关键词: 微波消解, 石墨炉原子吸收光谱法, 水果和蔬菜, Pb, Cr, Cd

Abstract:

An effective method was developed for continuous determination of Pb, Cr and Cd in fruit and vegetable by using graphite furnace atomic absorption spectrometry (GFAAS) with microwave digestion. The effects of digestive reagent, digestion time and temperature on sample preparation were discussed, and the determination conditions by GFAAS were optimized. Under the optimum conditions, the linear ranges of Pb, Cr and Cd were 0 to 40 μg/L, 0 to 80 μg/L and 0 to 3μg/L and their detection limits were 0.293 μg/L, 0.037 μg/L and 0.850 μg/L, respectively. The precision relative standard deviations were between 2. 1% and 5.3% for determining the above three elements in flowering Chinese cabbage and snow pear by this method, and the spike recoveries range from 95.0% to 101.9%.

Key words: microwave digestion, graphite furnace atomic absorption spectrometry, fruit, vegetable, lead, chromium, cadmium