{"id":370,"date":"2021-10-23T04:37:24","date_gmt":"2021-10-23T02:37:24","guid":{"rendered":"https:\/\/projets-istep.eu\/?p=370"},"modified":"2021-10-23T04:37:27","modified_gmt":"2021-10-23T02:37:27","slug":"geochimie-a-bord","status":"publish","type":"post","link":"https:\/\/projets-istep.eu\/?p=370","title":{"rendered":"G\u00e9ochimie \u00e0 bord"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>De Marcelo Ketzer<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sulphate analysis onboard<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sulphate (SO4<sup>-2<\/sup>) is the third most important component of seawater after chloride and sodium. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Seawater with sulphate is buried together with the sediments at the bottom of the sea. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The sulphate is used by bacteria living in the sediments to digest the organic matter and methane gas in the absence of oxygen. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We analyse sulphate onboard to have a quick or \u201creal time\u201d information about the presence of methane in the sediment. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The higher the sulphate content, the lower the amount of methane possibly found in the sediment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"787\" height=\"525\" src=\"https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4166.jpg\" alt=\"\" class=\"wp-image-371\" srcset=\"https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4166.jpg 787w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4166-300x200.jpg 300w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4166-768x512.jpg 768w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4166-330x220.jpg 330w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4166-174x116.jpg 174w\" sizes=\"auto, (max-width: 787px) 100vw, 787px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Le sulfate (SO4-2) est le troisi\u00e8me composant le plus important de l&rsquo;eau de mer apr\u00e8s le chlorure et le sodium. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;eau de mer contenant du sulfate est enfouie avec les s\u00e9diments au fond de la mer. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le sulfate est utilis\u00e9 par les bact\u00e9ries vivant dans les s\u00e9diments pour dig\u00e9rer la mati\u00e8re organique et le m\u00e9thane en l&rsquo;absence d&rsquo;oxyg\u00e8ne. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nous analysons le sulfate \u00e0 bord pour avoir une information rapide ou \u00ab\u00a0en temps r\u00e9el\u00a0\u00bb sur la pr\u00e9sence de m\u00e9thane dans les s\u00e9diments. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Plus la teneur en sulfate est \u00e9lev\u00e9e, plus la quantit\u00e9 de m\u00e9thane \u00e9ventuellement pr\u00e9sente dans les s\u00e9diments est faible.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"787\" height=\"465\" src=\"https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4181.jpg\" alt=\"\" class=\"wp-image-372\" srcset=\"https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4181.jpg 787w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4181-300x177.jpg 300w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4181-768x454.jpg 768w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_4181-196x116.jpg 196w\" sizes=\"auto, (max-width: 787px) 100vw, 787px\" \/><figcaption><em>Les seringues permettent de r\u00e9colter l&rsquo;eau contenue dans les s\u00e9diments<\/em><\/figcaption><\/figure>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_3929.jpg\" alt=\"\" class=\"wp-image-378\" width=\"348\" height=\"512\" srcset=\"https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_3929.jpg 591w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_3929-204x300.jpg 204w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_3929-79x116.jpg 79w\" sizes=\"auto, (max-width: 348px) 100vw, 348px\" \/><figcaption><em>L&rsquo;eau est ensuite analys\u00e9e<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"591\" height=\"394\" src=\"https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_3909.jpg\" alt=\"\" class=\"wp-image-379\" srcset=\"https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_3909.jpg 591w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_3909-300x200.jpg 300w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_3909-330x220.jpg 330w, https:\/\/projets-istep.eu\/wp-content\/uploads\/2021\/10\/IMG_3909-174x116.jpg 174w\" sizes=\"auto, (max-width: 591px) 100vw, 591px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>De Marcelo Ketzer Sulphate analysis onboard Sulphate (SO4-2) is the third most important component of seawater after chloride and sodium. Seawater with sulphate is buried together with the sediments at the bottom of the sea. The sulphate is used by bacteria living in the sediments to digest the organic matter and methane gas in the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":373,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-370","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-education"],"_links":{"self":[{"href":"https:\/\/projets-istep.eu\/index.php?rest_route=\/wp\/v2\/posts\/370","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/projets-istep.eu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/projets-istep.eu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/projets-istep.eu\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/projets-istep.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=370"}],"version-history":[{"count":2,"href":"https:\/\/projets-istep.eu\/index.php?rest_route=\/wp\/v2\/posts\/370\/revisions"}],"predecessor-version":[{"id":380,"href":"https:\/\/projets-istep.eu\/index.php?rest_route=\/wp\/v2\/posts\/370\/revisions\/380"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/projets-istep.eu\/index.php?rest_route=\/wp\/v2\/media\/373"}],"wp:attachment":[{"href":"https:\/\/projets-istep.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=370"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/projets-istep.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=370"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/projets-istep.eu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}