Abstract
High concentrations of Arsenic (As) were found in the waters of the alkaline lakes of the São Roque farm (Pantanal of Nhecolandia) collected during the dry season in October 2017 and September 2018. However, the concentrations of this element in the samples collected in 2017 were 9 to 49 higher than in the samples collected in 2018. These differences were attributed to the variation of th…