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Fading Spectrophotometric Determination of Trace Mercury with Hg~(2+)-Iodide-Safranine T Complex System

Yongmei Li

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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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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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Available 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.

Key concepts: Mercury (programming language), Fading, Detection limit, Chemistry, Iodide, Analytical Chemistry (journal), Spectrophotometry, Linear range

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