Abstract：A novel catalytic kinetic spectrophotometric determination of trace lead was established based on Pb(Ⅱ) had catalytic effect on the fading reaction of nuclear fast red oxidized by potassium iodate in perchloric acid-potassium biphthalate medium at 90℃ water bath. The optical experimental conditions, which were obtained by orthogonal experiments and variance analysis, were as follows: 8.0 mL of 1 g/L nuclear fast red solution, 2.5 mL of 0.02 mol/L perchloric acid, 0.5 mL of 0.02 mol/L potassium acid phthalate solution and 1.5 mL of 0.02 mol/L potassium iodate solution. The linear range of this method was 4.0×10-5-4.4×10-3 g/L and detection limit was 3.0×10-6 g/L. It was found that the catalytic reaction was pseudo-first-order reaction with apparent activation energy of 29.762 kJ/mol and apparent rate constant of 1.2 ×10-4 s-1.When the proposed method was applied to the determination of lead in local zinc mine tailings, the results were consistent with those obtained by atomic absorption spectrometry. The relative standard deviation (n=9) was 1.5 % -2.1 %, and the recoveries were between 98 %-104 %.
毛红,赵连佳. 石墨炉原子吸收法测定次氯酸钠消毒剂中铅的方法研究[J]. 中国卫生检验杂志(Chinese Journal of Health Laboratory Technology ),2006,16(5):561-562.
[2]
周庆祥,白画画,代文华,等. 浊点革取火焰原子吸收光谱法测定环境水样中痕量铅[J]. 河南师范大学学报:自然科学版 (Journal of Henan Normal University:Natural Science),2007,35(2): 115-118.
[3]
Lima E C, Brasil J L, Santos A H D P. Evaluation of Rh,Ir,Ru,W-Rh,W-Ir and W-Ru as permanent modifiers for the determination of lead in ashes,coals,sediments,sludges,soils,and freshwaters by electrothermal atomic absorption spectrometry[J]. Anal. Chim. Acta .,2003,484(2): 233-242.
[4]
刘丽萍,毛红,张妮娜,等.电感耦合等离子体质谱法测定运动员食品中铅砷钢铜[J]. 质谱学报(Journal of Chinese Mass Spectrometry Society), 2006, 27(2):90-93.
[5]
Chen S, Zhang Z, Yu H, et al. Determination of trace lead by hydride generation-inductively coupled plasma-mass spectrometry[J]. Anal. Chim. Acta., 2002, 463(2): 177-188.
