石墨炉原子吸收法测定食品接触材料制品中有害重金属迁移量

Determination of harmful heavy metals in food contact materials by graphite furnace atomic absorption spectrometry

目的建立一种石墨炉原子吸收法测定聚乙烯制品、聚丙烯制品和三聚氰胺成型品中铅、镉、铬迁移量的检测方法。方法筛选石墨炉原子吸收光谱仪测定铅、镉、铬的最佳灰化温度、原子化温度,采用正交设计仪器参数确定仪器最佳工作条件,测定聚乙烯制品、聚丙烯制品和三聚氰胺成型品中铅、镉、铬迁移量的检出限、重复性、回收率和精密度。结果在最佳试验条件下,铅、镉、铬的线性范围为0~150、0~5、0~100μg/L,检出限为1.04、0.05、0.98μg/L,加标回收率为96.5%~104.0%,样品测定的相对标准偏差均小于5%。结论该方法快速、准确、可靠,可作为食品接触材料制品中铅、镉、铬迁移量的测定方法。

ABSTRACT:Objective To establish a method for the migration determination of lead, cadmium and chromium in polyethylene products, polypropylene products and melamine products by graphite furnace atomic absorption spectrometry.MethodsThe optimum ashing temperature, atomization temperature of determination condition of lead, cadmium and chromiumwere screened.The optimum operating conditions were determined by orthogonal design. The detection limit, repeatability, recovery rate and precision of the migration of lead, cadmium and chromium in polyethylene products, polypropylene products and melamine products were measured.ResultsUnder the optimum conditions, the linear range of lead, cadmium, and chromium for 0~150, 0~5, and 0~100 μg/L, the detection limit was 1.04, 0.05 and 0.98 μg/L, the recovery rate was of 96.5%~104.0%, and determination of the relative standard deviation was less than 5%. ConclusionThis method is fast, accurate and reliable, and can be used as a method for the determination of lead, cadmium and chromium in food contact materials.