Preparation of Calibration Curves for the Direct Determination of Trace Level of Zinc in High Purity Iron and Steel Samples by Graphite Furnace Atomic Absorption Spectrometry Using Solid Sampling Technique

The preparation of calibration curves using an aqueous standard solution was studied for the direct determination of trace levels of zinc in high-purity iron and steels by graphite furnace atomic absorption spectrometry (GF-AAS) using solid sampling technique. Certified reference materials of high-purity iron and steel samples were used to confirm the trueness of the proposed methods. The standard addition method for the solid sampling technique that we have proposed gave accurate analytical results. The calibration curve prepared by the standard addition method can be used as a kind of iron-matrix matching calibration curve, and it provides rapid and accurate determinations of zinc. The detection limit of zinc in iron and steel samples was 0.86 mg kg(-1) when 15 mg of one sample was measured.