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PHOTOMETRIC DETERMINATION OF MICROAMOUNTS OF IODATE BY COLOR-FADING REACTION OF DIMETHYL YELLOW

Feng Shang-cai

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Abstract

In a 0.1mol·L~(-1) H_2SO_4 medium, and in the presence of 0.05mol·L~(-1) of KBr, dimethyl yellow (DMY) is oxidized by iodate, leading to a color fading of DMY, and the decrease of color intensity (ΔA, measured at 515nm) keeps a linear relationship with the concentration of IO~-_3 ion (expressed as I_2) in the range from 0 to 20μg per 10ml of solution. The apparent molar absorptivity is 3.1×10~4L·mol~(-1)·cm~(-1), and the detection limit is 1.02×10~(-8)g·ml~(-1). This method is characterized by its sensitivity, selectivity, simplicity and rapidity. It has been applied satisfactorily to the determination of iodate in table salt.

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What this paper is about

In a 0.1mol·L~(-1) H_2SO_4 medium, and in the presence of 0.05mol·L~(-1) of KBr, dimethyl yellow (DMY) is oxidized by iodate, leading to a color fading of DMY, and the decrease of color intensity (ΔA, measured at 515nm) keeps a linear relationship with the concentration of IO~-_3 ion (expressed as I_2) in the range from 0 to 20μg per 10ml of solution. The apparent molar absorptivity is 3.1×10~4L·mol~(-1)·cm~(-1), and the detection limit is 1.02×10~(-8)g·ml~(-1). This method is characterized by its sensitivity, selectivity, simplicity and rapidity. It has been applied satisfactorily to the determination of iodate in table salt.

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Available abstract

In a 0.1mol·L~(-1) H_2SO_4 medium, and in the presence of 0.05mol·L~(-1) of KBr, dimethyl yellow (DMY) is oxidized by iodate, leading to a color fading of DMY, and the decrease of color intensity (ΔA, measured at 515nm) keeps a linear relationship with the concentration of IO~-_3 ion (expressed as I_2) in the range from 0 to 20μg per 10ml of solution. The apparent molar absorptivity is 3.1×10~4L·mol~(-1)·cm~(-1), and the detection limit is 1.02×10~(-8)g·ml~(-1). This method is characterized by its sensitivity, selectivity, simplicity and rapidity. It has been applied satisfactorily to the determination of iodate in table salt.

Key concepts: Iodate, Molar absorptivity, Chemistry, Fading, Detection limit, Analytical Chemistry (journal), Selectivity, Linear relationship

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PHOTOMETRIC DETERMINATION OF MICROAMOUNTS OF IODATE BY COLOR-FADING REACTION OF DIMETHYL YELLOW — Research Paper | ScholarLens