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Spectrophotometric Determination of Zinc in Zn(II)-5-Br-PADAP-CPB System

Yanbing Wang

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Abstract

The optimum conditions of the Zn(Ⅱ)-5-Br-PADAP-CPB system were studied by spectrophotometry.A stable orange complex of zinc(Ⅱ) with 2-[(5-bromo-2-pyridyl)-azo]-5-diethyl-aminophenol(5-BrPADAP) is formed in NaAc-HAc(pH=5.60) buffer solution containing cetylpyridinium bromide(CPB).The experimental results show that the maximum absorption of complex is at 557 nm and its apparent molar absorption coefficient is 1.14×105L.mol-1.cm-1.The Beer's law is obeyed in the concentration range of 0~0.56 mg/L for zinc(Ⅱ).The proposed method has been applied to the determination of zinc in the Zinc(Ⅱ) Complex of Polyphenol with satisfactory result after masking agents was added into the Zinc(Ⅱ) Complex solution.

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The optimum conditions of the Zn(Ⅱ)-5-Br-PADAP-CPB system were studied by spectrophotometry.A stable orange complex of zinc(Ⅱ) with 2-[(5-bromo-2-pyridyl)-azo]-5-diethyl-aminophenol(5-BrPADAP) is formed in NaAc-HAc(pH=5.60) buffer solution containing cetylpyridinium bromide(CPB).The experimental results show that the maximum absorption of complex is at 557 nm and its apparent molar absorption coefficient is 1.14×105L.mol-1.cm-1.The Beer's law is obeyed in the concentration range of 0~0.56 mg/L for zinc(Ⅱ).The proposed method has been applied to the determination of zinc in the Zinc(Ⅱ) Complex of Polyphenol with satisfactory result after masking agents was added into the Zinc(Ⅱ) Complex solution.

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Available abstract

The optimum conditions of the Zn(Ⅱ)-5-Br-PADAP-CPB system were studied by spectrophotometry.A stable orange complex of zinc(Ⅱ) with 2-[(5-bromo-2-pyridyl)-azo]-5-diethyl-aminophenol(5-BrPADAP) is formed in NaAc-HAc(pH=5.60) buffer solution containing cetylpyridinium bromide(CPB).The experimental results show that the maximum absorption of complex is at 557 nm and its apparent molar absorption coefficient is 1.14×105L.mol-1.cm-1.The Beer's law is obeyed in the concentration range of 0~0.56 mg/L for zinc(Ⅱ).The proposed method has been applied to the determination of zinc in the Zinc(Ⅱ) Complex of Polyphenol with satisfactory result after masking agents was added into the Zinc(Ⅱ) Complex solution.

Key concepts: Zinc, Spectrophotometry, Chemistry, Xylenol orange, Masking agent, Buffer solution, Molar absorptivity, Bromide

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