Heavy metal contents, mobility and origin in agricultural topsoils of the Galápagos Islands

A study of agricultural topsoils from the Galápagos Islands reveals high levels of cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), nickel (Ni), and zinc (Zn) compared to global standards, with potential ecological and health risks. Lead (Pb) levels were low, while uranium (U) concentrations were similar to other regions. The research found that Ni, Co, Cr, Pb, and U tend to accumulate with increased weathering duration, suggesting natural sources. Conversely, Cd mobility rises with soil age, indicating possible agrochemical influence, particularly on Santa Cruz Island. The study highlights the need for systematic soil analysis in pristine areas to establish background levels and develop quality standards, ensuring crop safety and environmental health on this unique island chain.

Dinter, T. C., Gerzabek, M. H., Puschenreiter, M., Strobel, B. W., Couenberg, P. M., & Zehetner, F. (2021). Heavy metal contents, mobility and origin in agricultural topsoils of the Galápagos Islands. Chemosphere, 272, 129821. https://doi.org/10.1016/j.chemosphere.2021.129821