{"id":1770,"date":"2014-03-31T13:32:00","date_gmt":"2014-03-31T13:32:00","guid":{"rendered":"https:\/\/chempublishers.sourcingoutfit.com\/?p=1770"},"modified":"2025-06-14T06:48:20","modified_gmt":"2025-06-14T06:48:20","slug":"pjc-0714","status":"publish","type":"post","link":"https:\/\/chempublishers.com\/Pakistan-journal-of-chemistry\/2014\/03\/31\/pjc-0714\/","title":{"rendered":"GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1770\" class=\"elementor elementor-1770\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-84416ba e-flex e-con-boxed e-con e-parent\" data-id=\"84416ba\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-57ab532 e-con-full e-flex e-con e-child\" data-id=\"57ab532\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d4fbaa6 elementor-widget elementor-widget-text-editor\" data-id=\"d4fbaa6\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<table border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\" align=\"center\">\n<tbody>\n<tr>\n<td>\n<div><strong>Research Article | Open Access<\/strong><\/div>\n<div class=\"item doi\"><span class=\"value\">Volume 4 | Issue 1 |&nbsp;<a href=\"https:\/\/chempublishers.com\/Pakistan-journal-of-chemistry\/wp-content\/uploads\/sites\/2\/2025\/01\/PJC-v04.i01.p07.pdf\" target=\"_blank\" rel=\"noopener\">https:\/\/doi.org\/10.15228\/2014.v04.i01.p07<\/a><\/span><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<article class=\"obj_article_details\">\n<h4>GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue<\/h4>\n<div class=\"row\">\n<div class=\"main_entry\">\n<p><span class=\"name\">M. Qadri<\/span><\/p>\n<p>Photochemistry Research Lab, Department of Chemistry, University of Karachi, Pakistan<\/p>\n<p><span class=\"name\">F. Uddin<\/span><\/p>\n<p>Photochemistry Research Lab, Department of Chemistry, University of Karachi, Pakistan<\/p>\n<p><span class=\"name\">R. Azmat<\/span><\/p>\n<p>Photochemistry Research Lab, Department of Chemistry, University of Karachi, Pakistan<\/p>\n<p><\/p>\n<table border=\"0\" width=\"93%\" cellspacing=\"0\" cellpadding=\"0\" align=\"center\">\n<tbody>\n<tr>\n<td align=\"center\" valign=\"top\"><strong>Received<\/strong><br>16 Mar, 2014<\/td>\n<td align=\"center\" valign=\"top\"><strong>Accepted<\/strong><br>06 Sep, 2014<\/td>\n<td align=\"center\" valign=\"top\"><strong>Published<\/strong><br>06 Dec, 2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"item abstract\">\n<p class=\"ql-align-justify\">Thecurrent study describes the interactive role of diethylthiourea on the bleaching of toluidine blue (tolonium chloride) (TB<sup>+<\/sup>&nbsp;) in acidic and basic media using the GC Mass Chromatography and Spectrophotometric technique. GC-Mass Spectrophotometric analysis was carried out to verify the decoloration of dye whether the bleaching of dye owed to leuco dye formation or degradation may also occur in the reaction mixture. The dye redox reaction process followed first order kinetics with respect to TB, DETU showed first order mechanism, first order kinetics with respect to H+ . Enhanced decoloration in the presence of DETU proved that reductant\u2018s role is pivotal in the redox reaction. Slow decoloration in basic medium with ions was seen compared to acidic media, suggesting that pH of the medium is significant in the oxidation of DETU. The bleaching reaction of dye was investigated at different temperatures. At pH of 1.0 and 25<sup>0<\/sup>C, the order of reaction is found to be second having rate constant value of 15.81 mol<sup>-1<\/sup>&nbsp;.L s<sup>&#8211;<\/sup>1 ,and rate law is suggested to be -d\/dt [TBH ] = k<sub>2<\/sub>&nbsp;[TB+ H + ][DETU].Different reaction energy parameters were evaluated for a TB+ -DETU reaction, including the energy of activation (E<sub>a<\/sub>&nbsp;= 60.786 kJ mol<sup>-1<\/sup>&nbsp;(basic medium), 1.669kJmol<sup>-1<\/sup>&nbsp;(acidic