采用石墨消解-火焰原子吸收分光光度法来测定谷物黄豆和大米中4种微量元素:钙、镁、锰、锌。用该方法测得黄豆和大米中钙、镁、锰、锌的检出限分别为0.073 0,0.002 8,0.007 0,0.005 1μg/mL;回收率分别是101.60%,97.82%,95.74%,96.13%;精密度分别是1.5%,1.6%,2.3%,1.9%。适用于谷物中微量元素的测量。