Determination of chromium by magnetic aloe vera biocomposite

In this thesis, for the determination of chromium(III) method components by magnetic solid phase extraction (Aloe vera-nZVI-MSPE) using Aloe vera modified Fe3O4 nano biocomposite and its determination by atomic absorption spectrometry predictions. Structural characterization of aloe vera-nZVI nano biocomposite was investigated by Fourier Transform Infrared Spectroscopy (ATR-IR), Energy Dispersive X-ray spectroscopy (EDS), and Scanning Electron Microscopy (SEM). Chromium(III) ion retention was obtained with 50 mg Aloe vera-nZVI from 200 mL sample at pH 7 with ≥% 95 quantitative recovery with 1 mL of 1 mol/L HNO3 eluent. The extraction time was set as 10 min. The enrichment factor was calculated as 200 with a sample volume of 200 mL and an eluent volume of 1 mL. Under optimum conditions, the detection limit was 3.4 µg/L, the detection limit was 8.9 µg/L, and the relative error of the method was %5. It has been verified by analysis of certified reference water samples and standard addition experiments, and the accuracy of the method has been tested. The method has been successfully applied to the determination of chromium (III) in various water samples.