In-situ analysis and monitoring of antiscalant polyaspartate by mobile fluorescence spectroscopy

Monitoring and controlling antiscalants, such as polyaspartate (PASP), in technical systems is essential to prevent scale formation and optimize inhibitor application. We developed a Fluorescence-based In-situ Polyaspartate Analysis (FIPSA) using a portable fluorometer equipped with optical fiber sensors for real-time PASP detection in various environmental and industrial settings. We quantified the impact of solution matrix effects, including pH, temperature, ionic strength, and turbidity, on fluorescence signals, emphasizing the need for on-site calibration. The FIPSA method enhances process efficiency by simplifying data acquisition for the planning and implementation of hardness stabilization systems and enabling dynamic PASP dosing adjustments for optimized inhibitor application during system operation (e.g. tunnel drainage, wells, pipelines, industry). The FIPSA method•enables real-time PASP concentration measurement with a detection limit of ≈1 mg/L•is adaptable to different PASP formulations and water matrices•reduces dependence on time-delayed laboratory analyses.