Proficiency test for dioxins and dioxin-like PCBs in fats

The test provides an evaluation of the methods applied for quantification of dioxins and dioxin-like PCBs in fat by the laboratories. The proficiency test was organised according to ISO 17043. For this test, four samples were prepared: - sunflower oil spiked with dioxins and PCBs; - sunflower oil mixed with contaminated fish oil; - sunflower oil mixed with contaminated chicken fat and spiked with 2,3,7,8-PCDF; - sunflower oil mixed with contaminated chicken fat and spiked with non-dioxin like PCBs.