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吖啶红共振散射光谱法测定痕量铁(Ⅲ)

宋仲容,邹容,何家洪,徐强*   

  1. (重庆文理学院化学与环境工程学院 重庆 402168)
  • 收稿日期:2011-06-28 修回日期:2011-09-24 出版日期:2012-05-10 发布日期:2012-05-10
  • 通讯作者: 徐强,教授; Tel:023-49392182; Fax:023-49682200; E-mail:szr1688@163.com; 研究方向：配位化学与分子光谱学
  • 基金资助:
    重庆市教育委员会资助项目(KJ111210);重庆文理学院重点资助项目(Z2010HH12)

Resonance Scattering Spectral Method for Determination of Trace Ferrum (Ⅲ) with Acridine Red

SONG Zhongrong, ZOU Rong, HE Jiahong, XU Qiang*   

  1. (Chemistry and Environment Engineering College,Chongqing University of
    Arts and Sciences,Chongqing 402168,China)
  • Received:2011-06-28 Revised:2011-09-24 Published:2012-05-10 Online:2012-05-10
  • Contact: SONG

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被引次数

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摘要： 在pH=3.2的HCl介质中，Fe(Ⅲ)氧化I-产生I2，I2与过量I-形成I-3，I-3与吖啶红(AR)通过静电引力缔合形成AR-I3离子缔合物(结合比为n(I-3)∶n(AR)=1∶1)，AR-I3分子自动聚集形成(AR-I3)n缔合物微粒，从而引起共振散射光谱显著增强，其最大散射峰位于468 nm。 实验研究了介质条件、共振探针用量等因素对散射体系的影响，考察了该散射反应稳定性及共存物质的影响，并对反应机理和散射光谱增强的原因进行了探讨。 结果表明，Fe(Ⅲ)与共振光散射强度增强值ΔI468 nm在0.08～0.56 mg/L范围内呈现良好线性关系，检测限为5.76×10-7 g/L。 该方法有较好的选择性，可用于水样中痕量Fe(Ⅲ)的测定，结果与原子吸收法一致，回收率为96.0%～102.4%，相对标准偏差小于3.3%。

关键词: 吖啶红, 共振散射, 缔合物颗粒, Fe(Ⅲ)

Abstract: In hydrochloric acid solution of pH=3.2, ferrum(Ⅲ) can oxidize I- into the form of I-3 and acridine red(AR) can react with I-3 to form of AR-I3 ion association complexes(the composition stoichiometry was defined as n(I-3)∶n(AR)=1∶1). The association complexes automatically aggregate to (AR-I3)n association particles. In this case, the resonance light scattering(RLS) intensities are enhanced greatly. The maximum RLS wavelength locates at 468 nm. The optimum conditions of the reaction, influence factors and the effect of coexisting substances were investigated. In addition, the reaction mechanism of the ion-association complex was discussed. The resonance scattering intensity(ΔI468 nm) was linearly related to the concentration of ferrum(Ⅲ) in the range of 0.08～0.56 mg/L with a detection limit of 5.76×10-7 g/L. The assay was applied to the detection of trace ferrum(Ⅲ) in realistic samples, with a RSD of 3.3% and the recovery range of 96.0%～102.4%, and the results were in a good agreement with that of atomic absorption spectrometry assay.

Key words: acridine red, resonance light scattering, association particle, Ferrum(Ⅲ)

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