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LI Ren-yu, LI Yong-mei, WU Jun-jie, XIONG Qing. Fading Spectrophotometric Determination of Trace Mercury with Hg2+-Iodide-Safranine T Complex System[J]. Rock and Mineral Analysis, 2010, 29(4): 461-464.
Citation: LI Ren-yu, LI Yong-mei, WU Jun-jie, XIONG Qing. Fading Spectrophotometric Determination of Trace Mercury with Hg2+-Iodide-Safranine T Complex System[J]. Rock and Mineral Analysis, 2010, 29(4): 461-464.
shu

Fading Spectrophotometric Determination of Trace Mercury with Hg2+-Iodide-Safranine T Complex System

  • 1.

    Lanzhou Testing and Quality Supervision Center for Geological and Mineral Products, The Ministry of Land and Resources, Lanzhou 730053, China

  • 2.

    Jiangsu Province Marine Resources Research ＆ Development Institute, Huaihai Institute of Technology, Lianyungang 222005, China

  • 3.

    School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China

  • 4.

    Lianyungang Teachers College, Lianyungang 222006, China

  • 5.

    Lianyungang Teachers College, Lianyungang 222006, China

More Information
  • Received Date: September 01, 2009
  • Revised Date: January 18, 2010
    Abstract
  • A fading spectrophotometric method for the determination of trace mercury has been developed. In 0.01 mol/L H2SO4 medium, Hg2+ reacts with excess I- and safranine T(ST) to form a stable ion-association complex ( 2 ), which leads to the fading of ST. The maximum fading wavelength locates at 519 nm. The fading degree of the system is linear with the concentration of Hg2+ in the range of 0~1.35 μg/mL. Apparent molar absorption coefficient is 1.24×105 L/(mol·cm) with detection limit of 2.26 μg/L for mercury. Recoveries of Hg2+ are 98.3%~102.6% with precision of 1.2%~1.7% RSD (n=5). The method has been applied in the determination of trace mercury in river water samples after enrichment and separation with thiol cotton fiber.
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