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众所周知,直接用金属或合金作为电极的光谱分析,铅的检出限为0.001%,低于此含量的分析大都采用化学光谱法,即将其转化为氧化物的粉末法。但分析流程长,还要消耗一定量的高纯试剂。所以,在成本及时间上并不优于化学法。而高纯锡中的杂质元素铅的含量大约在0.002%左右。化学分析是采用双硫腙比色法。化学光谱法是将主要元素锡氯化挥发后,用优级纯盐酸、硝酸混合液溶解其残渣,再转移至涂有封闭剂(如聚苯乙稀)的平头石墨电极上,用红外灯烘干。最后用高压电容火花光源激发的方法测定其含量。对于少量试样,显然在成本
As we all know, the direct use of metal or alloy as the electrode spectroscopy, lead detection limit of 0.001%, below this content analysis mostly using chemical spectroscopy, that is, to convert it into oxide powder method. But the analysis process is long, but also consume a certain amount of high purity reagents. Therefore, the cost and time is not superior to the chemical method. The high purity tin in the impurity element lead content of about 0.002% or so. Chemical analysis is the use of dithizone colorimetric method. Chemiluminescence spectroscopy is the main element after tin chlorination volatilization, with excellent grade pure hydrochloric acid, nitric acid mixture to dissolve the residue, and then transferred to a sealing agent (such as polystyrene) flat graphite electrodes, baking with infrared light dry. Finally, high-voltage capacitor spark source excitation method for the determination of its content. For a small amount of sample, obviously at cost