{"id":51859,"date":"2014-10-08T14:30:00","date_gmt":"2014-10-08T14:30:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/which-gc-injection-port-liner-to-use-for-gas-samples\/"},"modified":"2025-11-03T14:01:11","modified_gmt":"2025-11-03T14:01:11","slug":"which-gc-injection-port-liner-to-use-for-gas-samples","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/fr\/blogs-de\/gnbl4868\/which-gc-injection-port-liner-to-use-for-gas-samples","title":{"rendered":"Which GC injection port liner to use for gas samples"},"content":{"rendered":"\n

The answer seems fairly straightforward: Use a narrow internal diameter (ID) liner to keep peak shapes sharp by preventing band broadening; but this isn\u2019t always the correct answer. There has to be enough internal volume in the liner to contain all of the sample.  Let me explain.<\/p>\n\n\n\n

Let\u2019s first look at liners when using purge & trap (P&T)<\/strong>. All instrumentation that I am familiar with uses a transfer line from the P&T unit to the GC injection port.  In this case, you do want to use a narrow ID liner to minimize dead volume and prevent band broadening, especially for the compounds which will not condense and refocus within the capillary column.<\/p>\n\n\n\n

Now let\u2019s look at liners when using headspace (HS)<\/strong>. Headspace units can transfer the sample to the injection port two ways:<\/p>\n\n\n\n

(1) Using a Gas-Tight syringe to fill a sample loop (which is coupled to a transfer line).<\/p>\n\n\n\n

(2) Using a Gas-Tight syringe and injecting directly into an injection port liner.<\/p>\n\n\n\n

If the headspace unit uses a transfer line<\/strong>, then a small ID<\/strong> liner should be used. However, if a Gas-Tight syringe<\/strong> is used to inject the gas sample directly into an injection port liner, then a large ID<\/strong> liner is commonly used. <\/p>\n\n\n\n

<\/div>\n\n\n\n

\u00a0(Splitless<\/strong>\u00a0injections)<\/p>\n\n\n\n

The liner below is a Restek Premium 4.0mm ID Single Taper Inlet Liner (23302), which is typically the best choice for gas injections of approximately > 250\u00b5L to 1mL.<\/p>\n\n\n

\n
\"SG4mmID\"<\/figure>\n<\/div>\n\n\n
<\/div>\n\n\n\n

\u00a0The liner below is a Restek Premium 2.0mm ID Single Taper Inlet Liner (23315), which is typically the best choice for gas injections less than approximately 250\u00b5L.<\/p>\n\n\n

\n
\"SG2mmID\"<\/figure>\n<\/div>\n\n\n
<\/div>\n\n\n\n

\u00a0(Split<\/strong>\u00a0injections)<\/p>\n\n\n\n

If you are injecting gases into a liner using a Gas-Tight syringe and splitting your sample, choose an open-bottom liner (with no gooseneck or other restriction at the bottom), like 23301 (photo below). Restek Premium 4.0 mm ID Straight Inlet Liner<\/p>\n\n\n

\n
\"a<\/figure>\n<\/div>\n\n\n
<\/div>\n\n\n\n

\u00a0If you are not using a syringe for sample introduction but instead the sample is from a purge & trap unit, headspace unit which uses a transfer line, or gas sampling valve, then the liner I usually recommend is 23333 (photo below).\u00a0\u00a0Restek Premium 1.0mm ID Straight Inlet Liner<\/p>\n\n\n

\n
\"1mmID\"<\/figure>\n<\/div>\n\n\n
<\/div>\n\n\n\n

\u00a0Please note<\/strong><\/em>\u00a0that these are representative liners for an Agilent GC with a split\/splitless injection port; the catalog number of the liner you would select depends upon your\u00a0specific instrument and injection port<\/em>.\u00a0\u00a0In addition<\/strong><\/em>, make sure the injection port liner internal diameter (ID) is large enough for a transfer line to fit into the liner (if applicable).\u00a0 For example, I have heard that some transfer lines have an outside diameter (OD) that is larger than 1mm OD; in this case, you would need to use a liner with a 2mm ID or larger opening, and not the 1mm ID liner shown above.\u00a0 As an example, I recently found out that the Agilent 7697 Headspace Sampler requires a 2mmID liner like Restek\u00a023313.<\/p>\n\n\n

