title: Effectively simultaneous naked-eye detection of Cu(II), Pb(II), Al(III) and Fe(III) using cyanidin extracted from red cabbage as chelating agent.
abstract: Simultaneous determination of Cu(II), Pb(II), Al(III) and Fe(III) using cyanidin as a chelating agent was investigated in terms of both quantitative and qualitative detections. Cyanidin was extracted and purified from red cabbage which is a local plant in Thailand. The selectivity of this method was examined by regulating the pH of cyanidin solution operated together with masking agents. It was found that Cu(II), Pb(II), Al(III) and Fe(III) simultaneously responded with the color change at pH 7, pH 6, pH 5 and pH 4, respectively. KF, DMG and the mixture of KF and DMG were used as masking agents for the determination of Fe(III), Al(III) and Pb(II), respectively. Results from naked-eye detection were evaluated by comparing with those of inductively coupled plasma (ICP), and there was no significant difference noticed. Cyanidin using as a multianalyte reagent could be employed for simultaneous determination of Cu(II), Pb(II), Al(III) and Fe(III) at the lowest concentration at 50, 80, 50 and 200μM, respectively, by slightly varying pHs. Moreover, the proposed method could be potentially applied for real water samples with simplicity, rapidity, low cost and environmental safety.
authors.affiliation: Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
authors.forename: Warangkhana
authors.initials: W
authors.lastname: Khaodee
authors.affiliation: Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. Electronic address: wanlapa.a@chula.ac.th.
authors.forename: Wanlapa
authors.initials: W
authors.lastname: Aeungmaitrepirom
authors.affiliation: Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
authors.forename: Thawatchai
authors.initials: T
authors.lastname: Tuntulani
mesh_terms: D000535:Aluminum / Q000032:analysis*; D000872:Anthocyanins / Q000737:chemistry* / Q000302:isolation & purification; D001937:Brassica / Q000737:chemistry; D002614:Chelating Agents / Q000737:chemistry* / Q000302:isolation & purification; D003124:Colorimetry / Q000379:methods; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D003300:Copper / Q000032:analysis*; D005290:Ferric Compounds / Q000032:analysis; D007501:Iron / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D057230:Limit of Detection; D013053:Spectrophotometry / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000872:Anthocyanins; D002614:Chelating Agents; D004396:Coloring Agents; D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; D007854:Lead; C017154:cyanidin; D003300:Copper; D000535:Aluminum; D007501:Iron
keywords: Cyanidin; Metal detection; Naked-eye; Red cabbage; Water analysis