Physicochemical parameters and arsenic speciation in the groundwater of the Bedrock aquifer of the Willamette Basin

These groundwater analyses were collected from the bedrock aquifer in the southern Willamette Basin near Creswell, OR, USA. Measurements include temperature, pH, specific conductance, dissolved oxygen, alkalinity, dissolved organic carbon, and arsenic speciation. Arsenic speciation includes arsenic as arsenite, arsenite, monomethylarsonate, dimethylarsinate, and total arsenic. These data were collected as part of an investigation to characterize the role of microorganisms and aquifer chemistry in arsenic speciation and cycling.