{"id":43648,"date":"2020-10-28T00:00:00","date_gmt":"2020-10-28T00:00:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/how-to-diagnose-gc-septum-bleed-contamination-sources-could-it-be-your-vial-cap\/"},"modified":"2026-01-03T20:04:06","modified_gmt":"2026-01-03T20:04:06","slug":"how-to-diagnose-gc-septum-bleed-contamination-sources-could-it-be-your-vial-cap","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/ja\/articles\/gnar2846\/how-to-diagnose-gc-septum-bleed-contamination-sources-could-it-be-your-vial-cap","title":{"rendered":"How to Diagnose GC Septum Bleed Contamination Sources: Could it be Your Vial Cap?"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li>Identifying vial cap septum bleed prevents lengthy inlet troubleshooting.<\/li>\n\n\n\n<li>Reduce interference with correct solvent-septum compatibility.<\/li>\n<\/ul>\n\n\n\n<p>When septum bleed occurs, it is observed as sharp, repetitive peaks in high temperature portions of an analysis. Bleed peaks can come from either the inlet septum or the vial cap septum. Interfering peaks and inaccurate data can result, so it is important to correctly identify the source and to understand how to eliminate or minimize the bleed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Diagnose GC Septum Bleed: What&#8217;s the Source?<\/h2>\n\n\n\n<p>The bleed from either septum shows a similar pattern (Figure 1), but it is easy to determine the source with a simple test. Isolate the inlet by setting the instrument to perform a run without an injection. Perform an analysis; if the bleed disappears, then the vial cap septum was the source. Determining if the vial cap septum is the source of the bleed can save time by preventing unnecessary troubleshooting and maintenance. If the problem is in the inlet, review our&nbsp;<a href=\"https:\/\/www.restek.com\/articles\/preventing-gc-septum-problems\/\" target=\"_blank\" rel=\"noopener\">technical article<\/a>&nbsp;before replacing the septum. However, if the vial cap septum is causing the bleed, the issue can be eliminated or minimized with the following considerations.<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 1:<\/strong>\u00a0The presence of sharp, repetitive peaks is a characteristic that helps identify GC septum bleed from either the vial cap or inlet.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<div class=\"wp-block-custom-chromatogram-article\"><div class=\"wp-block-custom-chromatogram-article\"><div class=\"chromatogram-image wide-image\"><img decoding=\"async\" src=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ex00980.png\" alt=\"Example of Vial Cap or Injection Port Septum Bleed\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_EX00980<\/p><div class=\"chromatogram-conditions\"><h4>Conditions<\/h4><div class=\"conditions-container container-fluid\"><div class=\"row\"><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Column<\/th><td>Rtx-5MS, 30 m, 0.25 mm ID, 0.25 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/12623?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EX00980\" rel=\"noopener\">cat.# 12623<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td>Methylene chloride blank<\/td><\/tr>\n<tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Injection<\/th><td><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Vol.:<\/th><td>1.0 \u00b5L split (split ratio 10:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>4.0 mm ID straight inlet liner w\/wool (standard deactivation) (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/20782?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EX00980\" rel=\"noopener\">cat.# 20782<\/a>)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>240 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\" colspan=\"2\">Oven<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Oven Temp.:<\/th><td>70 &#176;C (hold 1 min) to 290 &#176;C at 20 &#176;C\/min (hold 13 min)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Carrier Gas<\/th><td>He, constant flow<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Flow Rate:<\/th><td>1.2 mL\/min<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>FID @ 250 \u00b0C<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-related-skus\"><h4>Related SKUs<\/h4><ul><li>12623<\/li><li>20782<\/li><\/ul><\/div><div class=\"chromatogram-related-searches\"><h4>Related Searches<\/h4><ul><li>Coring<\/li><li>bleed<\/li><li>bleed contamination<\/li><li>contamination<\/li><li>interfering peaks<\/li><li>septa bleed<\/li><li>septum bleed<\/li><li>troubleshooting<\/li><li>vial septum<\/li><\/ul><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ex00980.