\n
\"decorative\"<\/figure>\n<\/div>\n\n\n
<\/div>\n\n\n\n

\u00a0In summary, liner selection for gas samples will depend on your particular instrumentation and how the sample is introduced into the injection port liner. If your instrument uses a transfer line, then a small ID liner will likely provide you the best chromatography.\u00a0 If a Gas-Tight syringe is used to inject the gas sample, a larger internal diameter liner will usually provide you the best results.<\/p>\n\n\n\n

<\/div>\n\n\n
\n

Products Mentioned<\/h3>\n
\n
\n
\n
\n Catalog No. 23302 <\/a> <\/div>\n
\n
Insert Topaz, Gooseneck Splitless, 4.0 mm x 6.5 x 78.5, pour GC Agilent, d\u00e9sactivation Premium, lot de 5<\/div>\n <\/div>\n
\n Voir le produit<\/a>\n <\/div>\n <\/div>\n
\n
\n Catalog No. 23315 <\/a> <\/div>\n
\n
Insert Topaz, Gooseneck Splitless, 2.0 mm x 6.5 x 78.5 pour GC Agilent, d\u00e9sactivation Premium, lot de 5<\/div>\n <\/div>\n
\n Voir le produit<\/a>\n <\/div>\n <\/div>\n
\n
\n Catalog No. 23301 <\/a> <\/div>\n
\n
Insert Topaz, Splitless, 4.0\u00a0mm x 6.3 x 78.5, pour GC Agilent, d\u00e9sactivation Premium, lot de 5<\/div>\n <\/div>\n
\n Voir le produit<\/a>\n <\/div>\n <\/div>\n
\n
\n Catalog No. 23333 <\/a> <\/div>\n
\n
Insert Topaz, Split, 1.0\u00a0mm x 6.3 x 78.5, pour GC Agilent, d\u00e9sactivation Premium, lot de 5<\/div>\n <\/div>\n
\n Voir le produit<\/a>\n <\/div>\n <\/div>\n
\n
\n Catalog No. 23313 <\/a> <\/div>\n
\n
Insert Topaz, Splitless, 2.0\u00a0mm x 6.5 x 78.5, pour GC Agilent, d\u00e9sactivation Premium, lot de 5<\/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":"

The answer seems fairly straightforward: Use a narrow internal diameter (ID) liner to keep peak shapes sharp by preventing band broadening; but this isn’t always the correct answer. There has to be enough internal volume in the liner to contain…<\/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":[792],"tags":[],"industries-application":[],"post-badge":[],"resource-type":[567],"product-library":[],"resource-technique":[2324,2359,2325],"ppma_author":[582],"class_list":["post-51859","post","type-post","status-publish","format-standard","hentry","category-blogs-de","resource-type-selection-guides","resource-technique-gaschromatographie-gc","resource-technique-headspace-de","resource-technique-injektionstechniken"],"acf":[],"taxonomy_info":{"category":[{"value":792,"label":"Blogs"}],"resource-type":[{"value":567,"label":"Selection Guides"}],"resource-technique":[{"value":2324,"label":"Gaschromatographie (GC)"},{"value":2359,"label":"Headspace"},{"value":2325,"label":"Injektionstechniken"}]},"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":792,"name":"Blogs","slug":"blogs-de","term_group":0,"term_taxonomy_id":792,"taxonomy":"category","description":"","parent":0,"count":438,"filter":"raw","cat_ID":792,"category_count":438,"category_description":"","cat_name":"Blogs","category_nicename":"blogs-de","category_parent":0}],"tag_info":false,"authors":[{"term_id":582,"user_id":0,"is_guest":1,"slug":"alan-sensue","display_name":"Alan Sensue","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\/51859","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=51859"}],"version-history":[{"count":2,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/posts\/51859\/revisions"}],"predecessor-version":[{"id":59641,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/posts\/51859\/revisions\/59641"}],"wp:attachment":[{"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/media?parent=51859"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/categories?post=51859"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/tags?post=51859"},{"taxonomy":"industries-application","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/industries-application?post=51859"},{"taxonomy":"post-badge","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/post-badge?post=51859"},{"taxonomy":"resource-type","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/resource-type?post=51859"},{"taxonomy":"product-library","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/product-library?post=51859"},{"taxonomy":"resource-technique","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/resource-technique?post=51859"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/discover.restek.com\/fr\/wp-json\/wp\/v2\/ppma_author?post=51859"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}