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In this work, the transfer of ametryn, prometryn and atrazine herbicides was studied through the interface of two immiscible electrolyte solutions (water 1,2-dichloroethane) using cyclic voltammetry and chronoamperometry techniques in a four electrode configuration cell. The experiments were carried out under acidic conditions to ensure protonation of the molecule and the formal transfer potential for the three herbicides was measured. The chronoamperometric results showed that diffusion coefficients values are in order of 10-6 cm² s-1, which are within the parameters obtained by cyclic voltammetry. The results suggest that the triazines move faster in the aqueous phase than in the organic phase. Thus, from an environmental point of view, these results could help to understand the transport of these compounds through a two-phase system, such as the membrane water from a biological cell. [ABSTRACT FROM AUTHOR]

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El cloro es mundialmente usado como desinfectante en concentraciones hasta 0.08 M. Éste estudio reporta la especiación del ión hipoclorito (OCl-) y el ácido hipocloroso (HOCl) por voltamperometría cíclica. Se comparan también cálculos teóricos con resultados experimentales para la curva de la fracción molar de HOCl (φHOCl) vs pH. La cronoamperometría efectuada con un minipolarógrafo de mínima instrumentación (MIMP) y una microcelda de bajo costo (Vmax = 350 µL) permite cuantificar la [OCl-] en el intervalo de 0.005 M a 0.030 M. Se observó que el no enjuagar la tela con la que se efectúa la desinfección, provoca una disminución de concentración de OCl- 3.7 a 4.6 mayor que cuando se enjuaga ésta. [ABSTRACT FROM AUTHOR]