[Qualitative control in determining iron and copper in the blood serum]

The results from the intra-laboratory control of precision and accuracy of the determinations of Fe and Cu in blood serum by atom absortion spectrophotometry are reported. The determinations are made by atom absorption spectrophotometer Perkin Elmer Model 460. With Fe--reproducibility presented by the variation coefficient (VC) and tested in series is 2,45 p. c.; followed up periodically in time--it fluctuates from 4,40 to 2.07 per cent. The same data for Cu are; reproducibility in series 1,04 per cent, reproducibility in time from 8,25 to 2.10 per cent. With the optimization of the analytical conditions during the observation period, the dispersion of the results decreases and VC from the last several months approached 3 per cent, both for Fe and Cu. The data from the investigation on the accuracy of the normal and borderline region of Fe and Cu in serum are within the indicated limits for the control material (plus or minus 257). The attempt for detection of added quantities gave a detectability between 96,5 and 98,2 per cent for Fe and between 99,8 and 104,8 per cent for Cu.