Effect of Helium in Helium Headspace Carbon Dioxide Cylinders on Packed-Column Supercritical Fluid Chromatography
Supercritical fluid chromatography of PAHs was performed with pure carbon dioxide and helium headspace carbon dioxide at various cylinder fill levels. The retention times of the PAHs increased when helium headspace carbon dioxide was used as a carrier fluid relative to pure carbon dioxide. The incre...
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| Veröffentlicht in: | Analytical chemistry (Washington) 1996-03, Vol.68 (5), p.894-898 |
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| container_title | Analytical chemistry (Washington) |
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| creator | Leichter, Eric Strode, J. Thompson B Taylor, Larry T Schweighardt, Frank K |
| description | Supercritical fluid chromatography of PAHs was performed with pure carbon dioxide and helium headspace carbon dioxide at various cylinder fill levels. The retention times of the PAHs increased when helium headspace carbon dioxide was used as a carrier fluid relative to pure carbon dioxide. The increased retention times were affected by the level of the liquid phase present in the helium headspace carbon dioxide cylinder. As more liquid phase was removed from the cylinder, the effect of helium on the solvating power of CO2 was reduced because the relative amount of helium dissolved in the liquid phase decreased. Furthermore, the effect of helium headspace carbon dioxide was investigated with methanol-modified carbon dioxide mobile phases for the analysis of steroids. We observed that the relative solubility of helium in carbon dioxide resulted in longer retention times when compared to pure carbon dioxide as the liquid level of carbon dioxide decreased. |
| doi_str_mv | 10.1021/ac950922y |
| format | Article |
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We observed that the relative solubility of helium in carbon dioxide resulted in longer retention times when compared to pure carbon dioxide as the liquid level of carbon dioxide decreased.</description><identifier>ISSN: 0003-2700</identifier><identifier>EISSN: 1520-6882</identifier><identifier>DOI: 10.1021/ac950922y</identifier><identifier>PMID: 21619186</identifier><identifier>CODEN: ANCHAM</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Analytical chemistry ; Carbon dioxide ; Chemistry ; Chromatographic methods and physical methods associated with chromatography ; Exact sciences and technology ; Helium ; Hydrocarbons ; Other chromatographic methods</subject><ispartof>Analytical chemistry (Washington), 1996-03, Vol.68 (5), p.894-898</ispartof><rights>Copyright © 1996 American Chemical Society</rights><rights>1996 INIST-CNRS</rights><rights>Copyright American Chemical Society Mar 1, 1996</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a406t-601bad29d9653bf1b0760918be61a35d3be9ee353f73d58acc3c7e78af2264c83</citedby><cites>FETCH-LOGICAL-a406t-601bad29d9653bf1b0760918be61a35d3be9ee353f73d58acc3c7e78af2264c83</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/ac950922y$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/ac950922y$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,776,780,2752,27053,27901,27902,56713,56763</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2994221$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/21619186$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Leichter, Eric</creatorcontrib><creatorcontrib>Strode, J. Thompson B</creatorcontrib><creatorcontrib>Taylor, Larry T</creatorcontrib><creatorcontrib>Schweighardt, Frank K</creatorcontrib><title>Effect of Helium in Helium Headspace Carbon Dioxide Cylinders on Packed-Column Supercritical Fluid Chromatography</title><title>Analytical chemistry (Washington)</title><addtitle>Anal. Chem</addtitle><description>Supercritical fluid chromatography of PAHs was performed with pure carbon dioxide and helium headspace carbon dioxide at various cylinder fill levels. The retention times of the PAHs increased when helium headspace carbon dioxide was used as a carrier fluid relative to pure carbon dioxide. The increased retention times were affected by the level of the liquid phase present in the helium headspace carbon dioxide cylinder. As more liquid phase was removed from the cylinder, the effect of helium on the solvating power of CO2 was reduced because the relative amount of helium dissolved in the liquid phase decreased. Furthermore, the effect of helium headspace carbon dioxide was investigated with methanol-modified carbon dioxide mobile phases for the analysis of steroids. We observed that the relative solubility of helium in carbon dioxide resulted in longer retention times when compared to pure carbon dioxide as the liquid level of carbon dioxide decreased.