食盐中痕量铅含量测定的研究

Study on detection of trace content of lead in salt

中文关键词:  铅  食盐  抗坏血酸

英文关键词:lead  salt  ascorbic acid

中文摘要:

      目的 采用标准加入法-抗坏血酸基体改进剂消除食盐的基体干扰, 建立了标准加入法-抗坏血酸基体 改进剂测定食盐中痕量铅的方法。 方法 采用抗坏血酸为基体改进剂降低铅的原子化温度, 分析元素在大量样 品基体挥发前完成原子化, 使原子吸收信号与背景信号相互分离, 结合标准加入法, 测量值在相同干扰情况下 获得, 使测定结果更为准确可靠。结果 该方法能有效消除大量样品基体的干扰, 方法检出限为 0.1 mg/kg, 精 密度为 1.9％~3.3％, 回收率为 88％~105％。结论 采用标准加入法-抗坏血酸基体改进剂, 可准确分析食盐中 痕量铅, 该方法简单、快速, 检出限符合分析要求。

英文摘要:

      Objective Standard addition of ascorbic acid matrix modifier method was used to eliminate the salt matrix interference, and the method of standard addition method with ascorbic acid matrix modifier to detect the trace lead in salt was established. Methods Ascorbic acid was used as matrix modifiers to reduce the atomi- zation temperature of lead, and the analyzed elements were atomized before the evaporation of a large number of sample-based body, which made the atomic absorption signal separated from the background signal. Combined with the standard addition method, the measured values in the case of the same interference were obtained, so that the measurement results were more accurate and reliable. Results This method could effectively eliminate a large number of sample matrix interference, the detection limit was 0.1 mg/kg, the precision was from 1.9% to 3.3%, and the recovery was from 88% to 105%. Conclusion The standard addition method with ascorbic acid matrix modifier could accurately analyze the trace content of lead in salt. It was simple and fast, and the detection limit could fit the requirements of analysis.