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Diclofenac (DCF) and Atrazine (ATZ) are pollutants, present in natural waters. To develop new technologies for the abatement of these compounds, it is necessary to develop fast and low cost methods for routine quantification. In this work, two fast and accurate methods for the simultaneous determination of DCF y ATZ in natural waters were developed. These methods are based in spectrophotometric second order derivative (SDS) and partial least-squares (PLS) multivariate calibration from UV-VIS spectroscopic data. Both methods were compared with chromatographic reference methods. Limit of detection (LOD), limit of quantification (LOQ) and recovery values obtained for river water sample were similar. In the case of DCF, the LOD ranged from 3×10 -8 (PLS)to 1×10 -7 (SDS), while for ATZ, LOD ranged from 1×10 -8 (PLS) to 3×10 -6 (GC-MS). For DCF, the LOQ ranged from 9×10 (PLS)to 9×10 -7 (HPLC-UV), while for ATZ, LOQ ranged from 4×10 -8 (PLS) to 5×10 -6 (GC-MS). For DCF, the recovery (%) ranges from 97 (SDS)to 106 (PLS), while for ATZ, recovery (%) ranges from 91 (PLS) to 99 (SDS).

SIMULTANEOUS DETERMINATION OF ATRAZINE AND SODIUM DICLOFENAC IN NATURAL WATER BY SPECTROPHOTOMETRY APPROACHES