Yunes N, Moyano S, Cerutti S, Gásquez J A, Martinez L D
Department of Analytical Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, Chacabuco and Pedernera, San Luis, Argentina.
Talanta. 2003 Apr 10;59(5):943-9. doi: 10.1016/S0039-9140(02)00639-2.
An on-line nickel preconcentration and determination system implemented with inductively coupled plasma optical emission spectrometry (ICP-OES) associated to flow injection (FI) was studied. Trace amounts of nickel were preconcentrated by sorption on a conical minicolumn packed with activated carbon (AC) at pH 5.0. The nickel was removed from the minicolumn with 20% nitric acid. An enrichment factor of 80-fold for a sample volume of 50 ml was obtained. The detection limit (DL) value for the preconcentration method proposed was 82 ng l(-1). The precision for ten replicate determinations at the 0.5 microg l(-1) Ni level was 3.0% relative standard deviation (R.S.D.), calculated from the peak heights obtained. The calibration graph preconcentration method for nickel was linear with a correlation coefficient of 0.9997 at levels near the detection limits (DL) up to at least 100 microg l(-1). The method was successfully applied to the determination of nickel in natural water samples.
研究了一种与流动注射（FI）联用的电感耦合等离子体发射光谱法（ICP-OES）在线镍预富集和测定系统。痕量镍在pH 5.0条件下通过吸附在填充有活性炭（AC）的锥形微柱上进行预富集。用20%硝酸从微柱上洗脱镍。对于50 ml的样品体积，获得了80倍的富集因子。所提出的预富集方法的检测限（DL）值为82 ng l⁻¹。在0.5 μg l⁻¹镍水平下进行十次重复测定的精密度为相对标准偏差（R.S.D.）3.0%，由获得的峰高计算得出。镍的预富集校准曲线法在接近检测限（DL）的水平直至至少100 μg l⁻¹范围内呈线性，相关系数为0.9997。该方法成功应用于天然水样中镍的测定。
