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Study of N-chloramine reactivity in ...

Bedner, Mary.

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Study of N-chloramine reactivity in chlorine-disinfected wastewater: Toward reduction of toxic residuals by more effective dechlorination.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Study of N-chloramine reactivity in chlorine-disinfected wastewater: Toward reduction of toxic residuals by more effective dechlorination./
Author:	Bedner, Mary.
Description:	217 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2642.
Contained By:	Dissertation Abstracts International64-06B.
Subject:	Chemistry, Analytical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3094454

Study of N-chloramine reactivity in chlorine-disinfected wastewater: Toward reduction of toxic residuals by more effective dechlorination.
Bedner, Mary.

Study of N-chloramine reactivity in chlorine-disinfected wastewater: Toward reduction of toxic residuals by more effective dechlorination. - 217 p.

Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2642.

Thesis (Ph.D.)--University of Maryland College Park, 2003.

N-chloramines, which are oxidants produced in chlorine-disinfected wastewaters, were determined using liquid chromatography (LC) and flow injection analysis (FIA). A detector selective for N-chloramines was constructed based on post column derivatization in acidic iodide solution followed by electrochemical detection of the I2/I3- product. N-chloramine recoveries were evaluated as a function of LC separation parameters, with the highest recoveries obtained using a reverse-phase (C18) column with a mobile phase consisting of 25--60% acetonitrile/aqueous phosphate solution (pH 7). The detection limits obtained are in the low 10-7 mol/L range, which is 10--1000 fold lower than total residual chlorine concentrations typically found in disinfected water and wastewater.Subjects--Topical Terms:

586156
Chemistry, Analytical.

Study of N-chloramine reactivity in chlorine-disinfected wastewater: Toward reduction of toxic residuals by more effective dechlorination.
LDR:03453nmm 2200289 4500 001 1859143
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008 130614s2003 eng d
035 $a (UnM)AAI3094454
035 $a AAI3094454
040 $a UnM $c UnM
100 1 $a Bedner, Mary. $3 1946808
245 1 0 $a Study of N-chloramine reactivity in chlorine-disinfected wastewater: Toward reduction of toxic residuals by more effective dechlorination.
300 $a 217 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2642.
500 $a Chair: George R. Helz.
502 $a Thesis (Ph.D.)--University of Maryland College Park, 2003.
520 $a N-chloramines, which are oxidants produced in chlorine-disinfected wastewaters, were determined using liquid chromatography (LC) and flow injection analysis (FIA). A detector selective for N-chloramines was constructed based on post column derivatization in acidic iodide solution followed by electrochemical detection of the I2/I3- product. N-chloramine recoveries were evaluated as a function of LC separation parameters, with the highest recoveries obtained using a reverse-phase (C18) column with a mobile phase consisting of 25--60% acetonitrile/aqueous phosphate solution (pH 7). The detection limits obtained are in the low 10-7 mol/L range, which is 10--1000 fold lower than total residual chlorine concentrations typically found in disinfected water and wastewater.
520 $a To study more effective wastewater dechlorination, reduction rates of NH2Cl, N-Cl-piperidine, N-Cl-leucylalanine and N-Cl-alanylalanine were determined by a series of ten alternate dechlorination agents and compared to the commonly employed agent sulfite. Notably, reduction of N-chloroleucylalanine (N-Cl-LeuAla) by thiosulfate was approximately 3 times faster than by sulfite under controlled conditions, while ascorbic acid was found to be 5 times slower. When present in ten times molar excess, iodide was found to be a redox mediator for reduction of N-Cl-LeuAla by sulfite. A packed bed of metallic iron completely reduced N-Cl-LeuAla within 20 sec. A surface-normalized rate constant for reduction by iron was found to be 0.0015 L min-1 m -2 at pH 7.4.
520 $a Wastewater samples were collected from a municipal treatment facility and evaluated by LC and FIA. Although individual identities were not determined in LC, wastewater N-chloramine products could be roughly grouped by size and hydrophobicity. Compounds that are hydrophilic and have molecular weights less than 2200 daltons were found to be quickly (<2 min) chlorinated and quickly dechlorinated. Conversely, compounds that are moderately to very hydrophobic and have molecular weights greater than 2200 daltons were found to be slowly chlorinated and slowly dechlorinated. This behavior was observed for all five dechlorination agents evaluated on wastewater samples. Thiosulfate, iron metal, and iodide mediation of sulfite were kinetically more effective dechlorinating agents than sulfite alone. The compounds that were slowly chlorinated/dechlorinated in wastewater exhibit behavior that is similar to the model peptide N-chloramines investigated.
590 $a School code: 0117.
650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Environmental Sciences. $3 676987
690 $a 0486
690 $a 0768
710 2 0 $a University of Maryland College Park. $3 1249734
773 0 $t Dissertation Abstracts International $g 64-06B.
790 1 0 $a Helz, George R., $e advisor
790 $a 0117
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3094454