Occurrence of arsenite in surface and groundwater associated with a perennial stream located in Western Nebraska, USA

Dissolved arsenic typically results from chemical weathering of rich sediments and is most often found in oxidized forms surface water. The mobility controlled by its valence state also association with iron oxides minerals, the which are both influenced abiotic biotic processes aqueous environment. In this study, speciation methods were used to measure confirm presence reduced species water Frenchman creek, a gaining stream that crosses Colorado-Nebraska border. Selective extraction analysis aquifer bed shows bulk occurs labile iron-rich oxy(hydroxide) minerals. Total dissolved groundwater ranged ~3–18 µg L?1, comprise about 41% total (16.0 L?1) creek. Leachable sediment samples up 1553 kg?1, while creek contained 4218 kg?1. Dynamic interaction sustains arsenite headwaters, implied toxicity hydrogeological setting, can be important environments around globe.