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建立了在表面活性剂(十二烷基硫酸钠)的活化作用下,铜试剂修饰的纳米TiO2分离富集,电感耦合等离子体原子发射光谱(ICP-AES)测定Cu2+、Pb2+和Zn2+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 4.0,Cu2+、Pb2+和Zn2+可被铜试剂修饰的纳米TiO2定量富集,吸附的金属离子可用2.0 mL0.10 mol/L HCl溶液完全洗脱。在优化的实验条件下,铜试剂修饰的纳米TiO2对Cu2+、Pb2+和Zn2+的吸附容量分别为6.2,18.6和6.9 mg/g。本法对Cu2+、Pb2+和Zn2+的检出限(3σ)分别为:0.32,1.68和0.39 ng/mL,相对标准偏差(RSD)分别为3.4%、3.7%和4.8%(n=11,c=50 ng/mL)。本法应用于环境样品和黄芪标准样品(GBW 10028)中Cu2+、Pb2+和Zn2+的测定,测定值与标准值基本吻合,分析结果满意。
A new method for the determination of Cu2 +, Pb2 + and Zn2 + with nano-TiO2 modified by copper reagent and enrichment with copper sulfate and sodium dodecyl sulfate (ICP-AES) was established. . The effects of pH, elution conditions and interference ions on the separation and enrichment of analytes were investigated. The results show that Cu2 +, Pb2 + and Zn2 + can be quantitatively enriched with nano-TiO2 modified with copper reagent at pH 4.0. The adsorbed metal ions can be completely eluted with 2.0 mL 0.10 mol / L HCl solution. Under optimized experimental conditions, the adsorption capacity of Cu2 +, Pb2 + and Zn2 + by the copper reagent modified nano-TiO2 was 6.2, 18.6 and 6.9 mg / g, respectively. The detection limits (3σ) for Cu2 +, Pb2 + and Zn2 + were 0.32, 1.68 and 0.39 ng / mL, respectively. The relative standard deviations (RSDs) were 3.4%, 3.7% and 4.8% 50 ng / mL). The method is applied to the determination of Cu2 +, Pb2 + and Zn2 + in environmental samples and Astragalus standard samples (GBW 10028). The measured values are in good agreement with the standard values and the results are satisfactory.