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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 335-344 |
| Number of pages | 10 |
| Journal | Marine Chemistry |
| Volume | 46 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1994 |
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ASJC Scopus subject areas
- Chemistry(all)
- Oceanography
Cite this
Reduction of chromium (VI) with hydrogen sulfide in NaCl media. / Pettine, M.; Millero, Frank J; Passino, R.
In: Marine Chemistry, Vol. 46, No. 4, 1994, p. 335-344.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Reduction of chromium (VI) with hydrogen sulfide in NaCl media
AU - Pettine, M.
AU - Millero, Frank J
AU - Passino, R.
PY - 1994
Y1 - 1994
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.
UR - http://www.scopus.com/inward/record.url?scp=0028317828&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028317828&partnerID=8YFLogxK
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 -