Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago-33, Chile.
Talanta. 2011 Oct 15;85(5):2316-9. doi: 10.1016/j.talanta.2011.07.062. Epub 2011 Jul 23.
A sensitive procedure is presented for the voltammetric determination of nickel. The procedure involves an adsorptive accumulation of nickel 1-nitroso-2-napthol (NN) complex on a bismuth film electrode prepared ex situ by electrodeposition. The most suitable operating conditions and parameters such as pH, ligand concentration (C(NN)), adsorptive potential (E(ads)), adsorptive time (t(ads)), scan rate and others were selected and the determination of nickel in aqueous solutions using the standard addition method was possible. The adsorbed Ni-NN complex gives a well defined cathodic stripping peak current at -0.70 V, which was used for the determination of nickel in the concentration range of 10.0-70.0 μg L(-1) (pH 7.5; C(NN) 6.5 μmol L(-1); E(ads) -0.30 V; t(ads) 60s) with a detection limit of 0.1 μg L(-1). The relative standard deviation for a solution containing 10.0 μg L(-1) of Ni(II) was 3.5% (n=4). The proposed method was validated determining Ni(II) in certified reference waste water (SPS-WW1) and Certified Reference Water for Trace Elements (TMDA 51.3) with satisfactory results. Then lake water samples were analyzed.
一种灵敏的程序被提出用于测定镍的伏安法。该程序涉及镍 1-亚硝基-2-萘酚（NN）络合物在由电化学沉积原位制备的铋膜电极上的吸附累积。选择了最合适的操作条件和参数，如 pH 值、配体浓度（C（NN））、吸附电位（E（ads））、吸附时间（t（ads））、扫描速率等，并使用标准加入法可以在水溶液中测定镍。吸附的 Ni-NN 络合物在 -0.70 V 处给出了一个定义明确的阴极剥离峰电流，可用于在 10.0-70.0 μg L（-1）（pH 7.5；C（NN）6.5 μmol L（-1）；E（ads）-0.30 V；t（ads）60s）的浓度范围内测定镍，检测限为 0.1 μg L（-1）。含有 10.0 μg L（-1）Ni（II）的溶液的相对标准偏差为 3.5%（n=4）。该方法通过测定认证参考废水（SPS-WW1）和痕量元素认证参考水（TMDA 51.3）中的 Ni（II）得到了验证，结果令人满意。然后分析了湖水样品。
