A Simple Colorimetric Procedure using a Smartphone Camera for Determination of Copper in Copper Supported Silica Catalysts

Abstract

© 2020, Pleiades Publishing, Ltd. Abstract: A simple and low cost colorimetric procedure using an Android smartphone was developed for determination of copper(II) in copper supported silica catalysts. The developed software was installed in a smartphone for measuring the intensity of the blue color produced by the reaction between copper(II) and 2-carboxy-2'-hydroxy-5'-sulfoformazyl-benzene in an acidic solution. More than one sample can be measured by taking only one photo shot. Under the selected conditions, the linear range from 0 to 5 mg/L was obtained with the detection and quantitation limits of 0.04 and 0.13 mg/L, respectively. The method provided a good precision with the percent relative standard deviation values less than 5%. The percent recoveries were in the range of 97–104%. The results corresponded well with those obtained by atomic absorption spectrophotometry. This developed method is convenient, rapid and simple with an uncomplicated device.