Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/j.cej.2021.129526 |
| Document | accepted manuscript |
| Title (Primary) | Compound specific isotope analysis to characterize degradation mechanisms of p-chloroaniline by persulfate at ambient temperature |
| Author | Min, N.; Yao, J.; Amde, M.; Tang, C.; Wu, L.; Richnow, H.H.; Chen, Y.; Cui, Y.; Li, H. |
| Source Titel | Chemical Engineering Journal |
| Year | 2021 |
| Department | ISOBIO |
| Volume | 419 |
| Page From | art. 129526 |
| Language | englisch |
| Topic | T7 Bioeconomy |
| Keywords | P-Chloroaniline; Persulfate; Chemical oxidation; Compound-specific isotope analysis; Isotope fractionation |
| Abstract | Compound-specific isotope analysis (CSIA) is a useful technique that has
received an increasing attention for studying the degradation
mechanisms of organic contaminants based on stable isotope fractionation
concepts. This study reports the degradation mechanisms of p-chloroaniline (PCA) at different pH values (3, 5, 7 and 9) induced by persulfate (PS) based on 13C isotope fractionation during its preferential oxidation with SO4 − and OH.
The results showed that the degradation of PCA followed first-order
kinetics (rate constants, 0.026, 0.0362, 0.0754 and 0.0497 h−1
at pH = 3, 5, 7 and 9, respectively), with the fastest degradation
under neutral conditions (pH 7). The degradation rate was found to be
higher under alkaline conditions (pH 9) compared to acidic conditions
(pH 3 and 5). A normal carbon isotope fractionation of PAC was observed
under neutral and alkaline conditions (eg., εC = −0.8‰ ±0.10 at pH 7 and εC = −1.0‰ ±0.17 at pH 9). However, a reverse carbon isotope effect at pH 3 (εC = 0.6‰ ±0.07) and pH 5 (εC = 1.1‰
±0.06) was observed, respectively. Based on the identified
transformation products and the insights revealed by CSIA, the
degradation pathways were proposed. The current findings are crucial in
understanding the PCA degradation mechanisms with SO4− and OH in aqueous systems. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=24434 |
| Min, N., Yao, J., Amde, M., Tang, C., Wu, L., Richnow, H.H., Chen, Y., Cui, Y., Li, H. (2021): Compound specific isotope analysis to characterize degradation mechanisms of p-chloroaniline by persulfate at ambient temperature Chem. Eng. J. 419 , art. 129526 10.1016/j.cej.2021.129526 |
|