微波消解-火焰原子吸收光谱法测定钢铁厂废旧除尘布袋中重金属

Determination of Metals in Waste Bag Filter of Steel Works by Microwave Digestion-Flame Atomic Absorption Spectrometry

采用微波消解—火焰原子吸收光谱法(FAAS)测定某钢铁公司五种废旧除尘布袋中Cu,Zn,Pb,Cd,Cr,Ni六种重金属元素总量,在国内首次研究了六种消解酸体系对废旧除尘布袋样品中重金属的消解效果。该方法的相对标准偏差(RSD)为1.02%～4.35%,平均回收率为87.7%～105.6%。研究表明,该方法操作简便、快速、准确、重复性好,适合于废旧除尘布袋中重金属含量的测定。试验分析结果表明,应根据不同布袋的特性差异,采用不同的消解体系;不同工序废旧除尘布袋样品中重金属含量差异较大,其中Pb、Zn元素含量最高,Cu,Ni,Cd,Cr等元素的含量相对较低。该测定结果为废旧除尘布袋的进一步处理处置研究提供了科学依据。

A method of microwave digestion technique-flame atomic absorption spectrometry was proposed to determine the total contents of Cu, Zn, Ph, CA, Cr and Ni in five different kinds of waste bag filters from a steel plant. The digestion effects of the six acid systems on the heavy metals digestion were studied for the first time. The relative standard deviation （RSD） of the method was between 1.02% and 9.35%, and the recovery rates obtained by standard addition method ranged from 87. 7% to 105.6M. The results indicated that the proposed method exhibited the advantages of simplicity, speediness, accuracy and re- peatability, and it was suitable for determining the metal elements of the waste bag filter. The results also showed that different digestion systems should be used according to different waste bag filters. The waste bag filter samples from different production processes had different metal elements content. The Pb and Zn were the highest in the waste bag filters, while the Cu, Ni, CA and Cr were relatively lower. These determination results provided the scientific data for further treatment and disposal of the waste bag filter.