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2004•Chinese Journal of Spectroscopy LaboratoryRequires access

Spectrophotometric Determination of Calcium in Water Samples with DBC-Arsenazo

Wei Wang

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Abstract

In the H 3BO 3-H 3PO 4-HAc buffer solution medium at pH 10.9,calcium(Ⅱ) reacts with DBC-arsenazo to produce a 1∶2(M∶R) blue complex.The maximum absorption wavelength of the complex is at 620nm and the apparent molar absorptivity of the method is e max =1.86×10 4L·mol -1 ·cm -1 .Beer's law is obeyed in the concentration range of 0-1.4μg/mL of calcium.The method has been applied to the determination of calcium in water samples with satisfactory results.

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What this paper is about

In the H 3BO 3-H 3PO 4-HAc buffer solution medium at pH 10.9,calcium(Ⅱ) reacts with DBC-arsenazo to produce a 1∶2(M∶R) blue complex.The maximum absorption wavelength of the complex is at 620nm and the apparent molar absorptivity of the method is e max =1.86×10 4L·mol -1 ·cm -1 .Beer's law is obeyed in the concentration range of 0-1.4μg/mL of calcium.The method has been applied to the determination of calcium in water samples with satisfactory results.

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Available abstract

In the H 3BO 3-H 3PO 4-HAc buffer solution medium at pH 10.9,calcium(Ⅱ) reacts with DBC-arsenazo to produce a 1∶2(M∶R) blue complex.The maximum absorption wavelength of the complex is at 620nm and the apparent molar absorptivity of the method is e max =1.86×10 4L·mol -1 ·cm -1 .Beer's law is obeyed in the concentration range of 0-1.4μg/mL of calcium.The method has been applied to the determination of calcium in water samples with satisfactory results.

Key concepts: Molar absorptivity, Chemistry, Calcium, dBc, Spectrophotometry, Buffer solution, Absorption (acoustics), Analytical Chemistry (journal)

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