摘要
建立了在表面活性剂十二烷基硫酸钠(SLS)的活化作用下,桑色素修饰的纳米TiO2分离富集,电感耦合等离子体原子发射光谱(ICP-AES)测定Cr3+和A l3+的新方法。考察了溶液pH、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 3.0时,Cr3+和A l3+可被桑色素修饰的纳米TiO2定量富集,吸附的金属离子可用1.5 mL 0.50 mol/L HC l溶液完全洗脱。在优化的实验条件下,纳米TiO2-桑色素对Cr3+和A l3+的吸附容量分别为9.69 mg/g和12.76 mg/g。本法对Cr3+和A l3+的检出限(3σ)分别为:0.21和0.49 ng/mL,相对标准偏差(RSD)分别为2.2%和1.6%(n=11,C=50 ng/mL)。本法应用于藏药和扇贝标准样品(GBW 10024)中Cr3+和A l3+的测定,测定值与标准值基本吻合,分析结果满意。
Nanometer TiO2 was modified with tetrahydroxyflavanol under the activation of surfactant（SLS） and used for preconcentration of trace metal ions.The adsorption behavior of Cr（III） and Al（III） on nanometer TiO2-tetrahydroxyflavanol was investigated.At pH3.0,Cr（III） and Al（III） were retained on the nanometer TiO2-tetrahydroxyflavanol,then eluted with 0.50 mol/L HCl and determined by ICP-AES.The adsorption capacity of modified nanometer TiO2-tetrahydroxyflavanol was found to be 9.69 mg/g and 12.76 mg/g for Cr（III） and Al（III）,respectively.The precision（RSD） and the detection limit（3σ） of the method were 2.2 %,1.6 %（n = 11,ρ= 50 ng/mL） and 0.21,0.49 ng/mL,respectively.The method was validated by analyzing standard reference material（GBW 10024）,the results obtained are in good agreement with standard values.The developed method was successfully applied to the determination of trace Cr（III） and Al（III） in Tibetan medicine samples with satisfactory results.
出处
《分析试验室》
CAS
CSCD
北大核心
2011年第7期22-25,共4页
Chinese Journal of Analysis Laboratory
基金
青海省科技厅项目(2010-Z-716)
教育部科学技术研究重点项目(208155)资助
