In this section we examine anthropogenically perturbed, complex natural systems and assess the importance of mineral-surface interactions with pollutant ions. We have chosen several examples including our own collaborative studies of Pb-polluted sites in Colorado (USA) and France, our collaborative study of several As-polluted sites in France, and a major ongoing study of arsenic pollution in southern Asia from the work of our Stanford colleague Scott Fendorf and his group. These studies have shown the importance of mineral-surface reactions in natural systems in controlling the bioavailability of two of the most important environmental pollutants – lead and arsenic. Lead is...

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