Stability constant studies on a new selective chelating agent for mercury(II)

Mark M. Jones, Alton J. Banks, C. Hendricks Brown

Research output: Contribution to journalArticle

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Abstract

A new chelating agent, phthalytetrathioacetic acid, (PTTA), has been characterized and found to be highly selective for Hg2+. All four of its ionization constants have been determined and the stability constants of its complexes with Hg2+, Ca2+, Zn2+, Co2+, Pb2+, Ni2+, and Cd2+ estimated. The mercury complex has a stability constant greater than those of the other complexes by a factor of at least 1010. The high selectivity for the Hg2+ ion is due to a closely spaced group of thioether sulfurs and a rather wide separation of the carboxylic acid groups which are potential members of chelate rings. The mercury complexes present in aqueous solution are Hg(PTTA)H2, log K = 18·8 at low pH and Hg(PTTA) (OH)2, log K = 45 at high pH. The presence of thioether, rather than thiol sulfur atoms has the result that the chelate with Pb2+ is of low stability.

Original languageEnglish
Pages (from-to)1833-1836
Number of pages4
JournalJournal of Inorganic and Nuclear Chemistry
Volume36
Issue number8
DOIs
StatePublished - Jan 1 1974

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Chelating Agents
Chelation
Mercury
Sulfides
Sulfur
chelates
acids
Acids
sulfur
Carboxylic Acids
Carboxylic acids
Sulfhydryl Compounds
thiols
carboxylic acids
Ionization
selectivity
Ions
aqueous solutions
ionization
Atoms

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Stability constant studies on a new selective chelating agent for mercury(II). / Jones, Mark M.; Banks, Alton J.; Hendricks Brown, C.

In: Journal of Inorganic and Nuclear Chemistry, Vol. 36, No. 8, 01.01.1974, p. 1833-1836.

Research output: Contribution to journalArticle

Jones, Mark M. ; Banks, Alton J. ; Hendricks Brown, C. / Stability constant studies on a new selective chelating agent for mercury(II). In: Journal of Inorganic and Nuclear Chemistry. 1974 ; Vol. 36, No. 8. pp. 1833-1836.
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