Abstract
This paper focuses on the abiotic reduction of selenite (Se(IV)) by cysteine (Cys, NH3 +CH(CH2SH)COOH), which is a representative thiol produced by aquatic organism under oxidative stress. The rates of reduction of Se(IV) by cysteine were measured in deaerated NaCl solutions and natural waters as a function of pH (4.0-9.0), temperature (10-40°C), and ionic strength (0.01-1.0M). The rates showed a complex dependence on pH with similar values from pH 4.0-5.0, increasing values from pH 5.0-7.0 and then decreasing values at pH higher than 7.0. An apparent energy of activation obtained was 31±6kJmol-1, which was independent of ionic strength.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 98-108 |
| Number of pages | 11 |
| Journal | Geochimica et Cosmochimica Acta |
| Volume | 124 |
| DOIs | |
| State | Published - Jan 1 2014 |
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ASJC Scopus subject areas
- Geochemistry and Petrology
Cite this
Reduction of selenite by cysteine in ionic media. / Gennari, Francesca; Sharma, Virender K.; Pettine, Maurizio; Campanella, Luigi; Millero, Frank J.
In: Geochimica et Cosmochimica Acta, Vol. 124, 01.01.2014, p. 98-108.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Reduction of selenite by cysteine in ionic media
AU - Gennari, Francesca
AU - Sharma, Virender K.
AU - Pettine, Maurizio
AU - Campanella, Luigi
AU - Millero, Frank J
PY - 2014/1/1
Y1 - 2014/1/1
N2 - This paper focuses on the abiotic reduction of selenite (Se(IV)) by cysteine (Cys, NH3 +CH(CH2SH)COOH), which is a representative thiol produced by aquatic organism under oxidative stress. The rates of reduction of Se(IV) by cysteine were measured in deaerated NaCl solutions and natural waters as a function of pH (4.0-9.0), temperature (10-40°C), and ionic strength (0.01-1.0M). The rates showed a complex dependence on pH with similar values from pH 4.0-5.0, increasing values from pH 5.0-7.0 and then decreasing values at pH higher than 7.0. An apparent energy of activation obtained was 31±6kJmol-1, which was independent of ionic strength.
AB - This paper focuses on the abiotic reduction of selenite (Se(IV)) by cysteine (Cys, NH3 +CH(CH2SH)COOH), which is a representative thiol produced by aquatic organism under oxidative stress. The rates of reduction of Se(IV) by cysteine were measured in deaerated NaCl solutions and natural waters as a function of pH (4.0-9.0), temperature (10-40°C), and ionic strength (0.01-1.0M). The rates showed a complex dependence on pH with similar values from pH 4.0-5.0, increasing values from pH 5.0-7.0 and then decreasing values at pH higher than 7.0. An apparent energy of activation obtained was 31±6kJmol-1, which was independent of ionic strength.
UR - http://www.scopus.com/inward/record.url?scp=84886773645&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84886773645&partnerID=8YFLogxK
U2 - 10.1016/j.gca.2013.09.019
DO - 10.1016/j.gca.2013.09.019
M3 - Article
AN - SCOPUS:84886773645
VL - 124
SP - 98
EP - 108
JO - Geochmica et Cosmochimica Acta
JF - Geochmica et Cosmochimica Acta
SN - 0016-7037
ER -