Spectrophotometric and Selective Copper(II) Detection by Valine as an Optical Chemical Sensor

Abstract

Optical sensors have attracted significant scholarly attention for the detection of various metal ions, attributable to their superior selectivity, sensitivity, and rapid response capabilities. Among metal ions, copper(II) has emerged as a focal point of research due to its toxicological implications and prevalent utilization across diverse industrial applications. Recently, a multitude of optical chemical sensors exhibiting remarkable sensitivity and selectivity for copper(II) detection have been developed. This investigation employs a valine (Val) optical chemical sensor to quantify trace amounts of copper(II) via spectrophotometric techniques. Valine has demonstrated considerable efficacy as an optical chemical sensor for the detection of copper(II) ions in various aqueous matrices. resulting in a distinctly characterized Cu(II) complex exhibiting absorption maxima at 617 nm. Optical sensing demonstrated exceptional linearity between absorbance and Ni(II) concentration, with correlation coefficients (R²) of 0.989 and limits of detection (LOD) quantified at 1×10⁻³. (Val) has emerged as a highly effective reagent for the detection of Cu(II) ions across a variety of aqueous matrices, functioning proficiently as an optical chemical sensor.