Modified FIA-CL system for the on-line analysis of Pb(II) in aqueous solution, following treatment with chemically modified tomato peel as a biosorbent

Abstract

Low waste generation represents a comprehensive orientation in analytical chemistry. It also forms a goal of flow injection analysis (FIA). The current research aims at modifying the injection part of the lucigenin-H2O2-OH- Pb(II) chemiluminescence detection system with flow injection analysis (FIA-CL) for an online Pb(II) analysis. The modified system was employed to determine the Pb(II)concentration. This was followed by treatment with crude tomato peels as an absorbent as tomato peels were treated with NaOH, carbonized tomato peels with HCl, and carbonized tomato peels with H2SO4. Under optimum experimental conditions, a calibration graph, represented by peak height (mV), was constructed based on plotting the chemiluminescence (CL) intensity, against (μg.ml−1) Pb(II) concentration, 10–90 μg.ml−1 range, 0.9913 correlation coefficient. Langmuir and Freundlich, used as isotherm models to verify the equilibrium results. The adsorption of Pb(II) on crude tomato peels and treated tomato peel was followed by the Langmuir model due to the high correlation coefficient (R2).