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采用原子吸收分光光度计,测定工业级碳酸锂中Pb的含量,分别进行标准曲线法,标准加入法,基体匹配法的实验研究。在选定的仪器测定条件下,采用标准加入法和基体匹配法所测得的工业级碳酸锂中的Pb含量与标准曲线法所测得的结果相比较无显著性差异,线性相关系数均大于0.999,相对标准偏差在1.4%~1.9%之间,回收率在112.5%~114.2%之间。可直接采用标准曲线法进行工业级Li2CO3中Pb的测定。
The atomic absorption spectrophotometer was used to determine the content of Pb in industrial grade lithium carbonate. The standard curve method, standard addition method and matrix matching method were used respectively. Under the condition of the selected instruments, there is no significant difference between the Pb content in industrial grade lithium carbonate measured by standard addition method and matrix matching method, and the linear correlation coefficient is greater than 0.999, the relative standard deviation of 1.4% to 1.9%, the recovery rate of 112.5% to 114.2%. The standard curve method can be used for the determination of Pb in industrial grade Li2CO3 directly.