Determination of lead and cadmium in rice samples by sequential injection/anodic stripping voltammetry using a bismuth film/crown ether/Nafion modified screen-printed carbon electrode

被引：104

作者：

Keawkim, Kannika ^{[1
]}

Chuanuwatanakul, Suchada ^{[1
,2
]}

Chailapakul, Orawon ^{[1
,2
]}

Motomizu, Shoji ^{[3
]}

机构：

[1] Chulalongkorn Univ, Electrochem & Opt Spect Res Unit, Dept Chem, Fac Sci, Bangkok 10330, Thailand

[2] Chulalongkorn Univ, Ctr Excellence Petr Petrochem & Adv Mat, Bangkok 10330, Thailand

[3] Okayama Univ, Fac Sci, Dept Chem, Okayama 7008530, Japan

来源：

FOOD CONTROL | 2013年 / 31卷 / 01期

关键词：

Lead and cadmium; Rice; Sequential injection analysis; Anodic stripping voltammetry; Modified screen-printed carbon electrode; Automated method; ABSORPTION SPECTROMETRIC DETERMINATION; TRACE HEAVY-METALS; FILM ELECTRODES; FLOW-INJECTION; WATER SAMPLES; COLUMN; COPPER; ZN; PB; PRECONCENTRATION;

D O I：

10.1016/j.foodcont.2012.09.025

中图分类号：

TS2 [食品工业];

学科分类号：

0832 ;

摘要：

A highly sensitive automated method for the determination of Pb2+ and Cd2+ by sequential injection/anodic stripping voltammetry using a crown ether/Nafion modified screen-printed carbon electrode coated with a bismuth film was developed. The bismuth film was prepared by in situ depositing of Bi3+ simultaneously with the analyte metal ions on the modified electrode at -1.2 V vs. Ag/AgCl reference electrode for 180 s, using hydrochloric acid as a supporting electrolyte. Under the optimal conditions, estimated from sequential univariate analysis of each of the parameters, a linear detection range of 0.5-60 mu g dm(-3) for both metal ions was found, with a LOD (3S(b)/S) of 0.11 mu g dm(-3) for Pb2+ and 0.27 mu g dm(-3) for Cd2+. This method shows good reproducibility and stability and was successfully applied to measure Pb2+ and Cd2+ levels in rice and rice product samples, with good agreement with those obtained by the standard ICP-OES method. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：14 / 21

页数：8

共 33 条

[1] A study on the utility of bismuth-film electrodes for the determination of In(III) in the presence of Pb(II) and Cd(II) by square wave anodic stripping voltammetry [J].