RESUMEN
A 1-year monitoring study is presented on the chemical status of two surface water reservoirs in a decentralized Mediterranean island. Water samples were collected at varying depths in the two surface water reservoirs and different seasons between November 2015 and September 2016, covering both wet and dry periods of the year. Samples were analyzed in order to determine major chemical parameters and priority substances based on the EU Water Framework Directive (2000/60/EC) and the latest revision of the Priority Substances Policy Directive (2013/39/EU). Tested parameters in both reservoirs did not exceed the set limits. Increased pollutant concentrations were observed in the bottom samples. More than 200 pesticide active substances were determined but none of them was above the parametric trigger value (0.1 µg L-1). Toxic metals were not detected in the examined water samples, whereas the relatively high concentrations of Mn and Cu in the bottom samples are mainly attributed to geogenic background concentrations. Based on the results of the present study, it can be concluded that the chemical situation of both water reservoirs is considered acceptable; however, continuous monitoring should be implemented in the area.
Asunto(s)
Agua Dulce/análisis , Islas , Estaciones del Año , Contaminantes Químicos del Agua/análisis , Calidad del Agua , Abastecimiento de Agua/normas , Agua/química , Monitoreo del Ambiente , Islas del Mediterráneo , Metales Pesados/análisis , Plaguicidas/análisis , Contaminación Química del Agua/análisisRESUMEN
A simple, fast and precise High Performance Liquid Chromatographic method with diode array detector was developed and single laboratory validated for the determination of mepiquat chloride in soluble concentrate pesticide formulations. From the results obtained, the repeatability of the method expressed as relative standard deviation (%RSD) was found to be 0.3%, and the limit of detection was 0.02 microg/mL. The accuracy of the whole procedure estimated by the comparison of the results obtained with the reference values, and was found to be acceptable as t(cal) < t(crit). The precision of the method also considered acceptable as the experimental repeatability relative standard deviation (RSD(r)) was lower than the interlaboratory relative standard deviation (RSD(R)), calculated by the Horwitz equation.
Asunto(s)
Cromatografía Líquida de Alta Presión/métodos , Plaguicidas/química , Piperidinas/análisis , Reproducibilidad de los Resultados , Espectrofotometría UltravioletaRESUMEN
Eight different hot springs (SPA) in Greece were monitored over a one-year survey for priority pesticide residues. A specific and effective procedure including solid phase extraction in combination with HPLC and GC analytical methods were applied. Samples that were sensitive to nitrogen-phosphorus (NPD) and/or electron capture (ECD) detectors were analysed by capillary gas chromatography. From the twenty-six water samples, pesticide residues were detected in fourteen of them (54%) but no one exceeding the European Union Maximum Acceptable Concentration (MAC). Lindane (gamma-BHC) was the most frequently detected pesticide. It was found in nine samples (35%) in concentrations from < 0.005 to 0.01 microg/L. Other pesticides detected were phorate (in five samples), propachlor (in two samples) and chlorpyriphos ethyl (in three samples) but in concentrations far below the permissible levels.