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\"><g data-name=\"Group 2996\"><path data-name=\"Rectangle 1246\" d=\"M0 0h18v18H0z\" style=\"fill: none;\"><\/path><\/g><g data-name=\"Group 2997\"><path data-name=\"Path 729\" d=\"M13.412 11.4v2.017H5.345V11.4H4v2.017a1.349 1.349 0 0 0 1.345 1.345h8.068a1.349 1.349 0 0 0 1.345-1.345V11.4zm-.672-2.694-.948-.948-1.741 1.735V4H8.706v5.493L6.965 7.758l-.948.948 3.361 3.361z\" transform=\"translate(-.437 -.414)\" style=\"fill: rgb(13, 123, 196);\"><\/path><\/g><\/svg>Download PDF<\/a><\/div><\/div><\/div>\n<\/div><\/div><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Check Solvent-Septum Compatibility<\/h2>\n\n\n\n<p>Once you\u2019ve diagnosed the GC septum bleed source as the vial cap, the first step in resolving the issue is to make sure that the vial cap septum material is compatible with your injection solvent. While septum bleed is not excessive most of the time, when a solvent and vial cap septum are incompatible, extreme contamination can occur. Figure 2 compares the first and fifth injections from a vial containing a derivatized amphetamine sample. In this case, the septum bleed peaks are almost as large as the analyte peaks. This level of bleed can interfere with analyses, especially those geared for trace levels. Reduce the risk of septum bleed by using a&nbsp;<a href=\"https:\/\/www.restek.com\/articles\/vial-septum-selection-guide\" target=\"_blank\" rel=\"noopener\">compatibility chart&nbsp;<\/a>to determine which septum material is compatible with the sample solvent used.<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 2:<\/strong>\u00a0Contamination from septum bleed can cause significant interference with target analytes.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<div class=\"wp-block-custom-chromatogram-article\"><div class=\"wp-block-custom-chromatogram-article\"><div class=\"chromatogram-image regular-image\"><img decoding=\"async\" src=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ex00981.png\" alt=\"Septum Bleed Causing Significant Interference with Target Analytes\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_EX00981<\/p><div class=\"chromatogram-peaks\"><h4>Peaks<\/h4><table class=\"peaks col-lg-4 col-12\">\n<thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><\/tr><\/thead>\n<tbody><tr><td class=\"num\">1.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Amphetamine\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/300-62-9\/Amphetamine\" target=\"_blank\" rel=\"noopener\">Amphetamine<\/a><\/td><\/tr>\n<tr><td class=\"num\">2.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Methamphetamine\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/51-57-0\/Methamphetamine\" target=\"_blank\" rel=\"noopener\">Methamphetamine<\/a><\/td><\/tr>\n<tr><td class=\"num\">3.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for MDA\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/4764-17-4\/MDA\" target=\"_blank\" rel=\"noopener\">MDA<\/a><\/td><\/tr>\n<tr><td class=\"num\">4.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for MDMA\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/42542-10-9\/MDMA\" target=\"_blank\" rel=\"noopener\">MDMA<\/a><\/td><\/tr>\n<tr><td class=\"num\">5.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for MDEA\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/82801-81-8\/MDEA\" target=\"_blank\" rel=\"noopener\">MDEA<\/a><\/td><\/tr>\n<\/tbody><\/table><\/div><div class=\"chromatogram-conditions\"><h4>Conditions<\/h4><div class=\"conditions-container container-fluid\"><div class=\"row\"><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Column<\/th><td>Rtx-5MS, 30 m, 0.25 mm ID, 0.25 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/12623?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EX00981\" rel=\"noopener\">cat.# 12623<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td>Amphetamine, methamphetamine, MDA, MDMA, and MDEA extracted from methanol and HFAA derivatized<\/td><\/tr>\n<tr><th class=\"sub conditions_header\" scope=\"row\">Conc.:<\/th><td>100 \u00b5g\/mL each<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Injection<\/th><td><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Vol.:<\/th><td>1 \u00b5L splitless (hold 0.5  min)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>3.5 mm Custom splitless inlet liner w\/ standard deactivated wool<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>220 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\" colspan=\"2\">Oven<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Oven Temp.:<\/th><td>70 &#176;C (hold 1 min) to 290 &#176;C at 15 &#176;C\/min (hold 4 min)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Carrier Gas<\/th><td>He, constant flow<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Flow Rate:<\/th><td>1.25 mL\/min<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>MS<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Mode:<\/th><td>Scan<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Transfer Line Temp.:<\/th><td>280 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Ionization Mode:<\/th><td>EI <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Scan Range:<\/th><td>43-450 amu<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ex00981.