title: [Crosslinked carboxymethyl konjac glucomannan microcolumn preconcentration of trace lead, cadmium and copper in water samples and determination by graphite furnace atomic absorption spectrometry].
abstract: A novel solid phase extraction technique was developed for the determination of trace lead, cadmium and copper in environmental water samples based on separation and preconcentration with a microcolumn packed with crosslinked carboxymethyl konjac glucomannan (CCMKGM)prior to its determination by graphite furnace atomic absorption spectrometry. Various influential factors on the separation and preconcentration of lead, cadmium and copper, such as the acidity of the aqueous solution, sample flow rate and volume, and eluent concentration and volume, were investigated systematically, and the optimized operation conditions were established. The analytes could be quantitatively retained by CCMKGM in the pH range of 5.0-7.0, then eluted completely with 1.0 mL 0.5 mol x L(-1) HCl. The detection limits (3sigma) for analyte ions were 0.038 microg x L(-1) for Pb2+, 0.0005 microg x L(-1) for Cd2+ and 0.014 microg x L(-1) for Cu2+ with an enrichment factor of 50, and the relative standard deviations were 3.5% for Pb2+, 9.2% for Cd2+ and 4.7% for Cu2+ (c(Pb2+) = C(Cu2+) = 1.0 microg x L(-1); c(Cd2+) = 0.1 microg x L(-1), n=11). The proposed method was successfully applied to the determination of trace lead, cadmium and copper in environmental water samples (local tap water and lake water). In order to validate the method, the developed method was applied to the determination of lead, cadmium and copper in environmental water reference materials (ERMs, GSBZ 50009-88, PR China), and the results obtained were in good agreement with the certified values.
authors: College of Science, Huazhong Agricultural University, Wuhan 430070, China. hchenhao@mail.hzau.edu.cn
authors: Hao
authors: H
authors: Chen
authors: Min
authors: M
authors: Shen
authors: Ai-fang
authors: AF
authors: Xue
authors: Sheng-qing
authors: SQ
authors: Li
authors: Si-yi
authors: SY
authors: Pan
mesh_terms: D053000:Analytic Sample Preparation Methods / Q000379:methods*; D002104:Cadmium / Q000032:analysis / Q000302:isolation & purification; D003300:Copper / Q000032:analysis / Q000302:isolation & purification; D006108:Graphite; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000032:analysis / Q000302:isolation & purification; D057230:Limit of Detection; D008351:Mannans / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis* / Q000302:isolation & purification*; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods*; D013054:Spectrophotometry, Atomic; D014867:Water / Q000737:chemistry*
chemical_list: D008351:Mannans; D019216:Metals, Heavy; D002104:Cadmium; D014867:Water; D007854:Lead; C022901:(1-6)-alpha-glucomannan; D006108:Graphite; D003300:Copper