With the aim to identify the reaction by-products, the oxidation of four sulfur-containing s-triazines (prometryne, terbutryne, ametryne and desmetryne) by sodium hypochlorite (NaClO) has been investigated using oxidant and herbicides initial concentrations respectively of 11 ppm and 3 ppm. Furthermore, to study the effect of reagent concentration on the oxidation rate, only for prometryne, the reaction has been carried out at two more oxidant and herbicide initial concentrations (ppm): 3 and 0.003, 0.011 and 0.003. Oxidation reactions were monitored by high performance liquid chromatography (HPLC), while the identification of by-products was at first carried out by HPLC-mass spectrometry (HPLC-MS) and then confirmed by accurate mass measurements. The results indicate that all the investigated triazines react in the same way. In the experimental conditions (T = 20°C, pH = 8, reaction time = 48 h) the reaction gives rise to three identified oxidation by-products: the sulfoxide, the sulfone and the sulfone's hydrolysis product. As expected, the lower the reagent's concentration the slower the oxidation rate. Based on the obtained results, a general pathway for the oxidation of sulfur-containing s-triazines is proposed.
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Research Article|
October 01 1994
Oxidation of sulfur-containing s-triazines during groundwater hypochlorination
A. Lopez;
A. Lopez
*Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque, Via F. De Blasio, 570123 Bari, Italy
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G. Mascolo;
G. Mascolo
*Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque, Via F. De Blasio, 570123 Bari, Italy
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G. Tiravanti;
G. Tiravanti
*Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque, Via F. De Blasio, 570123 Bari, Italy
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M. Santori;
M. Santori
**Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque, Via Reno, 100198 Roma, Italy
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R. Passino
R. Passino
**Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque, Via Reno, 100198 Roma, Italy
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Water Sci Technol (1994) 30 (7): 53–59.
Citation
A. Lopez, G. Mascolo, G. Tiravanti, M. Santori, R. Passino; Oxidation of sulfur-containing s-triazines during groundwater hypochlorination. Water Sci Technol 1 October 1994; 30 (7): 53–59. doi: https://doi.org/10.2166/wst.1994.0304
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