We have identified the intermediates and end products which are formed during the electrolytic degradation of thiocarbamate pesticides in aqueous NaCl solutions and investigated how the intermediate and end product volumes and ratios depend on reaction conditions. Further, we have defined both the reaction pathways leading to intermediate and end product formation and the methods affecting this process. The degradation of the molecular part containing the N atom is accounted for, as are the listed reactions and reaction pathways that affect degradation. If pH is changed, the ratio of degradation products NO 3 ) and N 2 can be influenced in favour of N 2 gas. This pH change can then be produced without additional material by changing the construction of an electroflotation cell. To implement degradation, ''flotation electrolysis'' has been found to be an effective method as it facilitates a regulated pH-shift, foam handling and gas bubble rising velocity. The efficiency of the method can be further enhanced by UV photolysis.
Electrochemical degradation of thiocarbamate active ingredients was investigated in aqueous NaCl solutions. Degradation was studied with spectrophotometric methods that allowed specific light absorptions of thiocarbamates (212-220 nm), HClO (236-238 nm) and Cl 2 (225-233 nm) to be periodically or continuously measured. Measurements were also done through chromatographic analysis. The results indicate that under the reaction conditions applied, the electrochemical degradation of thiocarbamates in NaCl solutions takes place not only on the electrode but mainly in the solution phase through 'indirect' electrolysis involving the intermediates of NaCl electrolysis (Cl 2 , HClO, ClO ) ). This degradation process can be controlled efficiently with the help of electrochemical reaction parameters.
The electrolytic destruction of thiocarbamates in NaCl solutions takes place mainly through indirect electrolysis with Cl 2 , HOCl, ClO ) and other oxidising species. The electrochemical destruction of thiocarbamates EPTC and Vernolate was studied in different Cl 2 , HOCl, ClO ) domains in chlorine-water equilibrium. Differences were found in both destruction rate and in intermediate and end products. Complete mineralisation can be achieved in ClO ) domain, where both total organic carbon (TOC) content and chemical oxygen demand (COD) are continuously decreasing and biodegradability is increasing during electrolysis. UV irradiation considerably accelerates the destruction process, i.e. the electrochemical destruction of thiocarbamate Vernolate.
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