Absorbance-Based Evaluation of Black Grass Jelly and Chitosan Adsorption on Sand Under Different Formation-Water Salinities
DOI:
https://doi.org/10.29303/goescienceed.v7i4.3524Keywords:
Absorbance, Enhanced Oil Recovery, Spektrophotometry, Mesona Palustris, Polymer.Abstract
Absorbance spectroscopy was used to estimate polymer concentrations and evaluate polymer adsorption onto sand. This study investigated black grass jelly, chitosan, polyacrylamide, black grass jelly–chitosan, and black grass jelly–polyacrylamide formulations in synthetic formation water with NaCl salinities of 10,000, 15,000, and 20,000 mg/L. Polymer concentrations of 500, 1,000, and 2,000 mg/L were tested using 50-mesh (0.355 mm) and 100-mesh (0.149 mm) sand. Calibration curves were developed for each formulation and salinity, and adsorption was estimated from the remaining polymer concentration after contact with sand. For black grass jelly at 10,000 mg/L salinity, absorbance increased from 0.066 to 0.091 as concentration increased from 500 to 2,000 mg/L. Maximum adsorption values ranged from 1.296 to 1.934 mg/g for 100-mesh sand and from 1.654 to 1.934 mg/g for 50-mesh sand. Chitosan exhibited the highest reported adsorption, reaching 1.934 mg/g on 50-mesh sand and 1.869 mg/g on 100-mesh sand at 10,000 mg/L salinity. Overall, adsorption generally increased with initial polymer concentration. These findings demonstrate the potential of absorbance-based calibration for evaluating polymer retention, although calibration quality and low absorbance values should be considered when interpreting the results.
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