Abstract

Paweena Porrawatkul, Rungnapa Pimsen, Arnannit Kuyyogsuy and Prawit Nuengmatcha

DOI : http://dx.doi.org/10.13005/ojc/340121

A simple and selectively visual detection of Cu²⁺ and Al³⁺ using Hibiscus rosa-sinensis Linn extract in aqueous solution was investigated for the first time. It was found that positive visual detections of Cu²⁺ and Al³⁺ gave their color change at pH 7. The selectivity of this method was examined using two masking agents, sodium fluoride (NaF) and dimethylglyoxime (DMG). The method exhibits good selectivity when NaF and DMG were used for the determination of Cu²⁺ and Al³⁺, respectively. The flower extract could be employed for Cu²⁺ and Al³⁺ detection at the lowest concentration of 0.5 mg/L and 1.0 mg/L, respectively. The results from naked-eye detection were also evaluated by comparing with those of using inductively coupled plasma - atomic emission spectrometry (ICP-AES), and there was no significant difference noticed. Moreover, the proposed method could be potentially applied for real water samples with visual detection of Cu²⁺ and Al³⁺, which was rapid, convenient, low-cost and environmental friendly.

Naked-Eye Detection; Aluminum; Copper; Hibiscus Rosa-Sinensis Linn

[ View HTML Full Text]