OPTIMIZATION OF THE CONDITIONS FOR THE SPECTROPHOTOMETRIC DETERMINATION OF CHROMIUM(III) WITH THE AZO DERIVATIVE OF GOSSYPOL Ergashev Shohjahon Erkin ugli Gulistan State University, Faculty of Natural Sciences, Department of Chemistry (Analytical Chemistry), Gulistan, Uzbekistan
Year: 2026
Type: conference-paper
Abstract: The conditions for the spectrophotometric determination of Cr(III) were optimized using an analytical reagent based on local raw material (gossypol obtained from cotton seed) — the azo derivative of gossypol with 2-aminoethyl hydrogen sulfate (NY-I). Using a one-factor-at-a-time approach, the wavelength (492 nm), pH (7.1), buffer type, order of addition of the components, time and reagent volume (6 mL) were selected. The calibration dependence is linear in the range 1.2–3.6 µg/mL (A = 0.00113·m + 0.059; R2 = 0.995; n = 3), with an apparent ε = (1.5–4.0)·103 L·mol−1·cm−1. The method is not sensitive enough for monitoring chromium in drinking water, but it may be suitable for technological solutions with a high concentration.
Author: Shohjahon Ergashev
Institution: Gulistan State University
Language: English
Subfield: Analytical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7222794756