比较微波消解-原子荧光法和电感耦合等离子体质谱法测定饲料中总砷

Comparison of microwave digestion-atomic fluorescence spectrometry and inductively coupled plasma mass spectrometry for the determination of total arsenic in feed sample

中文关键词:  微波消解  原子荧光光谱法  电感耦合等离子体质谱法  饲料  砷

英文关键词:microwave digestion  atomic fluorescence spectrometry  inductively coupled plasma mass spectrometry  feed  arsenic

中文摘要:

      目的 对比微波消解-原子荧光法和电感耦合等离子体质谱法测定饲料中总砷含量。方法 采用微波消解作为样品前处理手段, 原子荧光法和电感耦合等离子体质谱法作为检测方法, 采用标准物质对两种方法进行验证。结果 微波消解-原子荧光法检出限为0.006 mg/kg, 线性相关系数为0.9998, 相对标准偏差为6.3%和3.2%; 微波消解-电感耦合等离子体质谱法检出限为0.003 mg/kg, 线性相关系数为0.9999, 相对标准偏差为2.4%和2.6%。2种方法对标准物质的测定结果均在标准值允许范围内。结论 2种方法均操作简便快速, 具有较低的检出限、较高的准确度和精密度, 其中原子荧光法适合批量样品分析, 电感耦合等离子体质谱法适用于总砷含量较高的样品。

英文摘要:

      Objective To compare the microwave digestion-atomic fluorescence spectrometry and inductively coupled plasma mass spectrometry for the determination of total arsenic in feed. Methods Microwave digestion was used as the sample preparation method, atomic fluorescence and inductively coupled plasma mass spectrometry were used as detection methods, and a standard substance was used for validation test. Results Under the selected experimental conditions, the detection limit of microwave digestion-atomic fluorescence method was 0.006 mg/kg, the linear correlation coefficient was 0.9998, and the relative standard deviations were 6.3% and 3.2%, the detection limit of microwave digestion-inductively coupled plasma mass spectrometry was 0.003 mg/kg, the linear correlation coefficient was 0.9999, and the relative standard deviations were 2.4% and 2.6%. The validation test results of both methods were in accordance with standard value. Conclusion The two methods are simple and rapid to operate, with low detection limit, high accuracy and precision. Atomic fluorescence method is suitable for batch sample analysis, and inductively coupled plasma mass spectrometry is suitable for samples with high total arsenic content.