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Spectrophotometric Determination of Calcium in Tea and Table Salt Samples with DBS-Arsenazo

Hui Yu

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Abstract

Calcium() reacts with DBS-arsenazo to produce a 1:2 (M:R) blue complex in NH_3-NH_4Cl buffer solution medium at pH 11.0. The maximum absorption wavelength of the complex locates at 610 nm. The apparent molar absorptivity of the method is e_(max) = 1.2010~4 Lmol~(-1) cm~(-1). Beer's law is followed over the range of 0~25μ of calcium in 25 mL of solution. The method was used in the determination of calcium in tea and table salt samples. The results obtained are satisfactory.

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What this paper is about

Calcium() reacts with DBS-arsenazo to produce a 1:2 (M:R) blue complex in NH_3-NH_4Cl buffer solution medium at pH 11.0. The maximum absorption wavelength of the complex locates at 610 nm. The apparent molar absorptivity of the method is e_(max) = 1.2010~4 Lmol~(-1) cm~(-1). Beer's law is followed over the range of 0~25μ of calcium in 25 mL of solution. The method was used in the determination of calcium in tea and table salt samples. The results obtained are satisfactory.

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Available abstract

Calcium() reacts with DBS-arsenazo to produce a 1:2 (M:R) blue complex in NH_3-NH_4Cl buffer solution medium at pH 11.0. The maximum absorption wavelength of the complex locates at 610 nm. The apparent molar absorptivity of the method is e_(max) = 1.2010~4 Lmol~(-1) cm~(-1). Beer's law is followed over the range of 0~25μ of calcium in 25 mL of solution. The method was used in the determination of calcium in tea and table salt samples. The results obtained are satisfactory.

Key concepts: Molar absorptivity, Salt (chemistry), Calcium, Chemistry, Buffer solution, Absorption (acoustics), Molar ratio, Spectrophotometry

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