Title: Iodide Retention by Metal Sulfide Surfaces: Cinnabar and Chalcocite
Abstract:Ion exchange between aqueous protons and surface Hg and Cu sites on cinnabar (HgS) and chalcocite (Cu2S) are examined by potentiometric titrations at 25 °C in 1, 0.1, 0.01, and 0.001 M NaCl solutions....Ion exchange between aqueous protons and surface Hg and Cu sites on cinnabar (HgS) and chalcocite (Cu2S) are examined by potentiometric titrations at 25 °C in 1, 0.1, 0.01, and 0.001 M NaCl solutions. Cinnabar and chalcocite surfaces are negatively charged at pH > 3, presumably due to deprotonation of exposed thiol groups. Despite the anionic nature of the two metal sulfide surfaces, iodide sorbs strongly to both. Measured distribution ratios (Kd) far exceed those reported for all other minerals; maximal Kd's of 1375 mL/g (Cu2S) and 3080 mL/g (HgS) were observed between pH 4 and pH 5 and were substantial at all pH's measured (4 < pH < 10). Iodide sorption apparently occurs by exchange of hydroxyls attached to Hg and Cu sites.Read More
Publication Year: 1996
Publication Date: 1996-09-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 76
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot