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2003•Physical Testing and Chemical AnalysisRequires access

PHOTOMETRIC DETERMINATION OF ALUMINUM IN WATER SAMPLES

Junjie He

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Abstract

In an HOAc-NaOAc buffer solution of pH 4. 7, aluminum(Ⅲ) reacts with p-acetylarsenazo (ASA-pA) to form a complex of mole ratio M : R= 1 : 2. The absorption maxima of this complex lies at the wavelength of 612nm, while the absorption maxima of the reagent at the wavelength of 542nm, giving a Δλ of 70nm The molar absorptivity of the colored complex was found to be 8. 19×103L · mol-1·cm-1. Beer's law holds in the range of 0 -2. 8μg of Al(Ⅲ) per ml of solution. This method has been applied satisfactorily to the determination of aluminum in water.

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What this paper is about

In an HOAc-NaOAc buffer solution of pH 4. 7, aluminum(Ⅲ) reacts with p-acetylarsenazo (ASA-pA) to form a complex of mole ratio M : R= 1 : 2. The absorption maxima of this complex lies at the wavelength of 612nm, while the absorption maxima of the reagent at the wavelength of 542nm, giving a Δλ of 70nm The molar absorptivity of the colored complex was found to be 8. 19×103L · mol-1·cm-1. Beer's law holds in the range of 0 -2. 8μg of Al(Ⅲ) per ml of solution. This method has been applied satisfactorily to the determination of aluminum in water.

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Available abstract

In an HOAc-NaOAc buffer solution of pH 4. 7, aluminum(Ⅲ) reacts with p-acetylarsenazo (ASA-pA) to form a complex of mole ratio M : R= 1 : 2. The absorption maxima of this complex lies at the wavelength of 612nm, while the absorption maxima of the reagent at the wavelength of 542nm, giving a Δλ of 70nm The molar absorptivity of the colored complex was found to be 8. 19×103L · mol-1·cm-1. Beer's law holds in the range of 0 -2. 8μg of Al(Ⅲ) per ml of solution. This method has been applied satisfactorily to the determination of aluminum in water.

Key concepts: Molar absorptivity, Reagent, Wavelength, Absorption (acoustics), Aluminium, Chemistry, Analytical Chemistry (journal), Buffer solution

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PHOTOMETRIC DETERMINATION OF ALUMINUM IN WATER SAMPLES — Research Paper | ScholarLens