CAJ | 학술논문

本文提出了纳米 Ti02分离富集火焰原子吸收光谱法测定水样中痕量铅的新方法。考察了铅在纳米 Ti02上的吸附动力学、最佳酸度和吸附容量。实验结果表明：在最佳实验条件下，纳米 Ti02能定量、快速地吸附水中含有的痕量 Pb2+，其静态吸附容量为17.9 mg/g。吸附在纳米 Ti02上的 Pb2+可用0.1 mol/L HNO3+0.1 mol/LCH3COOH 完全洗脱。本法对 Pb2+的检出限为2.57 ng/mL,相对标准偏差为2.45%(n=11, c=0.1μg/mL )，加标回收率在94.5%～102.5%之间。用于实际水样中铅的测定，结果满意。
본문제출료납미 Ti02분리부집화염원자흡수광보법측정수양중흔량연적신방법。고찰료연재납미 Ti02상적흡부동역학、최가산도화흡부용량。실험결과표명：재최가실험조건하，납미 Ti02능정량、쾌속지흡부수중함유적흔량 Pb2+，기정태흡부용량위17.9 mg/g。흡부재납미 Ti02상적 Pb2+가용0.1 mol/L HNO3+0.1 mol/LCH3COOH 완전세탈。본법대 Pb2+적검출한위2.57 ng/mL,상대표준편차위2.45%(n=11, c=0.1μg/mL )，가표회수솔재94.5%～102.5%지간。용우실제수양중연적측정，결과만의。
A new method for the determination of trace Pb based on nanometer-size TiO2 separation and preconcentration with FAAS was proposed. The optimum conditions for adsorption were studied in detail, and the test included sorption kinetics, effect of pH on adsorption ratio, and adsorption capacity. Under the optimum conditions, Pb2+ could be adsorbed and recovered quantitatively. The static adsorption capacity of Pb2+ on nanoneter-size TiO2 was 17.9mg/g, and 0.1mol/L HNO3 + 0.1 mol/LCH3COOH was sufficient for complete elution. The detection limit of this method for Pb2+ was 2.57ng/mL, and relative standard deviation was 2.45% (n=11, c=0.1μg/mL). The recoveries of Pb2+ ranged from 94.5% to 102.5%. The proposed method has been applied for the determination of trace Pb in water samples with satisfactory results.