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Spectrophotometric determination of calcium with tribromoarsenazo

Qing-Zhou Zhai

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Abstract

In NH_3·H_2O-NH_4Cl buffer medium at pH 10.0,calcium(Ⅱ) can form a blue complex with the composition of 1∶2(M∶R) with tribromoarsenazo.The maximum absorption wavelengh locates at 610 nm.The apparent molar absorptivity is e_(610 nm)=7.16×10~4 (L·mol~(-1)·cm~(-1).)Beer's law is obeyed in the range of 0-25 μg/25 mL for calcium.The method has been applied to the determination of calcium in rain water and sodium sulfate with satisfactory results.The present method is simple,rapid and accurate.

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What this paper is about

In NH_3·H_2O-NH_4Cl buffer medium at pH 10.0,calcium(Ⅱ) can form a blue complex with the composition of 1∶2(M∶R) with tribromoarsenazo.The maximum absorption wavelengh locates at 610 nm.The apparent molar absorptivity is e_(610 nm)=7.16×10~4 (L·mol~(-1)·cm~(-1).)Beer's law is obeyed in the range of 0-25 μg/25 mL for calcium.The method has been applied to the determination of calcium in rain water and sodium sulfate with satisfactory results.The present method is simple,rapid and accurate.

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Available abstract

In NH_3·H_2O-NH_4Cl buffer medium at pH 10.0,calcium(Ⅱ) can form a blue complex with the composition of 1∶2(M∶R) with tribromoarsenazo.The maximum absorption wavelengh locates at 610 nm.The apparent molar absorptivity is e_(610 nm)=7.16×10~4 (L·mol~(-1)·cm~(-1).)Beer's law is obeyed in the range of 0-25 μg/25 mL for calcium.The method has been applied to the determination of calcium in rain water and sodium sulfate with satisfactory results.The present method is simple,rapid and accurate.

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

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