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\"><g data-name=\"Group 2996\"><path data-name=\"Rectangle 1246\" d=\"M0 0h18v18H0z\" style=\"fill: none;\"><\/path><\/g><g data-name=\"Group 2997\"><path data-name=\"Path 729\" d=\"M13.412 11.4v2.017H5.345V11.4H4v2.017a1.349 1.349 0 0 0 1.345 1.345h8.068a1.349 1.349 0 0 0 1.345-1.345V11.4zm-.672-2.694-.948-.948-1.741 1.735V4H8.706v5.493L6.965 7.758l-.948.948 3.361 3.361z\" transform=\"translate(-.437 -.414)\" style=\"fill: rgb(13, 123, 196);\"><\/path><\/g><\/svg>Download PDF<\/a><\/div><\/div><\/div>\n<\/div><\/div><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Use Lined Septa<\/h2>\n\n\n\n<p>Most vial cap septa are lined with a protective layer of polytetrafluoroethylene (PTFE) to prevent solvent attack. As shown in Figure 3, PTFE effectively prevents septum breakdown due to solvent exposure. In comparison, unlined vial cap septa exhibit bleed after just 24 hours at room temperature. Bleed levels for unlined vial cap septa varied by material, but even a low level of bleed can interfere with integration and is of particular concern for trace analyses (Figure 4).<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 3:<\/strong>\u00a0PTFE lining on vial cap septa prevents bleed due to solvent\/septum interaction.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43648_bf4093-80 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43648_bf4093-80\"><figure class=\"aligncenter size-medium_large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"480\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-03-768x480.jpg\" alt=\"\" class=\"kb-img wp-image-20782\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-03-768x480.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-03-300x187.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-03-1024x639.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-03-1536x959.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-03.jpg 1800w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 4:<\/strong>\u00a0Unlined vial cap septa show bleed contamination within 24 hours.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43648_05e699-88 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43648_05e699-88\"><figure class=\"aligncenter size-medium_large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"602\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-04-768x602.jpg\" alt=\"\" class=\"kb-img wp-image-20788\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-04-768x602.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-04-300x235.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-04-1024x803.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-04-1536x1205.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-04.jpg 1800w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Consider Resealability<\/h2>\n\n\n\n<p>Multiple injections can core the vial cap septum and lead to significant GC septum bleed. Resistance to coring varies by septum material (Figure 5). Coring can be minimized by preparing separate vials for replicate injections, when feasible, and by carefully considering the type of septum material when multiple injections are necessary. Septum resealability also affects evaporative loss, which can be a significant source of error for low volume samples. For example, a relatively nonvolatile analyte in a volatile solvent can concentrate significantly due to evaporative loss (Figure 6). Vials should be recapped when necessary for extended runs or long-term storage.<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 5:<\/strong>\u00a0Bleed contamination increases over multiple injections.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43648_c129e2-40 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43648_c129e2-40\"><figure class=\"aligncenter size-medium_large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"539\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-05-768x539.jpg\" alt=\"\" class=\"kb-img wp-image-20794\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-05-768x539.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-05-300x211.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-05-1024x719.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-05-1536x1079.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-05.jpg 1800w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 6:<\/strong>\u00a0This bar graph shows the volume of solvent lost for three septum types. Vials containing 300 \u00b5L of methylene chloride were punctured and left at room temperature for 24 hours<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43648_50f130-84 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43648_50f130-84\"><figure class=\"aligncenter size-medium_large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"527\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-06-768x527.jpg\" alt=\"\" class=\"kb-img wp-image-20800\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-06-768x527.