Evaluating Hemp-Derived Biomass as a Reusable Sorbent for a Safe Aqueous Surrogate: A Bench-Scale Study

This preregistration documents a planned bench-scale study within the Circular Hemp Biorefinery Research Program. The study will evaluate whether documented hemp-derived biomass can reduce the measured intensity of a safe, food-grade, water-soluble color surrogate and whether measurable performance can be retained across repeated use cycles. The broader research program investigates the potential for cascading uses of hemp biomass, including sorption and filtration materials, environmental remediation applications, energy-storage materials, sensors, and other high-value sustainable materials. This initial study intentionally focuses on a narrow, low-hazard experimental question that can be evaluated under controlled bench-scale conditions. The study will use untreated, documented hemp biomass, a safe aqueous color surrogate, treatment replicates, and no-sorbent controls. Planned variables include biomass dose, contact time, documented particle-size class, and repeated-use cycles. Measurements will be standardized and raw observations, photographs, metadata, deviations, and analysis records will be preserved. The study does not claim to test or establish removal of PFAS, heavy metals, pesticides, pharmaceuticals, pathogens, or other hazardous contaminants. Results from the color surrogate will not be interpreted as proof of drinking-water treatment, field remediation, human-health benefit, or commercial viability. The purpose of preregistration is to establish a transparent, time-stamped record of the specific research question, hypotheses, experimental boundaries, planned measurements, and analysis framework before Run 1 data are collected.