{"id":51786,"date":"2009-11-25T13:30:00","date_gmt":"2009-11-25T13:30:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/selectivity-differences-in-arylene-gc-phases-pesticides-and-zebras\/"},"modified":"2025-10-30T22:39:27","modified_gmt":"2025-10-30T22:39:27","slug":"selectivity-differences-in-arylene-gc-phases-pesticides-and-zebras","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/fr\/blogs\/gnbl4788\/selectivity-differences-in-arylene-gc-phases-pesticides-and-zebras","title":{"rendered":"Selectivity differences in arylene GC phases…pesticides and zebras."},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Although not obvious even to a careful observer, no zebra has exactly the same stripe pattern. Fortunately for GCers, there isn\u2019t that much variation in \u201c5 type\u201d columns, but users need to be aware that 5% pendant phenyl and 5% phenyl-as-silphenylene (or arylene) columns have slightly different selectivities. Recently we analyzed 31 pesticides on Rxi-5ms (pendant phenyl) and Rxi-5Sil MS (silphenylene). While the complete chromatograms looked very similar, close inspection revealed differences (see figure).<\/p>\n\n\n\n

Remember that arylene phases have polymer backbone modifications to lower bleed. Restek makes it easy to remember which columns have this modification by using \u201cSil\u201d in the name (e.g. Rxi-5Sil MS, Rxi-35Sil MS, and Rxi-624Sil MS). If you decide to change from your \u201cstandard\u201d GC phase to an arylene phase, watch out for slight selectivity differences.<\/p>\n\n\n\n

<\/div>\n\n\n
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Products Mentioned<\/h3>\n
\n
\n
\n
\n Catalog No. 13623 <\/a> <\/div>\n
\n
Colonne capillaire Rxi-5Sil MS, L 30\u00a0m, DI 0.25 mm, 0.25 \u00b5m<\/div>\n <\/div>\n
\n Voir le produit<\/a>\n <\/div>\n <\/div>\n
\n
\n Catalog No. 13423 <\/a> <\/div>\n
\n
Colonne capillaire Rxi-5ms, L 30\u00a0m, DI 0.25 mm, 0.25 \u00b5m<\/div>\n <\/div>\n
\n Voir le produit<\/a>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n \n\n\n
<\/div>\n","protected":false},"excerpt":{"rendered":"

Although not obvious even to a careful observer, no zebra has exactly the same stripe pattern. Fortunately for GCers, there isn’t that much variation in “5 type” columns, but users need to be aware that 5% pendant phenyl and 5%…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[9],"tags":[],"industries-application":[2161],"post-badge":[],"resource-type":[],"product-library":[],"resource-technique":[2294],"ppma_author":[590],"class_list":["post-51786","post","type-post","status-publish","format-standard","hentry","category-blogs","industries-application-environmental","resource-technique-gas-chromatography-gc"],"acf":[],"taxonomy_info":{"category":[{"value":9,"label":"Blogs"}],"industries-application":[{"value":2161,"label":"Environmental"}],"resource-technique":[{"value":2294,"label":"Gas Chromatography (GC)"}]},"featured_image_src_large":false,"author_info":{"display_name":"Patrick Gallagher","author_link":"https:\/\/discover.restek.com\/fr\/author\/patrick-gallagherrestek-com\/"},"comment_info":0,"category_info":[{"term_id":9,"name":"Blogs","slug":"blogs","term_group":0,"term_taxonomy_id":9,"taxonomy":"category","description":"","parent":0,"count":442,"filter":"raw","cat_ID":9,"category_count":442,"category_description":"","cat_name":"Blogs","category_nicename":"blogs","category_parent":0}],"tag_info":false,"authors":[{"term_id":590,"user_id":0,"is_guest":1,"slug":"jack-cochran","display_name":"Jack Cochran","avatar_url":"https:\/\/secure.gravatar.com\/avatar\/?s=96&d=mm&r=g","0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/posts\/51786","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/comments?post=51786"}],"version-history":[{"count":2,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/posts\/51786\/revisions"}],"predecessor-version":[{"id":59458,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/posts\/51786\/revisions\/59458"}],"wp:attachment":[{"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/media?parent=51786"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/categories?post=51786"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/tags?post=51786"},{"taxonomy":"industries-application","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/industries-application?post=51786"},{"taxonomy":"post-badge","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/post-badge?post=51786"},{"taxonomy":"resource-type","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/resource-type?post=51786"},{"taxonomy":"product-library","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/product-library?post=51786"},{"taxonomy":"resource-technique","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/resource-technique?post=51786"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/ppma_author?post=51786"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}