Stability constants for the formation of lead chloride complexes as a function of temperature and ionic strength

Yanxin Luo, Frank J. Millero

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29 Scopus citations

Abstract

The stability constants for the formation of lead (Pb2+) with chloridePb2 + + n Cl- ↔ PbCln2 - n βn (n = 1, 2, 3)have been determined using a spectrophotometric method in NaClO4 solutions as a function of ionic strength (0-6 m) and temperature (15-45 °C). The results have been fitted to the equations:{Mathematical expression}with standard errors of 0.05, 0.04 and 0.06, respectively. The thermodynamic values of log β1, log β2 and log β3 at 25.0 °C and the enthalpies of formation of PbCl+, PbCl20 and PbCl3- are in good agreement with literature values. We have combined our results with the earlier work of [Seward, T.M., 1984. The formation of lead (II) chloride complexes to 300 °C: a spectrophotometric study. Geochim. Cosmochim. Acta 48, 121-134.] Seward (1984) to yield thermodynamic constants that are valid from 15 to 300 °C:(log β1 =, 44.82 + 0.031 T - 21.21 log T; log β2 =, 61.42 + 0.046 T - 29.51 log T; log β3 =, 107.97 + 0.071 T - 51.46 log T)with standard errors of 0.05, 0.08 and 0.10, respectively.

Original languageEnglish (US)
Pages (from-to)326-334
Number of pages9
JournalGeochimica et Cosmochimica Acta
Volume71
Issue number2
DOIs
StatePublished - Jan 15 2007

ASJC Scopus subject areas

  • Geochemistry and Petrology

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