“…Turbidity can be caused by clay, silt, nonliving organic particulates, plankton, microbes, or suspended organic or inorganic matter. Turbidity caused by suspended inorganic matter is particularly common in groundwater, and precipitated iron oxides/hydroxides are one source (as was visibly observed at well 1) ( 43 , 79 , 80 ). Turbidity is known to influence absorbance throughout the UV spectrum ( 81 , 82 ), and high positive correlation coefficients have previously been reported between turbidity and UV 254 absorbance ( 83 ).…”