无公害食品中铅GFAAS仪器测定条件图谱扫描优化分析

Optimum Analysis in GFAAS Map Scanning of Conditions for Determining Pb in Green Food

扫描不同测定条件下铅石墨炉原子吸收信号的图谱,通过分析图谱的变化参数,直观地优化测定条件。分析结果表明:扫描图谱可快速优化铅石墨炉原子吸收的测定条件(灯电流、狭缝、干燥温度/时间、灰化温度/时间、原子化温度/时间等),大大减少分析干扰,提高分析结果的准确度。分别对几种水果蔬菜样品的测试,加标回收率均在(100±3)%内。测试国家标准物质,其结果落在标准值范围。

Pb absorption signals were scanned by graphite furnace atomic absorption spectrometry (GFAAS) , and conditions for determining Pb were visually optimized based on the analysis of changes of the map parameters. Analysis results showed that map scanning rapidly optimized conditions for determining Pb by GFAAS, such as electric current of the lamb, narrow space, drying temperature/time, dry ashing temperature/time, atomization temperature/time, which reduced largely analysis interruptions and increased the acc...