Abstract

PEREZ LOPEZ, Esteban  and  RODRIGUEZ RODRIGUEZ, Rosa Angélica. Comparison between two chromatographic methods to determine chlorothalonil in a commercial fungicide. Cuadernos de Investigación UNED [online]. 2019, vol.11, n.3, pp.334-344. ISSN 1659-4266.  http://dx.doi.org/10.22458/urj.v11i3.2627.

“Comparison between two chromatographic methods to determine chlorothalonil in a commercial fungicide”. Introduction: Chlorothalonil can be determined by several analytical techniques, including gas chromatography (GC) and high performance liquid chromatography (HPLC). These two techniques are used often because they have a higher level of stability and sensitivity. Objective: To compare the efficacy of analytical methodologies by GC and by HPLC for the determination of chlorothalonil in a commercial fungicide. Methods: Both the HPLC method and the GC method used by the laboratory were applied to equivalent samples and the results were compared with paired statistical tests. Results: Both methods produced statistically equivalent and reliable results. These parameters were satisfactory: selectivity, range of work and linearity, limit of detection and quantification, repeatability, intermediate precision, robustness, veracity and bias; we consider them linear, precise and exact methods that meet the norms of the Costa Rican Accreditation Entity (ECA). Conclusions: Both methods for determining chlorothalonil can be used reliably under the defined conditions.

Keywords : Agrochemicals; chlorothalonil; pesticides; analytical method; validation.

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