Abstract
A simple copper (II) ion (Cu2+) test kit was developed in this work using a cheap and environmental-friendly solid sorbent modified with cyanidin extracted from red cabbage. The best solid sorbent was found to be a cation-exchange resin (Pall Tech: PTNR 8715, Nuclear Grade ion Exchange Resin). The optimum ratio of cyanidin : resin was 1.6 mg : 2 g giving a clear naked-eye detection of interactive Cu2+. The detection of Cu2+could be able to change the color of modified resin at their different concentrations along with double rinsing the modified resin with a few solution of pH 7 buffer and mixing with 1 mL of water sample. To evaluation, the results from naked-eye detection were compared with those of Inductively Coupled Plasma Optical Emission Spectrophotometry (ICP-OES), and there was no significant difference noticed. The lowest detection limit of Cu2+ was 0.70 ppm which was lower than the drinking water contaminant standards. The modified resin might probably not able to change the color in case of high concentration of Calcium ion (Ca2+). However, this novel test kit could be applied in real water sample for preliminary screening and detecting the Cu2+ contamination with simplicity and also environmental-safety.
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