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Determination of trace amount of germanium by spectrophotometry with T(DBNP)P

Weixing Ma

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Abstract

The coloring reaction of the reagent meso-tetra-(3,5-dibromo-4-hydroxydroxyphenyl) porphyrin with Ge(Ⅳ) in the presence of Tween-80 were studied. Results show that the colour reagent reacts with Ge(Ⅳ) to form a stable green complex (1∶1) in the presence of Na_2SO_3 solution at pH 9.50. The maximum absorption wavelength and apparent molar absorptivity are 418 nm and 1.76×10~5 L·mol~(-1)·cm~(-1), respectively. Beer′s law is obeyed in the range of 0～0.45 μg/mL Ge(Ⅳ). The method has been applied to the determination of micro germanium(Ⅳ) in tea and lycium.

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The coloring reaction of the reagent meso-tetra-(3,5-dibromo-4-hydroxydroxyphenyl) porphyrin with Ge(Ⅳ) in the presence of Tween-80 were studied. Results show that the colour reagent reacts with Ge(Ⅳ) to form a stable green complex (1∶1) in the presence of Na_2SO_3 solution at pH 9.50. The maximum absorption wavelength and apparent molar absorptivity are 418 nm and 1.76×10~5 L·mol~(-1)·cm~(-1), respectively. Beer′s law is obeyed in the range of 0～0.45 μg/mL Ge(Ⅳ). The method has been applied to the determination of micro germanium(Ⅳ) in tea and lycium.

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Available abstract

The coloring reaction of the reagent meso-tetra-(3,5-dibromo-4-hydroxydroxyphenyl) porphyrin with Ge(Ⅳ) in the presence of Tween-80 were studied. Results show that the colour reagent reacts with Ge(Ⅳ) to form a stable green complex (1∶1) in the presence of Na_2SO_3 solution at pH 9.50. The maximum absorption wavelength and apparent molar absorptivity are 418 nm and 1.76×10~5 L·mol~(-1)·cm~(-1), respectively. Beer′s law is obeyed in the range of 0～0.45 μg/mL Ge(Ⅳ). The method has been applied to the determination of micro germanium(Ⅳ) in tea and lycium.

Key concepts: Molar absorptivity, Chemistry, Reagent, Germanium, Spectrophotometry, Porphyrin, Color reaction, Absorption (acoustics)

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