Formation of haloacetamides during chlorination of dissolved organic nitrogen aspartic acid

Wen hai Chu, Nai yun Gao, Yang Deng

Research output: Contribution to journalArticleResearchpeer-review

43 Citations (Scopus)

Abstract

The stability of haloacetamides (HAcAms) such as dichloroacetamide (DCAcAm) and trichloroacetamide (TCAcAm) was studied under different experimental conditions. The yield of HAcAms during aspartic acid (Asp) chlorination was measured at different molar ratio of chlorine atom to nitrogen atom (Cl/N), pH and dissolved organic carbon (DOC) mainly consisted of humic acid (HA) mixture. Ascorbic acid showed a better capacity to prevent the decay of DCAcAm and TCAcAm than the other two dechlorinating agents, thiosulfate and sodium sulfite. Lower Cl/N favored the DCAcAm formation, implying that breakpoint chlorination might minimize its generation. The pH decrease could lower the concentration of DCAcAm but favored dichloroacetonitrile (DCAN) formation. DCAcAm yield was sensitive to the DOC due to higher chlorine consumption caused by HA mixture. Two possible pathways of DCAcAm formation during Asp chlorination were proposed. Asp was an important precursor of DCAN, DCAcAm and dichloroacetic acid (DCAA), and thus removal of Asp before disinfection may be a method to prevent the formation of DCAcAm, DCAN and DCAA.

Original languageEnglish
Pages (from-to)82-86
Number of pages5
JournalJournal of Hazardous Materials
Volume173
Issue number1-3
DOIs
StatePublished - 15 Jan 2010

Fingerprint

aspartic acid
dissolved organic nitrogen
Chlorination
Halogenation
chlorination
Aspartic Acid
Nitrogen
Dichloroacetic acid
Acids
Organic carbon
humic acid
Chlorine
dissolved organic carbon
chlorine
Dichloroacetic Acid
Humic Substances
Atoms
thiosulfate
Disinfection
Ascorbic acid

Keywords

  • DON
  • Drinking water
  • Formation mechanism
  • Haloacetamides
  • N-DBPs

Cite this

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title = "Formation of haloacetamides during chlorination of dissolved organic nitrogen aspartic acid",
abstract = "The stability of haloacetamides (HAcAms) such as dichloroacetamide (DCAcAm) and trichloroacetamide (TCAcAm) was studied under different experimental conditions. The yield of HAcAms during aspartic acid (Asp) chlorination was measured at different molar ratio of chlorine atom to nitrogen atom (Cl/N), pH and dissolved organic carbon (DOC) mainly consisted of humic acid (HA) mixture. Ascorbic acid showed a better capacity to prevent the decay of DCAcAm and TCAcAm than the other two dechlorinating agents, thiosulfate and sodium sulfite. Lower Cl/N favored the DCAcAm formation, implying that breakpoint chlorination might minimize its generation. The pH decrease could lower the concentration of DCAcAm but favored dichloroacetonitrile (DCAN) formation. DCAcAm yield was sensitive to the DOC due to higher chlorine consumption caused by HA mixture. Two possible pathways of DCAcAm formation during Asp chlorination were proposed. Asp was an important precursor of DCAN, DCAcAm and dichloroacetic acid (DCAA), and thus removal of Asp before disinfection may be a method to prevent the formation of DCAcAm, DCAN and DCAA.",
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Formation of haloacetamides during chlorination of dissolved organic nitrogen aspartic acid. / Chu, Wen hai; Gao, Nai yun; Deng, Yang.

In: Journal of Hazardous Materials, Vol. 173, No. 1-3, 15.01.2010, p. 82-86.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Chu, Wen hai

AU - Gao, Nai yun

AU - Deng, Yang

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N2 - The stability of haloacetamides (HAcAms) such as dichloroacetamide (DCAcAm) and trichloroacetamide (TCAcAm) was studied under different experimental conditions. The yield of HAcAms during aspartic acid (Asp) chlorination was measured at different molar ratio of chlorine atom to nitrogen atom (Cl/N), pH and dissolved organic carbon (DOC) mainly consisted of humic acid (HA) mixture. Ascorbic acid showed a better capacity to prevent the decay of DCAcAm and TCAcAm than the other two dechlorinating agents, thiosulfate and sodium sulfite. Lower Cl/N favored the DCAcAm formation, implying that breakpoint chlorination might minimize its generation. The pH decrease could lower the concentration of DCAcAm but favored dichloroacetonitrile (DCAN) formation. DCAcAm yield was sensitive to the DOC due to higher chlorine consumption caused by HA mixture. Two possible pathways of DCAcAm formation during Asp chlorination were proposed. Asp was an important precursor of DCAN, DCAcAm and dichloroacetic acid (DCAA), and thus removal of Asp before disinfection may be a method to prevent the formation of DCAcAm, DCAN and DCAA.

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