A group of experts from the University of Seville has carried out a comparative study of the concentrations—both totals as well as fractions—of the metals found in sediment in the River Guadiamar in 2002 with those present in the same area in 2018. After this study, the researchers state that there has been an important fall in the total concentrations, and evolution of the metal fraction towards their more innocuous forms, so the environmental risk is much reduced.
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Source: Phys.org