中文摘要：

建立了流动注射（FI）编结反应器（KR）在线预富集与火焰原子吸收光谱（FAAS）联用非分离状态下测定铁的价态的新方法。先用FAAS测出Fe（Ⅱ）和Fe（Ⅲ）的总浓度,然后通过FI-KR预富集FAAS检测之后所得到的浓集系数（EF）的差异,求出Fe（Ⅱ）和Fe（Ⅲ）的浓度比值,根据总浓度和浓度比值求出Fe（Ⅱ）和Fe（Ⅲ）各自的浓度。对络合剂的种类、流速和浓度及体系pH值、样品进样时间和流速、洗脱剂种类和流速对测定的影响进行了研究,并确定了最佳实验条件。采用本方法对实际水样进行测定,结果与邻菲啰啉分光光度法相一致,相对标准偏差（n=11）均小于3.8%。

英文摘要：

A new determination method of Fe（Ⅱ） and Fe（Ⅲ） without separation was established by flow injection（FI） knitted reactor（KR） on-line pre-enrichment and flame atomic absorption spectrometry（FAAS）.The total content of Fe（Ⅱ） and Fe（Ⅲ） was firstly determined by FAAS.Then,based on the difference of enrichment factor（EF） after FI-KR pre-enrichment and FAAS detection,the concentration ratio between Fe（Ⅱ） and Fe（Ⅲ） was obtained.Consequently,the content of Fe（Ⅱ） and Fe（Ⅲ） could be calculated.The influencing factors on determination,including the type,flow rate and concentration of complex reagent,system pH,sampling time and flow rate,and the type and flow rate of eluent,were studied.The optimal experimental conditions were obtained.The proposed method was applied to the determination of actual water sample,and the results were consistent with those obtained by o-phen spectrophotometry.The relative standard deviations（RSD,n=11,%） were less than 3.8 %.