用等离子体原子发射光谱法研究纳米二氧化钛对钨酸根离子的吸附行为

Study on Adsorption Properties of WO_4 ^(2-)on Nanometer-size TiO_2 with Inductively Coupled Plasma-Atomic Emission Spectrometry

利用纳米二氧化钛 (TiO2 )比表面积大 ,吸附能力强的特点 ,采用ICP AES检测手段系统地研究了纳米TiO2 对钨酸根离子 (WO2 -4)的吸附行为 ,详细考察了影响吸附和解脱的主要因素 ,以及共存离子的干扰影响。在优化的实验条件下 ,本法测定W 的检出限为 0 .0 4 4 μg g ,相对标准偏差RSD =2 .3% (n =9,C =5 .0mg L)。本法已应用于水系沉积物 (GBW0 730 2 )中W的测定 。

Using the higher specific surface area and adsorption characteristics of nanometer TiO 2, a method coupled with inductively coupled plasma atomic emission spectrometry (ICP AES) was proposed for the determination of WO 2- 4. The adsorption behavior of nanometer TiO 2towards WO 2- 4 was investigated by ICP AES. Effect of the adsorption, elution solution and interfering ions on the recovery has been investigated. Under optimum condition,the limit of detection of W? was 0.044 μg/g, and RSD was 2.3% ( n =9, C =5.0 mg/L). The method has been applied to the analysis of geological sample with satisfactory results.