流动注射在线离子交换预富集原子吸收光谱法测定食品环境样品中痕量镉

Fiow-injection AAS determination of trace amounts of Cadmium in alimental and enviromental sample after its preconcentration of ionexchange on line

研究了配有螯合树脂微型柱的流动注射预富集———原子吸收光谱联用技术 ,建立了痕量镉的流动注射离子交换预富集原子吸收光谱测定方法 ,单柱预浓集 2 0min ,预浓集高达 3 2倍 ,检出限为 0 .1 0 μg/L ,对于同浓度的样品平行测定 1 1次 ,其相对偏差为 3 .2 %,加标回收率在 96 %～ 1 0 1 5 %.

Flow-injection AAS after its preconcentration of ion exchange of trace of cadmium is established through the study of Flow-injection AAS with chelate minisize column.Single column preconcentrating for 2.0 minutes,the rate of enrichment factor is up to 32 times.The limit of detection is 0.10μg/L.Parallel sample mensurate for 11 times under the same concentration.the relative standard deviation is 3.2%.The recoveries for the added slandards are between 96～101.5%.