{"id":709,"date":"2025-09-12T15:48:40","date_gmt":"2025-09-12T13:48:40","guid":{"rendered":"https:\/\/sites.unica.it\/superfici\/?page_id=709"},"modified":"2025-09-12T16:39:47","modified_gmt":"2025-09-12T14:39:47","slug":"the-surface-of-sulfide-minerals","status":"publish","type":"page","link":"https:\/\/sites.unica.it\/superfici\/the-surface-of-sulfide-minerals\/","title":{"rendered":"The surface of sulfide minerals"},"content":{"rendered":"\n<p><strong>Oxidation\/dissolution reactions at the surface of sulfide minerals of environmental interest&nbsp;<\/strong><\/p>\n\n\n\n<p>Sulfide minerals such as enargite (Cu<sub>3<\/sub>AsS<sub>4<\/sub>), arsenopirite (FeAsS) or tennantite (Cu<sub>12<\/sub>As<sub>4<\/sub>S<sub>13<\/sub>) present a potential environmental impact when dissolved in natural environ-ments, not only by release toxic arsenic or associated heavy metals but also due to a recuction in pH resulting in acid mine waters.&nbsp;<br>In this research work, the surface reactivity of arsenic containing sulfide minerals is studied by \u201cin situ\u201d electrochemical and \u201cex situ\u201d surface analytical methods such as XPS and XAES (X-ray excited Auger spectrospcopy) in aerated and deaerated aqueous environments of different pH.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\" style=\"grid-template-columns:40% auto\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"943\" src=\"https:\/\/sites.unica.it\/superfici\/files\/2025\/09\/Enargite_SEM-1024x943.jpg\" alt=\"\" class=\"wp-image-710 size-full\" srcset=\"https:\/\/sites.unica.it\/superfici\/files\/2025\/09\/Enargite_SEM-1024x943.jpg 1024w, https:\/\/sites.unica.it\/superfici\/files\/2025\/09\/Enargite_SEM-300x276.jpg 300w, https:\/\/sites.unica.it\/superfici\/files\/2025\/09\/Enargite_SEM-768x707.jpg 768w, https:\/\/sites.unica.it\/superfici\/files\/2025\/09\/Enargite_SEM-1536x1415.jpg 1536w, https:\/\/sites.unica.it\/superfici\/files\/2025\/09\/Enargite_SEM.jpg 1924w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p>The&nbsp;<strong>chemical state of the elements<\/strong>&nbsp;of enargite (and other sulfide minerals) was determined based on the chemical state plot. In enargite, arsenic&#8230; <a href=\"https:\/\/sites.unica.it\/superfici\/xps-and-xaes-analysis-of-copper-arsenic-and-sulfur-chemical-state-in-enargite\/\">More&nbsp;&gt;&gt;&gt;<\/a><\/p>\n\n\n\n<p>A<strong>rsenic in complex environmental samples<\/strong>&nbsp;(mine tailings, scorodite) was found to be As(V)&#8230;&nbsp;&nbsp; More&nbsp;&gt;&gt;&gt;<\/p>\n\n\n\n<p>Combining solution analysis and XPS surface analysis allowed to propose a <strong>model for the initial stages of enargite disso- lution<\/strong> similar to binary metal alloys.&nbsp; <a href=\"https:\/\/sites.unica.it\/superfici\/electrochemical-and-xps-surface-analytical-studies-on-the-reactivity-of-enargite\/\">More&nbsp;&gt;&gt;&gt;<\/a><\/p>\n\n\n\n<p>The\u00a0<strong>surface of enargite after exposure<\/strong>\u00a0to acidic ferric solutions simulating acid mine drainage environment &#8230;. <a href=\"https:\/\/sites.unica.it\/superfici\/the-surface-of-enargite-after-exposure-to-acidic-ferric-solutions-an-xps-xaes-study\/\">More\u00a0&gt;&gt;&gt;<\/a><\/p>\n<\/div><\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oxidation\/dissolution reactions at the surface of sulfide minerals of environmental interest&nbsp; Sulfide minerals such as enargite (Cu3AsS4), arsenopirite (FeAsS) or tennantite (Cu12As4S13) present a potential environmental impact when dissolved in natural environ-ments, not only by release [&hellip;]<\/p>\n","protected":false},"author":335,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-709","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/pages\/709","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/users\/335"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/comments?post=709"}],"version-history":[{"count":8,"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/pages\/709\/revisions"}],"predecessor-version":[{"id":728,"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/pages\/709\/revisions\/728"}],"wp:attachment":[{"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/media?parent=709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}