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Bertoldi et al. (2018) performed an experiment to determine geographical traceability of Italian goji berries through evaluating the characteristics of the berries. Unlike the experiments by Bellaio, Carnevale and Bona (2014) and Niro et al. (2017) that used samples exclusively from Italian-cultivated goji berries, the experiment by Bertoldi et al. (2018) incorporated goji berries from Italy (Calabria, Lazio, Puglia, Umbria, and Veneto), China (Ningxia, Qinghai, Inner Mongolia, Xinjiang, Hebei, and Yunnan), and Tibet. The process of determination and analysis of inorganic elements was done on 500mg samples of dry Lycium barbarum from each of the regions. 500mg of each sample was first weighed in a quartz tube then mixed with 4ml of ultrapure nitric acid in order to facilitate digestion. Consequently, the solution was cooled and placed in a 13ml polypropylene tube before adding ultrapure water to increase the volume of the contents to 13 ml. The batches placed in the microwave contained similar contents made up of blank sample and a certified material of reference. Therefore, the methodology used by Bertodi et al. (2018) is different from the simple procedures applied in this project.