研究了 IRC-71 8离子交换树脂、 1 2 2螯合树脂和 Muromac A-1树脂对镉的预浓集条件 ,建立了超痕量镉的流动注射在线吸着分离预浓集冷蒸气发生原子吸收光谱测定方法 .在每小时进样 60 ,60和 4 5次速度下检出限 ( 3σ)分别为 3.0 ,3.0和 2 .4 ng/L.线性范围 0～ 0 .3μg/L,对 0 .2 μg/L镉测定的相对标准偏差为2 .0 %～ 2 .6% ( n=1 1 ) .讨论了用这 3种离子交换树脂微柱进行分离预浓集时条件参数的优化、抗干扰能力以及对天然水样的回收率 ,并分别进行了水样的测定 Preconcentration conditions of cadmium with IRC-71 8 ion exchange resin, 1 2 2 chelating resin and Muromac A-1 resin were studied. Flow injection of ultra-trace cadmium was established. On-line sorption separation preconcentration of cold vapor generated atomic absorption The method of spectrophotometric detection showed that the detection limits (3σ) were 3.0, 3.0 and 2. 4 ng / L at 60, 60 and 45 times per hour, respectively. The linear range was 0 ~ 0.3μg / L, The relative standard deviation of determination of 2 μg / L cadmium was 2.0% ~ 2.6% (n = 1 1). The optimization of parameters of conditions for separation and preconcentration with these three kinds of ion exchange resins was discussed. Interference ability and the recovery of natural water samples, and were measured water samples