Colorimetric and fluorescent sensing of rhodamine using polymethacrylate matrix

This is a description of the tracer analysis method involving colorimetric and fluorescent measurements based on solid phase extraction of rhodamine into transparent polymethacrylate matrix. Concentration of rhodamine in PMM is measured as spectrophotometric absorption level at 535 nm and fluorescence at 554 nm. The calibration graphs are linear within the ranges 0.02-0.10 mg∙L^-1 and 0.002-0.06 mg∙L^-1 and detection limits 0.014 mg∙L^-1 and 0.0005 mg∙L^-1 are calculated for colorimetric and fluorescent measurements, respectively. The method has been successfully used for determination of rhodamine in groundwater.