medium)), enthalpy of activation (\u2206H<sup>\u2260<\/sup>&nbsp;= -58.267 kJ mol-1 (basic medium), -12.6kJ mol-1 (acidic medium)), entropy of activation (\u2206S<sup>\u2260<\/sup>&nbsp;= -131.525Jmol<sup>-1<\/sup>K<sup>-1<\/sup>&nbsp;(basic medium),-243 Jmol<sup>-1<\/sup>K<sup>-1<\/sup>&nbsp;(acidic medium)),and free energy of activation (\u2206G<sup>\u2260<\/sup>&nbsp;= &#8211; 98.119kJmol<sup>-1<\/sup>&nbsp;(basic medium) and -86.55kJmol<sup>-1<\/sup>&nbsp;(acidic medium). A mechanism of interaction of involved ions in dye bleaching and a mechanism of oxidation based on the above findings is proposed.<\/p>\n<\/div>\n<div class=\"item abstract\">\n<div>\n<h3 class=\"label\">How to Cite this paper?<\/h3>\n<div class=\"csl-entry\">\n<p><strong>APA-7 Style<\/strong><br>Qadri, M., Uddin, F., Azmat, R. (2014). GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue<br>.&nbsp;<a href=\"https:\/\/doi.org\/10.15228\/2014.v04.i01.p07\" target=\"_blank\" rel=\"noopener\"><em>Pakistan Journal of Chemistry<\/em>, 4(1), 39-48<\/a>. https:\/\/doi.org\/10.15228\/2014.v04.i01.p07<\/p>\n<p><strong>ACS Style<\/strong><br>Qadri, M.; Uddin, F.; Azmat, R. GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue<br>.&nbsp;<a href=\"https:\/\/doi.org\/10.15228\/2014.v04.i01.p07\" target=\"_blank\" rel=\"noopener\"><em>Pak. J. Chem.<\/em>&nbsp;2014, 4, 39-48<\/a>. https:\/\/doi.org\/10.15228\/2014.v04.i01.p07<\/p>\n<p><strong>AMA Style<\/strong><br>Qadri M, Uddin F, Azmat R. GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue<br>.&nbsp;<a href=\"https:\/\/doi.org\/10.15228\/2014.v04.i01.p07\" target=\"_blank\" rel=\"noopener\"><em>Pakistan Journal of Chemistry<\/em>. 2014; 4(1): 39-48<\/a>. https:\/\/doi.org\/10.15228\/2014.v04.i01.p07<\/p>\n<p><strong>Chicago\/Turabian Style<\/strong><br>Qadri, M., F. Uddin, and R. Azmat. 2014. &#8220;GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue<br>&#8221;&nbsp;<a href=\"https:\/\/doi.org\/10.15228\/2014.v04.i01.p07\" target=\"_blank\" rel=\"noopener\"><em>Pakistan Journal of Chemistry<\/em>&nbsp;4, no. 1: 39-48<\/a>. https:\/\/doi.org\/10.15228\/2014.v04.i01.p07<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"item copyright\">\n<p><a href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\" rel=\"license\"><img decoding=\"async\" src=\"https:\/\/i.creativecommons.org\/l\/by\/4.0\/88x31.png\" alt=\"Creative Commons License\"><\/a><\/p>\n<p>This work is licensed under a&nbsp;<a href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\" rel=\"license\">Creative Commons Attribution 4.0 International License<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c35f922 e-con-full e-flex e-con e-child\" data-id=\"c35f922\" data-element_type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Research Article | Open Access Volume 4 | Issue 1 |&nbsp;https:\/\/doi.org\/10.15228\/2014.v04.i01.p07 GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue M. Qadri Photochemistry Research Lab, Department of Chemistry, University of Karachi, Pakistan F. Uddin Photochemistry Research Lab, Department of Chemistry, University of Karachi, Pakistan R. Azmat Photochemistry Research Lab, Department [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1770","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue - Pakistan Journal of Chemistry<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/chempublishers.com\/Pakistan-journal-of-chemistry\/2014\/03\/31\/pjc-0714\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue - Pakistan Journal of Chemistry\" \/>\n<meta property=\"og:description\" content=\"Research Article | Open Access Volume 4 | Issue 1 |&nbsp;https:\/\/doi.org\/10.15228\/2014.v04.i01.p07 GC-Mass Spectrokinetics Study of Probable Mechanism of the Oxidation of Diethylthiourea with Toluidine Blue M. 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