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• W2072307232 abstract "This paper focuses on the abiotic reduction of selenite (Se(IV)) by cysteine (Cys, NH 3 + CH(CH 2 SH)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 (0.01–1.0 M). 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 ± 6 kJ mol −1 , which was independent of ionic strength. The reaction is due to the following interaction HSeO 3 - + H 2 Cys 0 ⇄ k - ST k ST [ ST ] → k Se ( 0 ) Products where the selenotrisulfide [ST] is the complex intermediate RS–Se–SR with R = NH 3 + CH(CH 2 )COO − . The intermediate ST then decomposes in the final products Se(0) and cystine. The pseudo-first-order rate constant is written as k 1 = k ST × 1 - k - ST k - ST + k Se ( 0 ) × α HSeO 3 - × α H 2 Cys 0 × [ Cys ] T where the second-order rate constant ( k ST ) was calculated as (2.0 ± 0.2) × 10 3 M −1 min −1 and was compared with the second-order rate constants of other reductants (hydrogen sulfide, ascorbic acid). In neutrality and alkaline solution, [ST] undergoes rapid decomposition and the term (1 − k −ST / k −ST + k Se(0) ) approximates 1 and may be neglected. k 1 = k ST × α HSeO 3 - × α H 2 Cys 0 × [ Cys ] T Environmental significance of the results and the importance of abiotic vs biotic reactions are also briefly discussed." @default.
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• W2072307232 date "2014-01-01" @default.
• W2072307232 modified "2023-09-27" @default.
• W2072307232 title "Reduction of selenite by cysteine in ionic media" @default.
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• W2072307232 doi "https://doi.org/10.1016/j.gca.2013.09.019" @default.
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