直接固体进样石墨炉原子吸收光谱法测定食品包装纸中铅镉

DETERMINATION OF Pb AND Cd ELEMENTS IN PAPER FOR FOOD-PACKAGING BY SS-GFAAS

[目的]建立直接固体进样测定食品包装纸中铅、镉的方法。[方法]采用德国耶拿分析仪器股份有限公司的ZEEnit600型原子吸收光谱仪进行测定。[结果]测定μg和mg级固体样品的精密度在3.3%～10.6%之间,铅、镉检出限为0.002ng/mL和0.001ng/mL。[结论]与湿法消解方法相比较,该方法无需样品前处理,具有简便、快速特点,同时可避免样品的稀释以及试剂的交叉污染带来的分析误差。

A direct solid sample inducing method is introduced for the detection of Pb and Cd in paper for food-packaging by AAS ZEEnit 600, AnalytikJena AG. The analysis was made without digestion chemicals; the RSD was between3.3 %- 10.6 % （n = 7）, the detection limits are 0.002ng and 0.001ng for Pb and Cd respectively. Compared with liquid sampling graphite furnace AAS analysis,the Direct SS-GFAAS proved to be a good alternative to conventional methods of trace analysis after wet-chemical digestion and compared favorably with these methods, it can save a lot of work for sample processing, has benefits to avoid dilution and external contamination.