Affiliation:
1. Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque, Via F. De Blasio, 570123 Bari, Italy
2. Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque, Via Reno, 100198 Roma, Italy
Abstract
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.
Subject
Water Science and Technology,Environmental Engineering
Cited by
11 articles.
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