BS EN 15742:2020 pdf free.Animal feeding stuffs: Methods of sampling and analysis – Determination of OCPs by GC-ECD.
BS EN 15742 Mixed stock solution OCP (without endosulfan and toxaphene) Pipet of each OCP-stock solution (5.3) the indicated volume (Table 1) in a volumetric flask of 100 ml. Fill up to 100 ml with iso-octane (5.2.5) and mix. The achieved concentration is given in Table 1. Transport this solution to a brown medicine glass bottle of 100 ml and store it in a refrigerator at4 °C (+3 °C]. The solution is tenable under these conditions during at least 5 years if the weight is carefully controlled. Mixed stock solution endosulfan Pipet of each endosulfan-stock solution (5.3) the indicated volume (Table 1) in a volumetric flask of 100 ml. Fill up to 100 ml with iso-octane (5.2.5) and mix. The achieved concentration is given in Table 1. Transport this solution to a brown medicine glass bottle of 100 ml and store it in a refrigerator at 4。C (+3 °C]. The solution is tenable under these conditions during at least 5 years if the weight is
carefully controlled.Pipet 5,0 ml of the mixed stock solution OCPs (5.4.1) in a volumetric flask of 100 ml. Fill up to 100 ml with iso-octane (5.2.5) and mix. The achieved concentration is given in Table 1. Transport this solution to a brown medicine glass bottle of 100 ml and store it in a refrigerator at 4 °C (+3 °C]. The solution is tenable under these conditions during at least 5 years if the weight is carefully controlled. The calibration solutions can also be prepared on the basis of a certified mixed standard solution of for example 10 μg/ml. In that case, the solutions shall cover the concentration range as shown in Table 2.Prepare calibration mixtures according to Table 2 for OCPs, endosulfan and toxaphene each in a final volume of 5,0 ml ethyl acetate/cyclohexane (5.2.9). Store in a refrigerator at 4 °C (+3 °C]. The solution is tenable under these conditions during at least 1 year.Depending on the expected mass fractions in the samples, the highest levels [6 and 7) depicted in Table 2 may be ignored. However, the response in the sample extract should lie within the range of the calibration solutions.BS EN 15742 pdf downlaod.