Evaluación de riesgos químicos por Benceno, Tolueno y Xileno en los puestos críticos de los laboratorios de la Universidad Técnica de Ambato

Abstract

An evaluation analysis of volatile organic compounds (VOCs) produced by the different laboratories of the Technical University of Ambato was carried out using the Quality Norm for internal environments ISO 171330. Benzene, toluene, and xylene (BTX) were sampled using the Norm of UNE 689 Chemical Risk Assessment, measurement tests were carried out in the Physical-Chemical and Instrumental Analysis, General Chemistry, and Food Research Center laboratories for 90 working days. The BriD MX6 (direct-photoionized measurement) was used for the measurements. The exposure indices in parts per million (ppm) were: Instrumental Analysis: benzene 10.35, toluene 0.12, xylene: meta 0.08, ortho 0.07, para 0.08, General Chemistry: benzene 22.13, toluene 0.13, xylene: meta 0.17, ortho 0.17 and for 0.12; and the Food Research Center: benzene 17.74, toluene 0.14, xylene: meta 0.13, ortho 0.17 and for 0.15; determining a value of the total exposure index in ppm: Instrumental Analysis of 10.54, general chemistry of 22.71 and the Food Research Center 22.76. Exceeding the Recommended Environmental Limit Value (VLA). Finally, an attenuation system was developed calculating a total ventilation flow for each of the laboratories in cubic meters per hour. Laboratories use BTX in different concentrations, this causes its concentrations to vary. Finally, the total evaporation rate calculated in liters per hour was obtained. The parameters required by the Institute for Occupational Safety and Hygiene (INSHT) were used.by the Institute of Occupational Safety and Hygiene (INSHT) were used.