流动注射编结反应器火焰原子吸收光谱法测定水样中三价铁和二价铁  

Flow injection-knotted reactor coupled with flame atomic absorption spectrometry for the determination of iron(Ⅱ) and iron(Ⅲ) in water samples

作　　者：王中瑗[1] 张宏康[2] 方宏达[1] 苏耀东[3] MITTAL G S 

机构地区：[1]国家海洋局南海环境监测中心,广东广州510300 [2]仲恺农业工程学院轻工食品学院,广东广州510225 [3]同济大学化学系,上海200092 [4]University of Guelph, Guelph NIG 2W1 Canada

出　　处：《冶金分析》2012年第4期57-61,共5页Metallurgical Analysis

基　　金：国家自然科学基金(No.29973029)资助项目

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%。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 %.

关 键 词：流动注射 非分离状态 铁(Ⅱ) 铁(Ⅲ) 

分 类 号：O657.31[理学—分析化学]