Use of silica gel chemically modified with zirconium phosphate for preconcentration and determination of lead and copper by flame atomic absorption spectrometry

被引:126
作者
Matoso, E [1 ]
Kubota, LT [1 ]
Cadore, S [1 ]
机构
[1] Univ Estadual Campinas, Inst Quim, Dept Quim Analit, BR-13084971 Campinas, SP, Brazil
关键词
lead; copper; preconcentration; atomic absorption spectrometry;
D O I
10.1016/S0039-9140(03)00215-7
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
An analytical method using silica gel chemically modified with zirconium (IV) phosphate for preconcentration of lead and copper. in a column system, and their sequential determination by flame atomic absorption spectrometry (FAAS), was developed. Sample solutions are passed through a glass column packed with 100 mg of the sorbent material, at pH 4.5, and lead and copper are eluted with 1.0 mol l(-1) HNO3 at a flow rate of 2.0 ml min(-1). The extraction of copper is affected by Fe(II), Mn(II), Zn(II), Ni(II) and Co(II) while only Fe(II) interferes in the lead determination. These interferences may be overcome with an appropriate addition of a KI or NaF solution. An enrichment factor of 30 was obtained for both metals. While the limits of detection (3sigma) were 6.1 and 1.1 mug l(-1), for Pb and Cu, respectively, the limits of determination were 16.7 and 3.3 mug l(-1). The precision expressed as relative standard deviation (R.S.D.) obtained for 3.3 mug l(-1) of Cu and 16.7 mug l(-1) of Pb were 4.3 and 4.7% respectively, calculated from ten measurements. The proposed method was evaluated with reference material and was applied for the determination of lead and copper in industrial and river waters. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:1105 / 1111
页数:7
相关论文
共 22 条
  • [11] ADSORPTION OF CHROMIUM(VI) BY TITANIUM(IV) OXIDE COATED ON A SILICA-GEL SURFACE
    KUBOTA, LT
    GUSHIKEM, Y
    MOREIRA, JC
    [J]. ANALYST, 1991, 116 (03) : 281 - 283
  • [12] Sorption and preconcentration of metal ions on silica gel modified with 2,5-dimercapto-1,3,4-thiadiazole
    Lessi, P
    Dias, NL
    Moreira, JC
    Campos, JTS
    [J]. ANALYTICA CHIMICA ACTA, 1996, 327 (02) : 183 - 190
  • [13] LEYDEN DE, 1981, ANAL CHEM, V53, P1059, DOI 10.1021/ac00232a731
  • [14] LopezArtiguez M, 1996, ATOM SPECTROSC, V17, P83
  • [15] BIOAVAILABILITY OF TRACE-METALS TO AQUATIC ORGANISMS - A REVIEW
    LUOMA, SN
    [J]. SCIENCE OF THE TOTAL ENVIRONMENT, 1983, 28 (JUN) : 1 - 22
  • [16] MOHAMMAD AT, 1997, TALANTA, V45, P411
  • [17] New sorbents and indicator powders for preconcentration and determination of trace metals in liquid samples
    Morosanova, E
    Velikorodny, A
    Zolotov, Y
    [J]. FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY, 1998, 361 (03): : 305 - 308
  • [18] Adsorption parameters of Cd(II), Pb(II), and Hg(II) on zirconium(IV) phosphate chemically grafted onto silica gel surface
    Nagata, N
    Kubota, LT
    Bueno, MIMS
    Peralta-Zamora, PG
    [J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1998, 200 (01) : 121 - 125
  • [19] PARMEGGIANI L, 1983, ENCYC OCCUPATIONAL H, V1
  • [20] PRECONCENTRATION AND INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETRIC DETERMINATION OF METAL-IONS WITH ONLINE CHELATING ION-EXCHANGE
    PORTA, V
    SARZANINI, C
    ABOLLINO, O
    MENTASTI, E
    CARLINI, E
    [J]. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, 1992, 7 (01) : 19 - 22