Trace metal determinations in local grapes growing in Denizli region

In this study, Cr, Pb, Cu, Ni, Fe and Mn concentrations were determined by flame atomic absorption spectrometry (AAS) in the soil samples of grapes, raisins and soil samples where grapes are grown collected from four districts of Denizli, Bekilli, Honaz, Çal and Buldan. Before analysis, samples were solubilized by two different methods, wet incineration and microwave incineration. In the results obtained by both solubilization methods, it was observed that the heavy metal amounts were the highest in the soil sample and the least in the fresh grape sample. In general, heavy metal levels were found to be higher in samples that were solubilized by microwave oven method. The results were compared with the limit values in the literature. The results obtained with these two solubilization methods were compared as %RSD relative standard deviation, % relative error, and the results were found below 5%. Limit of detection values (LOD) 0.2451 µg/mL for Cr, 0.1363 µg/mL for Pb, 0.1254 µg/mL for Ni, 0.1382 µg/mL for Cu, 0.0682 µg/mL for Mn, as 0.3718 µg/mL for Fe; Limit of determination values (LOQ) are 0.4607 µg/mL for Cr, 0.4565 µg/mL for Pb, 0.2543 µg/mL for Ni, 0.3827 µg/mL for Cu, 0.1658 µg/ for Mn mL was calculated as 0.8635 µg/mL for Fe.