussed, as well as effects of alkaline conditions (concrete environment, pH 10.5–12.5). Formation of soluble polysulphides is not expected as long as the S/Hg mole ratio is within 1–1.3 and pH is below 10.5–11. Concrete should be used with caution. Suitable ballast materials could be introduced that would reduce porewater-pH that otherwise would be above 12.

Place, publisher, year, edition, pages
Amsterdam: Elsevier , 2006. Vol. 136, no 3, p. 830-836
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-15127DOI: 10.1016/j.jhazmat.2006.01.018OAI: oai:DiVA.org:oru-15127DiVA, id: diva2:406787
Available from: 2011-03-28 Created: 2011-03-28 Last updated: 2017-12-11Bibliographically approved

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Svensson, MargaretaDüker, AndersAllard, Bert

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