摘要
建立了纳米二氧化钛分离富集 ,电感耦合等离子体原子发射光谱 (ICP AES)测定镉、钴和锌的新方法。考察了溶液 pH值、洗脱条件和干扰离子等因素对分析物分离富集的影响。结果表明 ,在pH 9~ 10范围内 ,Cd ,Co和Zn可被纳米TiO2 定量富集 ,吸附于纳米TiO2 上的金属离子可用 0 . 1mol·L-1的硝酸溶液完全解脱。在优化的实验条件下 ,纳米TiO2 对Cd ,Co和Zn的吸附容量分别为 8 1,6 9和 15 1mg·g-1。本法对Cd ,Co和Zn的检出限 (3σ)分别为 :5 . 1,3. 4和 2 . 9ng·mL-1,相对标准偏差 (RSD)分别为 4 .3% ,4 .6 %和 4 . 9% (n =9,c=0 1μg·mL-1)。该方法已成功地应用于环境样品中镉、钴和锌的测定 ,分析结果满意。
The adsorption behavior of Cd, Co and Zn on nanometer-size TiO2 was investigated. At pH 9.0, Cd, Co and Zn were retained on the nanometer-size TiO2, then eluted with 0.1 mol(.)L(-1) HNO3 and determined by ICP-AES. The adsorption capacities of nanometer TiO2 were found to be 8.1, 6.9 and 15.1 mg(.)g(-1) for Cd, Co and Zn respectively. The detection limits (3 sigma) for Cd, Co and Zn are 5.1, 3.4 and 2.9 ng (.) mL(-1) respectively. The proposed method has been applied to the determination of trace Cd, Co and Zn in environmental samples with satisfactory results.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2005年第3期444-446,共3页
Spectroscopy and Spectral Analysis