钨丝电沉积石墨炉原子吸收光谱法测定食品中不稳定态铅

Determination of Labile Lead in Foods by Graphite Furnace Atomic Absorption Spectrometry after Electrodeposition on A Tungsten Loop

研究了钨丝电沉积石墨炉原子吸收光谱法测定不稳定态铅的条件。结果表明该方法的灵敏度比常规ＣＦＡＡＳ法提高８０倍，检出限为０．０１μｇ．Ｌ－１；变异系数４．５％，在０－２．５μｇ·Ｌ－１范围内线性关系好，抗干扰强。测定了食品中不稳定态铅。

A new method for determination of labile lead by graphite furnace atomic absorption spectrometry(GFAAS)after electrodeposition on a tungsten loop is proposed.The results show that the sensitivity of lead may be increased 80-folol in comparison with conventional GFAAs.The coefficient of variation is 4.5% and the detection limit is 0.01μg.L-1.The linear range of the calibration curve is 0￣2.5μg.L-1.The labile lead in foods have been determined.