Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI

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The study presents the validation protocol for the determination of Cd, Cr, Cu, Pb and Zn by inductively coupled plasma atomic emission spectrometry in leachate of granular waste with size below 4 mm at liquid-to-solid ratio of 2 L/ kg and in aqua regia digest. The assay was found to be linear for a concentration range between limit of quantitation and 25 mg L^-1 (R=0.999). The limits of detection in leachate allow the determination of elements at concentration levels for the acceptance of non-hazardous wastes, while in aqua regia digest at values ten times lower than the normal levels in soil. Internal repeatability was in the range 0.8-5.4 %, reproducibility between 2.6 – 12 % and recovery 91-109 %, which fully complied with imposed targets in Romanian regulations. The maximum variance of the method was found for Zn (5.65 %), while the maximum relative expanded uncertainty for Cu (21 %).

Keywords: method validation, trace elements, atomic emission spectrometry, granular waste, leaching test