Niveles de saneamiento para suelo con pasivos ambientales. Estimación de factores de exposición para México

Abstract

A central topic concerned with soil restorations actions is to get a confidence approach on the exposure risks levels that need to be controlled through the reduction or minimization of the concentrations of contaminant of interest. This study presents the characterization of most relevant exposure variables for Mexican people under potential risk of exposure at sites contaminated with hazardous wastes, in order to achieve more certainty on risk estimation. Data from an epidemiologic survey conducted at 11 rural Mexican communities, were used to develop empirical distribution functions to address the variability and diversity on temporal exposure variables and the body weight and height characteristics of the population of concern. The variability and uncertainty analysis of the Mexican values shows great divergence with the typical values based on the mean values for the American population. It is an evidence of the advantage of this initial approach to the variability of the most relevant exposure variables for countries like Mexico. As an example, the distribution function for exposure duration is used to develop soil cleanup levels at exposure scenario of soil contaminated with benzene by the application of probabilistic risk assessment and iterative truncation method.