{"id":38,"date":"2018-10-10T08:08:29","date_gmt":"2018-10-10T08:08:29","guid":{"rendered":"https:\/\/sed-records-lab.nau.edu\/?page_id=38"},"modified":"2018-10-15T10:19:16","modified_gmt":"2018-10-15T10:19:16","slug":"biogenic-silica-content","status":"publish","type":"page","link":"https:\/\/sed-records-lab.nau.edu\/index.php\/biogenic-silica-content\/","title":{"rendered":"Biogenic-silica Content"},"content":{"rendered":"<p><strong><span style=\"color: #333399;\">Biogenic-silica content<\/span> <\/strong>(wet-alkaline extraction) quantifies the weight percent of algal remains in sediment. It can be used to infer past changes in aquatic productivity and, in some cases, serves as a useful climate proxy. \u00a0Sediment can be analyzed rapidly at high resolution. For example,\u00a0<a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/abs\/10.1029\/2007GL032876\" target=\"_blank\" rel=\"noopener\">McKay et al. (2008) <\/a>found that BSi content in lake sediment from south-central Alaska was correlated with summer air temperature. BSi is extracted from ~100 mg of sediment with 10% Na2CO3 and the concentration is determined with molybdate-blue reduction and spectrophotometry following the procedure of <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/0198014989900927?via%3Dihub\" target=\"_blank\" rel=\"noopener\">Mortlock and Froelich (1989)<\/a>. <a href=\"mailto:darrell.kaufman@nau.edu\">Contact<\/a> the lab for pricing information.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Biogenic-silica content (wet-alkaline extraction) quantifies the weight percent of algal remains in sediment. It can be used to infer past changes in aquatic productivity and, in some cases, serves as a useful climate proxy. \u00a0Sediment can be analyzed rapidly at high resolution. For example,\u00a0McKay et al. (2008) found that BSi content in lake sediment from &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/sed-records-lab.nau.edu\/index.php\/biogenic-silica-content\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Biogenic-silica Content&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":78,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/sed-records-lab.nau.edu\/index.php\/wp-json\/wp\/v2\/pages\/38"}],"collection":[{"href":"https:\/\/sed-records-lab.nau.edu\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sed-records-lab.nau.edu\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sed-records-lab.nau.edu\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sed-records-lab.nau.edu\/index.php\/wp-json\/wp\/v2\/comments?post=38"}],"version-history":[{"count":6,"href":"https:\/\/sed-records-lab.nau.edu\/index.php\/wp-json\/wp\/v2\/pages\/38\/revisions"}],"predecessor-version":[{"id":108,"href":"https:\/\/sed-records-lab.nau.edu\/index.php\/wp-json\/wp\/v2\/pages\/38\/revisions\/108"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sed-records-lab.nau.edu\/index.php\/wp-json\/wp\/v2\/media\/78"}],"wp:attachment":[{"href":"https:\/\/sed-records-lab.nau.edu\/index.php\/wp-json\/wp\/v2\/media?parent=38"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}