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-06-300x206.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-06-1024x703.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-06-1536x1055.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR2846-06.jpg 1800w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>When septum bleed occurs, it is easy to assume the inlet septum is the source because the vial cap septum often is not considered. However, correctly identifying the GC septum bleed source can save time and effort by preventing unnecessary inlet maintenance. Effectively and efficiently reducing interfering peaks by controlling septum bleed can significantly improve analytical performance, particularly for trace analyses.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In gas chromatography, septum bleed is often attributed to the inlet septum, but the vial cap septum can also be a source. Fortunately, it\u2019s easy to determine which septum is causing the problem and by identifying it so you can avoid the time and trouble of unnecessary inlet maintenance. Read on to learn how to identify vial cap septum bleed and also how to choose a GC septum that will reduce the problem.<\/p>\n","protected":false},"author":11,"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":[7],"tags":[],"industries-application":[],"post-badge":[],"resource-type":[569],"product-library":[2372,2386,2375,2405],"resource-technique":[2294,2301],"ppma_author":[414],"class_list":["post-43648","post","type-post","status-publish","format-standard","hentry","category-articles","resource-type-troubleshooting","product-library-gas-chromatography-products","product-library-inlet-supplies","product-library-sample-preparation-products","product-library-vials-accessories","resource-technique-gas-chromatography-gc","resource-technique-mass-spectrometry-ms"],"acf":[],"taxonomy_info":{"category":[{"value":7,"label":"Articles"}],"resource-type":[{"value":569,"label":"Troubleshooting"}],"product-library":[{"value":2372,"label":"Gas Chromatography Products"},{"value":2386,"label":"Inlet Supplies"},{"value":2375,"label":"Sample Preparation Products"},{"value":2405,"label":"Vials &amp; Accessories"}],"resource-technique":[{"value":2294,"label":"Gas Chromatography (GC)"},{"value":2301,"label":"Mass Spectrometry (MS)"}]},"featured_image_src_large":false,"author_info":{"display_name":"Restek Corporation","author_link":"https:\/\/discover.restek.com\/ja\/author\/restek-corporation\/"},"comment_info":0,"category_info":[{"term_id":7,"name":"Articles","slug":"articles","term_group":0,"term_taxonomy_id":7,"taxonomy":"category","description":"","parent":0,"count":465,"filter":"raw","cat_ID":7,"category_count":465,"category_description":"","cat_name":"Articles","category_nicename":"articles","category_parent":0}],"tag_info":false,"authors":[{"term_id":414,"user_id":11,"is_guest":0,"slug":"restek-corporation","display_name":"Restek Corporation","avatar_url":{"url":"https:\/\/discover.restek.com\/wp-content\/uploads\/Restek_Favicon_300x300.jpg","url2x":"https:\/\/discover.restek.com\/wp-content\/uploads\/Restek_Favicon_300x300.jpg"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/posts\/43648","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/comments?post=43648"}],"version-history":[{"count":5,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/posts\/43648\/revisions"}],"predecessor-version":[{"id":79518,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/posts\/43648\/revisions\/79518"}],"wp:attachment":[{"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/media?parent=43648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/categories?post=43648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/tags?post=43648"},{"taxonomy":"industries-application","embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/industries-application?post=43648"},{"taxonomy":"post-badge","embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/post-badge?post=43648"},{"taxonomy":"resource-type","embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/resource-type?post=43648"},{"taxonomy":"product-library","embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/product-library?post=43648"},{"taxonomy":"resource-technique","embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/resource-technique?post=43648"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/discover.restek.com\/ja\/wp-json\/wp\/v2\/ppma_author?post=43648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}