Comparative Analytical Methods for the Measurment of Chlorine Dioxide

dc.contributor.authorDesai, Unmesh Jeetendraen
dc.contributor.committeecochairHoehn, Robert C.en
dc.contributor.committeecochairDietrich, Andrea M.en
dc.contributor.committeememberEdwards, Marc A.en
dc.contributor.committeememberLittle, John C.en
dc.contributor.departmentEnvironmental Engineeringen
dc.date.accessioned2014-03-14T20:41:51Zen
dc.date.adate2002-07-30en
dc.date.available2014-03-14T20:41:51Zen
dc.date.issued2002-06-10en
dc.date.rdate2003-07-30en
dc.date.sdate2002-07-24en
dc.description.abstractFour commercially available methods used for the analysis of low-level Chlorine Dioxide (ClO2) concentrations in drinking water were evaluated for accuracy and precision and ranked according to cost, efficiency and ease of the methods under several conditions that might be encountered at water treatment plants. The different analytical methods included: 1.The DPD (N, N-diethyl-p-phenylenediamine) method 2.Lissamine Green B (LGB) wet-chemical method 3.Palintest® kit LGB 4.Amperometric titration All these tests were performed with standard 1.0 mg/L ClO2 either alone or in the presence of different chlorine species, including chlorite ion (ClO2-, 0.5 mg/L), chlorate ion (ClO3-, 0.5 mg/L) and chlorine (Cl2, 1.0 mg/L). The tests were performed with four different matrices, with different concentrations of 0.1 mg/L ClO2, 0.5 mg/L ClO2 and 1.0 mg/L ClO2 at a constant temperature of 20oC and at different temperatures of 0oC, 10oC and 20oC at a fixed ClO2 concentration of 1.0 mg/L. None of the four methods produced the desired level of either accuracy or precision. For all four methods, interference to the measured ClO2 concentration from the addition of ClO2-, ClO3-, and Cl2 was minimal when the methods were performed according to specifications. The Palintest® was the best all-round method because it was easy to perform, performed well at all concentrations tested, and its colored product was stable. The HACH® DPD method was also easy to perform and gave the best results when measuring concentrations of 1.0 mg/L ClO2. The DPD method was less accurate than the Palintest® at lower concentrations. The DPD colored product that formed upon reaction of ClO2 and DPD was unstable, making it necessary to measure the intensity of the colored product at exactly 1 minute. The amperometric titration and lissamine green methods were more cumbersome and time-consuming to perform than either the DPD or Palintest® methods; for this reason they are less desirable for routine use.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-07242002-111511en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07242002-111511/en
dc.identifier.urihttp://hdl.handle.net/10919/34134en
dc.publisherVirginia Techen
dc.relation.haspartThesisDraft.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAnalytical Methodsen
dc.subjectChlorateen
dc.subjectChloriteen
dc.subjectChlorine Dioxideen
dc.titleComparative Analytical Methods for the Measurment of Chlorine Dioxideen
dc.typeThesisen
thesis.degree.disciplineEnvironmental Planningen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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