Validación del método analítico BTEX por GC con diferentes matrices en el laboratorio LABSU

Abstract

This research was carried out at the LABSU Environmental Laboratory, province of Orellana in order to authenticate BTEX by gas chromatography in different matrices, guaranteeing the reliability of the results obtained from the test. The validation of BTEX (Benzene, Toluene, Ethylbenzene and Xylene) in individual components in the water matrix was developed based on EPA METHOD 5030C, 2003 on soil matrices for individual components and emissions to the global atmosphere, using EPA METHOD 5035A, 2003. The liquid manual injection method was developed with the "SRI Instruments 8610C Gas Chromatography Systems" has a linear response with an r greater than 0.995 per calibration curve for the analyzed compounds. The limits of detection, quantification and work interval were estimated for the different matrices with respect to each component and by BTEX summation. The %CV in water for reproducibility and repeatability of 16% Benzene, 7% Toluene, 5% Ethylbenzene, 5% m, p-Xylene and 6% o-Xylene for soil 8% Benzene, 8% Toluene, 8% Ethylbenzene, 8% m, p-Xylene and 9% o- Xylene and in emissions to the atmosphere less than 7%. The U method for the water matrix 37% Benzene, 21% Toluene, 22% Ethylbenzene, 15% m, p-Xylene and 22% o-Xylene in soil 28% Benzene, 29% Toluene, 28% Ethylbenzene, 24% m, p-Xylene and 24% o-Xylene and BTEX in emissions to the atmosphere 32% at all levels with 95% confidence interval, being a reliable and reproducible test through the guidelines established by the laboratory. It is important to carry out inter-laboratory tests for each parameter, although in emissions to the atmosphere so far there is no tests to carry out this action.