摘要
以石墨炉原子吸收(GFAAS)为检测手段,研究了纳米二氧化钛(TiO2,锐钛型)对金属Cd(Ⅱ)的吸附性能,考察了吸附和解吸的主要影响因素。结果表明,在较宽的pH范围内,纳米TiO2对Cd(Ⅱ)具有良好的吸附性能,3·0mol/L HCl能将所吸附的Cd(Ⅱ)完全洗脱。在优化的实验条件下,具有吸附容量大、吸附速度快的特点。本法的检出限(3σ)为10·6ng/L;相对标准偏差(RSD)为1·5%,(n=7,C=2·0μg/L),富集50倍。本法测定标准样品的测定值与参考值吻合。用于土壤类样品中Cd(Ⅱ)的测定,结果令人满意。
A new method was proposed for the determination of Cd（Ⅱ） using nanometer sized TiO2 （anatase） as solid phase extractant and detected by graphite furnace atomic absorption spectroscopy （GFAAS）. The adsorption and desorption behavior of nanometer TiO2 towards Cd（Ⅱ） was investigated. It was found that the adsorption fraction of Cd（Ⅱ） was 97% at pH 8.0 and the elution with 3.0 mol/L HCl was sufficient for Cd（Ⅱ）. The detection limit（3σ） was 10.6 ng/L and RSD was 1.5% （n = 7, C = 2.0 μg/L）. The preconcentration factor was 50. The method was applied to the determination of Cd（Ⅱ） in environmental samples and satisfactory results were obtained.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2006年第U09期223-226,共4页
Chinese Journal of Analytical Chemistry
基金
物理化学江苏省国家重点学科培育点科研项目开放基金资助
关键词
纳米二氧化钛
镉
吸附
石墨炉原子吸收光谱
Nanometer aized titanium dioxide, cadmium, adsorption, graphite furnace atomic absorption spectroscopy
