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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 was combined with graphite furnace atomic absorption spectrometry to C18 reversed-phase bonded silica as the column material, sodium diethyldithiocarbamate as chelating agent and ethanol as eluent to immobilize Volumetric elution methods were used to determine the concentration of Cd, Cu and Fe. The enrichment factors were 40, 29 and 18, respectively (compared with 30 uL injection). The detection limits (3σ) were 0 and 0 respectively. 4,3. 0 and 22 ng / L.