New calibration method for solid sampling Zeeman atomic absorption spectrometry (SS-ZAAS) for cadmium

Summary Calibration of solid sampling Zeeman AAS for cadmium was investigated. A series of certified reference materials was analysed using a CRM with a different composition as standard. For routine applications this yielded satisfactory results. A method of calibration was then applied involving addition of standard solution to lyophilized samples, followed by lyophilization and homogenization. Using an iteration procedure results were obtained which no longer depend on certified reference materials. The method was applied to the analysis of a testbatch of codfish powder prepared at CBNM. Finally, the spiked fish standards obtained in this way were also used to analyse other certified reference materials.