引用本文:
刘汉芳. 对乙酰基偶氮胂光度法测定粮食中的钙[J]. 应用化学,
1987, 4(1): 75-76.
Citation: Liu Hanfang. SPECTROPHOTOMETRIC DETERMINATION OF CALCIUM IN GRAIN WITH p-ACETYL-ARSENAZO[J]. Chinese Journal of Applied Chemistry, 1987, 4(1): 75-76.
Citation: Liu Hanfang. SPECTROPHOTOMETRIC DETERMINATION OF CALCIUM IN GRAIN WITH p-ACETYL-ARSENAZO[J]. Chinese Journal of Applied Chemistry, 1987, 4(1): 75-76.
对乙酰基偶氮胂光度法测定粮食中的钙
摘要:
粮食中钙的测定一般采用EDTA滴定法和原子吸收法[1]。前者难应用于微量分析,后者则需要贵重的仪器。变色酸双偶氮衍生物光度法可以克服二者的缺点。这方面的研究已见报导[2,3]。但仍有一些干扰离子的问题须待解决。
English
SPECTROPHOTOMETRIC DETERMINATION OF CALCIUM IN GRAIN WITH p-ACETYL-ARSENAZO
Abstract:
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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