流动注射在线分离富集与石墨炉原子吸收光谱法联用的研究

Flow Injection On -Line Preconcentration -Graphite Furnace Atomic Absorption Spectrometry for the Determination of Cadmium, Copper and Nickel

将流动注射在线预富集系统与石墨炉原子吸收光谱法联用，以Ｃ１８反相键合硅胶为柱材料，以二乙基二硫代氨基甲酸钠为螯合剂，乙醇为洗脱液，以固定体积洗脱方式测定了Ｃｄ、 Ｃｕ和 Ｆｅ，富集倍数分别为 ４０、２９和 １８（与 ３０ ｕＬ进样量相比），检出限（３σ）分别为 ０． ４、３． ０和 ２２ ｎｇ／Ｌ。

The flow injection on-line preconcentration system is combined with graphite furnace atomic absorption spectrometry. Bounded silica gel with octadecyl functional group (C18 ) was used as column-packing material. Sodium diethyldithiocarbamate was used as chelating agent and ethanol was used as eluant. Based on the way of volume-controlled eluate zone sampling, the enrichment factors for the determination of Cd,Cu and Fe are 40, 29 and 18, respectively. The detection limits(3σ) are 0. 4, 3. 0 and22 ug/L for Cd, Cu and Fe, respectively.