Liang Pei, Yang Lanhao, Hu Bin, Jiang Zucheng
Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China.
Anal Sci. 2003 Aug;19(8):1167-71. doi: 10.2116/analsci.19.1167.
Titanium dioxide nanoparticle dynamically loaded with 8-hydroxyquinoline (nanometer TiO2-Oxine) was used as a solid-phase extractant for the preconcentration of trace amounts of aluminum(III) and chromium(III) prior to their determination by inductively coupled plasma atomic emission spectrometry (ICP-AES). The optimal conditions for preparing nanometer TiO2-Oxine were obtained. Also, the separation/preconcentration conditions of analytes, including the effects of the pH, the sample flow rate and the volume, the elution solution and the interfering ions on the recovery of the analytes were investigated. At pH 6.0, the adsorption capacity of nanometer TiO2-Oxine was found to be 5.23 mg g(-1) and 9.58 mg g(-1) for Al(III) and Cr(III), respectively. An enrichment factor of 50 was achieved by this method, and the detection limits (3sigma) for Al(III) and Cr(III) were 1.96 and 0.32 microg L(-1) respectively. The proposed method was applied for the determination of trace Al(III) and Cr(III) in biological samples and lake water with satisfactory results.
负载8-羟基喹啉的二氧化钛纳米颗粒（纳米TiO₂-8-羟基喹啉）被用作固相萃取剂，用于在通过电感耦合等离子体原子发射光谱法（ICP-AES）测定痕量铝（III）和铬（III）之前对其进行预富集。获得了制备纳米TiO₂-8-羟基喹啉的最佳条件。此外，还研究了分析物的分离/预富集条件，包括pH值、样品流速和体积、洗脱溶液以及干扰离子对分析物回收率的影响。在pH 6.0时，发现纳米TiO₂-8-羟基喹啉对Al（III）和Cr（III）的吸附容量分别为5.23 mg g⁻¹和9.58 mg g⁻¹。该方法实现了50倍的富集因子，Al（III）和Cr（III）的检测限（3σ）分别为1.96和0.32 μg L⁻¹。该方法应用于生物样品和湖水中痕量Al（III）和Cr（III）的测定，结果令人满意。
