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Citation: Liu Hanfang. SPECTROPHOTOMETRIC DETERMINATION OF CALCIUM IN GRAIN WITH p-ACETYL-ARSENAZO[J]. Chinese Journal of Applied Chemistry, ;1987, 4(1): 75-76. shu

SPECTROPHOTOMETRIC DETERMINATION OF CALCIUM IN GRAIN WITH p-ACETYL-ARSENAZO

Liu Hanfang

1.
Shandong Agricultural University

Received Date: 13 December 1985
Available Online: 26 May 1986

P-Acelyl-arsenazo reacts with calcium cation at pH=12.9, forming a dark-blue complex with maximum absorption at 640 nm. The molar extinction coefficient of the complex is 1.1×10⁴. The relationship between the absorption and the concentration of the solution obeys the Beer's law, provided that Ca²⁺ has the concentrations within 5-50 μg/25ml.The interference of Fe³⁺ and Cu²⁺ can be eliminated by adding F^- and triethanolamine, respectively. The recovery of Ca²⁺ added into the solutions of digested grains varys in the range of 95-110%.
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