Reduction of chromium (VI) with hydrogen sulfide in NaCl media

M. Pettine; F. J. Millero; R. Passino

doi:10.1016/0304-4203(94)90030-2

Reduction of chromium (VI) with hydrogen sulfide in NaCl media

M. Pettine, F. J. Millero, R. Passino

Ocean Sciences

Research output: Contribution to journal › Article › peer-review

98 Scopus citations

Abstract

The rates of reduction of chromium (VI) to chromium (III) with H₂S in NaCl solutions have been measured as a function of temperature (15-50°C). pH (7.5-10.5) and ionic strength (0-2 M). The overall rate constant (k, M^-1 min^-1) in: d[Cr(VI)] dt=-k[Cr(VI)][H₂S]_T can be determined from (SD=0.07 in log k): logk = 16019-1.06pH - 2300.9 T where the ionic strength term has been overlooked because it does not significantly affect the kinetics. The energy of activation is 43.6 ± 1.5 kJmol^-1. The rates of reduction in real seawater samples appeared to be 2-3 times faster than in NaCl at the same ionic strength. Based on these kinetic measurements, half times of Cr(VI) range from few hours (4-6 h) to many days (160-250 d), respectively, at 1 mM or 1μM or H₂S_T in anoxic waters.

Original language	English (US)
Pages (from-to)	335-344
Number of pages	10
Journal	Marine Chemistry
Volume	46
Issue number	4
DOIs	https://doi.org/10.1016/0304-4203(94)90030-2
State	Published - Jul 1994

ASJC Scopus subject areas

Oceanography
Chemistry(all)
Environmental Chemistry
Water Science and Technology

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10.1016/0304-4203(94)90030-2

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@article{9605a4fb45274088ad7fc22554c9c436,

title = "Reduction of chromium (VI) with hydrogen sulfide in NaCl media",

abstract = "The rates of reduction of chromium (VI) to chromium (III) with H2S in NaCl solutions have been measured as a function of temperature (15-50°C). pH (7.5-10.5) and ionic strength (0-2 M). The overall rate constant (k, M-1 min-1) in: d[Cr(VI)] dt=-k[Cr(VI)][H2S]T can be determined from (SD=0.07 in log k): logk = 16019-1.06pH - 2300.9 T where the ionic strength term has been overlooked because it does not significantly affect the kinetics. The energy of activation is 43.6 ± 1.5 kJmol-1. The rates of reduction in real seawater samples appeared to be 2-3 times faster than in NaCl at the same ionic strength. Based on these kinetic measurements, half times of Cr(VI) range from few hours (4-6 h) to many days (160-250 d), respectively, at 1 mM or 1μM or H2ST in anoxic waters.",

author = "M. Pettine and Millero, {F. J.} and R. Passino",

note = "Funding Information: F.J. Millero wishes to acknowledge the support of the Office of Naval Research and the Oceanographic Section of the National Science Foundation for supporting his efforts.",

year = "1994",

month = jul,

doi = "10.1016/0304-4203(94)90030-2",

language = "English (US)",

volume = "46",

pages = "335--344",

journal = "Marine Chemistry",

issn = "0304-4203",

publisher = "Elsevier",

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T1 - Reduction of chromium (VI) with hydrogen sulfide in NaCl media

AU - Pettine, M.

AU - Millero, F. J.

AU - Passino, R.

N1 - Funding Information: F.J. Millero wishes to acknowledge the support of the Office of Naval Research and the Oceanographic Section of the National Science Foundation for supporting his efforts.

PY - 1994/7

Y1 - 1994/7

N2 - The rates of reduction of chromium (VI) to chromium (III) with H2S in NaCl solutions have been measured as a function of temperature (15-50°C). pH (7.5-10.5) and ionic strength (0-2 M). The overall rate constant (k, M-1 min-1) in: d[Cr(VI)] dt=-k[Cr(VI)][H2S]T can be determined from (SD=0.07 in log k): logk = 16019-1.06pH - 2300.9 T where the ionic strength term has been overlooked because it does not significantly affect the kinetics. The energy of activation is 43.6 ± 1.5 kJmol-1. The rates of reduction in real seawater samples appeared to be 2-3 times faster than in NaCl at the same ionic strength. Based on these kinetic measurements, half times of Cr(VI) range from few hours (4-6 h) to many days (160-250 d), respectively, at 1 mM or 1μM or H2ST in anoxic waters.

AB - The rates of reduction of chromium (VI) to chromium (III) with H2S in NaCl solutions have been measured as a function of temperature (15-50°C). pH (7.5-10.5) and ionic strength (0-2 M). The overall rate constant (k, M-1 min-1) in: d[Cr(VI)] dt=-k[Cr(VI)][H2S]T can be determined from (SD=0.07 in log k): logk = 16019-1.06pH - 2300.9 T where the ionic strength term has been overlooked because it does not significantly affect the kinetics. The energy of activation is 43.6 ± 1.5 kJmol-1. The rates of reduction in real seawater samples appeared to be 2-3 times faster than in NaCl at the same ionic strength. Based on these kinetic measurements, half times of Cr(VI) range from few hours (4-6 h) to many days (160-250 d), respectively, at 1 mM or 1μM or H2ST in anoxic waters.

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U2 - 10.1016/0304-4203(94)90030-2

DO - 10.1016/0304-4203(94)90030-2

M3 - Article

AN - SCOPUS:0028317828

VL - 46

SP - 335

EP - 344

JO - Marine Chemistry

JF - Marine Chemistry

SN - 0304-4203

IS - 4

ER -

Reduction of chromium (VI) with hydrogen sulfide in NaCl media

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