低温蒸发金属PMBP螯合物的ETV-ICP-AES技术研究

本文以1－苯基－3－甲基－4－苯甲酰基－吡唑酮－5（PMBP）为化学改进剂，提出低温蒸发金属PMBP气态螯合的ETV－ICP－AES新技术，对影响螯合物的形成及其蒸发行为的因素进行了研究，在优化的实验条件下，方法测定镧，铕，铝和铁的检出限分别为8.0ng/mL、0．9ng/mL、0．6ng/mL和3．2ng/mL；相对标准偏差分别为3．3％，3．4％、4．7％和3．9％，已将本法用于标准参考机动车尾气尘粒和米粉试样中的痕量镧，铕，铝和铁的测定，结果与标准值吻合。

Study on Low Temperature Sample Introduction of Gaseous Metal PMBP Chelates in ETV-ICP-AES

Using the reagent of 1-phenyl-3-methyl-4-benzoylpyrazolone (PMBP) as a chemical modifier, a new technique of low temperature sample introduction of gaseous metal PMBP chelates in ETV-ICP-AES was proposed and applied for the determination of trace elements in this work. The factors of affecting the formation of metal PMBP chelates and their vaporization behavior were investigated in detail. Under the optimized conditions, the detection limits for lanthanum, europium, aluminum and iron were 8.0 ng/mL, 0.9 ng/mL, 0.6 ng/mL and 3.2 ng/mL, respectively, and the corresponding relative standard deviations were 3.3%, 3.4%, 4.7% and 3.9%, respectively. The proposed method was applied to the determination of trace analytes in standard reference materials of vehicle exhaust particulate and rice flour. The results well agreed with the certified values.