The preparation of a certified reference material of polar pesticides in freeze-dried water (CRM 606) |
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Authors: | A Martín-Esteban P Fernández C Cámara G N Kramer E A Maier |
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Institution: | Departamento de Química Analítica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain, ES Institute for Reference Materials and Measurements, Retieseweg, B-2440 Geel, Belgium, BE Measurement and Testing Programme, European Commission, 200 Rue de la Loi, B-1049 Brussels, Belgium, BE
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Abstract: | The preparation of a certified reference material of polar pesticides in freeze-dried water is described. The pesticides selected were atrazine, simazine, carbaryl, propanil, linuron, fenamiphos and permethrin which were added to 6000 litres of tap water at 50–80 μg · L–1 (200–320 μg · L–1 for permethrin) level in presence of NaCl (2.5 g · L–1) prior lyophilization. After the freeze-drying process the residue was rehomogenized, filled into amber glass bottles and stored at –20?°C, +4?°C and +20?°C. All pesticides were determined by HPLC/diode array detector, except permethrin which was determined by GC/ECD. The results obtained for atrazine, simazine, carbaryl, propanil, linuron and fenamiphos showed no within- or between-bottle inhomogeneity, however the material was non-homogeneous for permethrin and therefore this was withdrawn from further studies. With respect to the stability for over one year, all pesticides were stable at –20?°C. At +4?°C all pesticides were stable for at least 9 months and at +20?°C the stability was demonstrated only during the first month of storage. The content (mass fractions) of atrazine, simazine, carbaryl, propanil and linuron in freeze-dried water (CRM 606) was certified by an interlaboratory testing and a certification campaign. |
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