{"id":5126,"date":"2024-08-13T07:28:00","date_gmt":"2024-08-13T07:28:00","guid":{"rendered":"http:\/\/121.199.166.88\/?post_type=resources&#038;p=5126"},"modified":"2024-12-06T18:02:16","modified_gmt":"2024-12-06T18:02:16","slug":"accuracy-of-vapor-dosing-with-the-autochem","status":"publish","type":"resources","link":"https:\/\/micromeritics.com.cn\/en\/resources\/accuracy-of-vapor-dosing-with-the-autochem\/","title":{"rendered":"Accuracy of Vapor Dosing with the AutoChem"},"content":{"rendered":"\n<p>The Vapor Generator option for the AutoChem provides a means to quantitatively inject pulsed dose amounts of vapor onto a solid sample. Vapors of most interest are actually gases below their critical temperature; hence, they are condensable. Design features and operation of the AutoChem\u2019s vapor generator are described in Product Bulletin 83.<\/p>\n\n\n\n<p>Reagent grade 2-propanol (boiling point 97 \u00b0C) was used to demonstrate the accuracy and reproducibility of the AutoChem and vapor generator for dosing vapor at a specific pressure. A series of three experiments was performed in which 15 repeated pulses of 2-propanol were made from the vapor generator with an inert helium carrier gas. The three different vapor pressures were obtained using reflux zone temperatures of 60, 70, and 80 \u00b0C.<\/p>\n\n\n\n<p>The conditions of the experiments were:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An empty sample tube; the furnace was maintained at 120 \u00b0C to prevent condensation of the alcohol in the tube.<\/li>\n\n\n\n<li>All compartments of the AutoChem were heated to 130 \u00b0C.<\/li>\n\n\n\n<li>Helium was used as the loop gas and the carrier\/reference gas.<\/li>\n\n\n\n<li>The boil-zone temperature of the vapor generator was held 20 \u00b0C higher than the reflux zone.<\/li>\n\n\n\n<li>A nominal 0.5-cc injection loop was employed. The exact volume of the loop at 130 \u00b0C was 0.3363 cc.<\/li>\n<\/ul>\n\n\n\n<p>Tables I, II and III show the integrated peak areas for all 15 injections at the three respective vapor reflux temperatures of 60, 70, and 80 \u00b0C.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"333\" src=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-Table1.png\" alt=\"\" class=\"wp-image-5127\" srcset=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-Table1.png 1000w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-Table1-300x100.png 300w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-Table1-768x256.png 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1000\" height=\"333\" src=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-table2.png\" alt=\"\" class=\"wp-image-5128\" srcset=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-table2.png 1000w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-table2-300x100.png 300w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-table2-768x256.png 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1000\" height=\"333\" src=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-table3.png\" alt=\"\" class=\"wp-image-5129\" srcset=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-table3.png 1000w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-table3-300x100.png 300w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/AppNote116-table3-768x256.png 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p>The three TCD traces are shown overlaid in Figure 1.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"499\" src=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/appnote116-figure1.png\" alt=\"\" class=\"wp-image-5130\" style=\"width:624px;height:auto\" srcset=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/appnote116-figure1.png 1000w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/appnote116-figure1-300x150.png 300w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/appnote116-figure1-768x383.png 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p><em>Figure 1.The time vs. signal outputs from the TCD detector for 15 sequential injections of 2-propanol vapor at three different reflux temperatures; (a) 60 \u00b0C, (b) 70 \u00b0C, and (c) 80 \u00b0C.<\/em><\/p>\n\n\n\n<p>The summary data are given in Table IV. The standard deviations for the integrated peak areas for the three different temperature series are all well below 1%. The active volume injected compares quite well with that expected from the known vapor pressure of the 2-propanol.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"277\" src=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/appnote116-table4.png\" alt=\"\" class=\"wp-image-5131\" srcset=\"https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/appnote116-table4.png 1000w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/appnote116-table4-300x83.png 300w, https:\/\/micromeritics.com.cn\/wp-content\/uploads\/2024\/08\/appnote116-table4-768x213.png 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"zero-opacity\">Accuracy of Vapor Dosing with the AutoChem<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Vapor Generator option for the AutoChem provides a means to quantitatively inject pulsed dose amounts of vapor onto a solid sample. Vapors of most interest are actually gases below their critical temperature; hence, they are condensable. Design features and operation of the AutoChem\u2019s vapor generator are described in Product Bulletin 83. Reagent grade 2-propanol [&hellip;]<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","meta":{"_acf_changed":true},"methods":[25],"resource_type":[8],"class_list":["post-5126","resources","type-resources","status-publish","hentry","methods-chemisorption","resource_type-application-notes"],"acf":[],"_links":{"self":[{"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/resources\/5126","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/resources"}],"about":[{"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/types\/resources"}],"wp:attachment":[{"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/media?parent=5126"}],"wp:term":[{"taxonomy":"methods","embeddable":true,"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/methods?post=5126"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/micromeritics.com.cn\/en\/wp-json\/wp\/v2\/resource_type?post=5126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}