</description><subject>Analytical chemistry</subject><subject>Carbon dioxide</subject><subject>Chemistry</subject><subject>Chromatographic methods and physical methods associated with chromatography</subject><subject>Exact sciences and technology</subject><subject>Helium</subject><subject>Hydrocarbons</subject><subject>Other chromatographic methods</subject><issn>0003-2700</issn><issn>1520-6882</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNpl0ctu1DAUBmALgehQWPACKEIgxCLgS2LHSxRaBmkQRR3E0jrxhbpN4tROpM7bYzTTqQQr3z4d_T4HoZcEfyCYko-gZY0lpbtHaEVqikveNPQxWmGMWUkFxifoWUrXGBOCCX-KTijhRJKGr9DtmXNWz0Vwxdr2fhkKP97v1hZMmkDbooXYhbH47MOdN_m46_1obExFvrwAfWNN2YZ-Gcbicpls1NHPXkNfnPeLN0V7FcMAc_gdYbraPUdPHPTJvjisp-jn-dm2XZeb71--tp82JVSYzyXHpANDpZG8Zp0jHRYc58yd5QRYbVhnpbWsZk4wUzegNdPCigYcpbzSDTtF7_Z1pxhuF5tmNfikbd_DaMOSVMOlkDWhIsvX_8jrsMQxh1OUiIZTUeGM3u-RjiGlaJ2aoh8g7hTB6u8U1HEK2b46FFy6wZqjvG97Bm8OAFLuk4swap8enJQVpSSzcs98mu3d8RnijeKCiVptLy7V9ttG_vrRMlVl_3bvQaeHP_yf7w-PZKm2</recordid><startdate>19960301</startdate><enddate>19960301</enddate><creator>Leichter, Eric</creator><creator>Strode, J. 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Thompson B ; Taylor, Larry T ; Schweighardt, Frank K</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a406t-601bad29d9653bf1b0760918be61a35d3be9ee353f73d58acc3c7e78af2264c83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><topic>Analytical chemistry</topic><topic>Carbon dioxide</topic><topic>Chemistry</topic><topic>Chromatographic methods and physical methods associated with chromatography</topic><topic>Exact sciences and technology</topic><topic>Helium</topic><topic>Hydrocarbons</topic><topic>Other chromatographic methods</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Leichter, Eric</creatorcontrib><creatorcontrib>Strode, J. 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Thompson B</au><au>Taylor, Larry T</au><au>Schweighardt, Frank K</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of Helium in Helium Headspace Carbon Dioxide Cylinders on Packed-Column Supercritical Fluid Chromatography</atitle><jtitle>Analytical chemistry (Washington)</jtitle><addtitle>Anal. Chem</addtitle><date>1996-03-01</date><risdate>1996</risdate><volume>68</volume><issue>5</issue><spage>894</spage><epage>898</epage><pages>894-898</pages><issn>0003-2700</issn><eissn>1520-6882</eissn><coden>ANCHAM</coden><abstract>Supercritical fluid chromatography of PAHs was performed with pure carbon dioxide and helium headspace carbon dioxide at various cylinder fill levels. The retention times of the PAHs increased when helium headspace carbon dioxide was used as a carrier fluid relative to pure carbon dioxide. The increased retention times were affected by the level of the liquid phase present in the helium headspace carbon dioxide cylinder. As more liquid phase was removed from the cylinder, the effect of helium on the solvating power of CO2 was reduced because the relative amount of helium dissolved in the liquid phase decreased. Furthermore, the effect of helium headspace carbon dioxide was investigated with methanol-modified carbon dioxide mobile phases for the analysis of steroids. We observed that the relative solubility of helium in carbon dioxide resulted in longer retention times when compared to pure carbon dioxide as the liquid level of carbon dioxide decreased.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>21619186</pmid><doi>10.1021/ac950922y</doi><tpages>5</tpages></addata></record> |
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| ispartof | Analytical chemistry (Washington), 1996-03, Vol.68 (5), p.894-898 |
| issn | 0003-2700 1520-6882 |
| language | eng |
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| source | American Chemical Society (ACS) Journals |
| subjects | Analytical chemistry Carbon dioxide Chemistry Chromatographic methods and physical methods associated with chromatography Exact sciences and technology Helium Hydrocarbons Other chromatographic methods |
| title | Effect of Helium in Helium Headspace Carbon Dioxide Cylinders on Packed-Column Supercritical Fluid Chromatography |
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