环境水样中痕量Fe^(3+)的测定方法研究  

STUDY ON DETECTION METHOD FOR TRACE FE(III)IN ENVIRONMENT WATER SAMPLE

作　　者：郭芳 陈新 

机构地区：[1]河南平顶山市石油公司,河南平顶山467000 [2]平顶山市城市规划设计研究院,河南平顶山467000

出　　处：《石油化工环境保护》2006年第2期51-53,共3页Environment Protection in Petrochemical Industry

摘　　要：在酸性介质中(pH5.0),Fe3+能与硫氰酸盐生成稳定的配离子[Fe(SCN)6]3-,该配阴离子能与碱性717型阴离子交换树脂定量交换缔合,形成阴离子交换树脂(R+)———金属离子(Mn+)———硫氰酸盐(SCN-)三元配合缔合体系,其最大吸收波长分别为490μm,与二元水相最大吸收波长相同,通过制作薄层测定了水中Fe3+含量。本法具有较高的灵敏度ε630Fe3+=2.4×105L·mol-1·cm-1,测定0.6μgFe3+6次,RSD=2.7%,实测了水样中,Fe3+含量并与AAS法测定结果比较,Fe3+测定的线性范围0～10μg/25mL,体系检出限为0.12μmol/L。At 5.0 pH, a ternary association complex system which was formed by , Fe (III) and 717 strong alkalescence anion exchange resin, has the largest absorbance at the wavelength of 490 nm. With the three association complex system, the sensitivity was 48 times larger than that in water solution, based on the increase of absorbance sectional surface and the pelectron free space of the Fe complex in the resin phase. The RSD of the overall method was 2.7% (n=6) for 6.0μg/mL. The developed method was applied in the determination of trace Fe (III) surface water, the linear range of 0-10μg/25mL and detection limit of 0.12μmol·L-1 were achieved.

关 键 词：三元缔合体系 吸光光度法 薄层树脂相 铁 

分 类 号：O614.811[理学—无机化学] X832[理学—化学]