Özet:

This study includes an international qualification test (07217, Lab ID 53) on the three elements of arsenic, cadmium and bullet in pepper powder examples. The qualification test aims to ensure an independent assessment of the achievements of the participating laboratories. With the use of certified methods, the skill test is the fundamental element of laboratory quality assurance. A total of 55 laboratories participated in this skill test. The reference values assigned to the analytics for performance assessment are provided by the organizers. Z-skor was used as a numerical indicator to interpret the competence of the participants. Where possible, the correlations between performance and method selection were provided with a general view of the analytical methods used by PT participants. Certified reference material (NIST Tomato Sheet 1573a and ERM-BC084 Tomato Spray) was dissolved with nitric acid and hydrogen peroxide in a microwave. Calibration was carried out by the addition of standards prepared in concentrations of 0.5, 1, 2, 5, 10, 25 and 50 μgL-1 from the matrix 10 mgL-1 stock standard solution. According to the results, the z score for As, Cd and Pb was 0.9, 0.3 and 1.1 respectively.

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