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Detection methods of organic acid in steam/water circuits and optimisation using HPLC-UV

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dc.contributor.advisor Moodley, Kandasamy Govindsamy
dc.contributor.advisor Chetty, Deenadayalan Kisen Ramrung, Arthi 2010-11-18T10:07:15Z 2012-09-01T22:20:06Z 2009
dc.identifier.other 332135
dc.description Dissertation presented in partial compliance with the requirements for the Masters Degree in Technology: Chemistry, Durban University of Technology, 2009. en_US
dc.description.abstract This study was mainly a response to a challenge faced by ESKOM in its coal-fired power stations. In spite of using high purity water to drive the turbines, the latter were damaged by ‘pitting’, possibly related to acids generated at high temperatures. In the light of this a relatively simple method for determination of short chain organic acids was identified by comparing the efficacies of several methods. It was found that high performance liquid chromatography (HPLC) method preceded by derivatization (with o-nitrophenyl hydrazine) is suitable for analyzing mixtures of simple acids at ppb levels. Calibration was effected by using methanoic acid (formic acid), ethanoic acid (acetic acid), propanoic acid (propionic acid) and butanoic acid (butyric acid). The HPLC instrument used was from Thermo Separations with P2000 pump, SN 4000 interface and UV1000 with a column heater. A comparative study between the HPLC methods using ion exclusion and partition chromatography was carried out in order to find a suitable method that can be used with aqueous environmental samples. The two essential columns that were used were ion exclusion Phenomenex Rezex OA column and a Nucleodur C8 column. The method of partition chromatography using a C8 column showed the most success using a mobile phase consisted of acidified water using HCl (pH4.5) along with a 60:40 Acetonitrile/Methanol mixture. Both isocratic and gradient programs were utilized. Limits of detection were improved from 800ppb (formic acid), 480ppb (acetic), 350ppb (propionic) and 680ppb (butyric acid) to 25ppb (acetic), 60ppb (propionic) and 90ppb (butyric). Samples used in analysis were collected from the main stream, economiser, condensers, polishing plant and turbines of the Tutuka Power Station in Mpumalanga province and analysed using with final developed method en_US
dc.description.sponsorship Eskom Tertiary Support Programme. Durban University of Technology en_US
dc.format.extent 181 p en_US
dc.language.iso en en_US
dc.subject.lcsh High performance liquid chromatography en_US
dc.subject.lcsh Organic acids en_US
dc.subject.lcsh Coal-fired power plants en_US
dc.title Detection methods of organic acid in steam/water circuits and optimisation using HPLC-UV en_US
dc.type Thesis en_US
dc.dut-rims.pubnum DUT-000368

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