Highly Sensitive Colorimetric Detection of Cd(ii) Based on Silica Sol Modified with Dithizone and Cationic Surfactant

Overview

Journal RSC Adv

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2024 Oct 11

PMID 39391625

Authors

Arpaporn Litluechai

Arreerat Prompa

Pikaned Uppachai

Wirat Jarernboon

Nutthaya Butwong

Siriboon Mukdasai

Affiliations

Soon will be listed here.

Abstract

The cadmium ion (Cd) is highly poisonous and nondegradable and easily bioaccumulates through the food chain. Therefore, it is crucial to develop cost-effective chemical sensors for Cd with fast response time, high selectivity, and very low detection limits. In this study, a colorimetric sensor for the determination of Cd was fabricated by modifying silica sol with dodecyltrimethylammonium bromide (DTAB) and dithizone (DZ). Cd formed a complex with DZ, changing the solution color immediately from purple to orange prior to detection using ultraviolet-visible spectrophotometry and a customized Cd analyzer for the precipitate. Under the optimum conditions, the developed Cd sensor had a linear range of 0.01-0.25 mg L, a low limit of detection of 5.0 μg L, and outstanding repeatability. This sensor also showed good precision, with the relative standard deviations of less than 2.59% and 3.24% for the intra- and inter-day data, respectively. The proposed colorimetric method was successfully applied to determine Cd in environmental water samples, and the results were comparable to those obtained using standard atomic absorption spectrometry. Moreover, quantitative analysis was conducted using the customized Cd analyzer to estimate the color intensity change, without requiring sophisticated scientific instruments. This colorimetric sensor can be used for the portable, cost-effective, and rapid on-site detection of Cd in environmental water samples.

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