饮料中镉的含量极低，测定极低量镉需用石墨炉原子吸收法，但仪器昂贵不能广泛应用。而常规火焰原子吸收法，由于样品利用率低（仅有5％～10％的溶液进人火焰），限制了测定的灵敏度和检出限。1976年Lau等［1］首次在空气／乙炔火焰中，安装了一个冷却石英管，它起到了“原子捕 Low levels of cadmium in beverages, determination of very low levels of cadmium required graphite furnace atomic absorption method, but expensive instruments can not be widely used. The conventional flame atomic absorption method, due to the low utilization of the sample (only 5% to 10% of the solution into the flame), limiting the sensitivity and detection limits. In 1976, Lau et al [1] installed a cooled quartz tube for the first time in an air / acetylene flame, which played the role of "atomic catching