Flow-Injection Specrophotomemic Determination of Calcium Using PAN as a Color Agent

L. Jamil, S. A. Rahim
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Abstract

A spectrophotometric method for determination of Ca in aqueous solution using 1-(2-pyridylazo)-2-naphthol (PAN) as color reagent based on the formation of Ca-PAN Complex at pH 12 and measuring absorbance at 550nm, with molar absorptivity of 1.70×104 L.mol-1cm-1 has been modified to a flow injection-spectrophotometric (FI) method. The modified FI method is rapid, accurate, precise, and with low operation cost. The linear range of 1-8ppm was obtained with average recovery of 103.46 and precision of 1.5-3.4%. The proposed FI method using PAN as a color reagent was applied satisfactorily for the assay of Ca in natural water, milk, yogurt and human serum.
用聚丙烯腈作显色剂的流动注射分光光度法测定钙
以1-(2-吡啶偶氮)-2-萘酚(PAN)为显色剂,在pH值为12时形成Ca-PAN配合物,在550nm处测定吸光度,摩尔吸光度为1.70×104 L.mol-1cm-1,本文将其改进为流动注射-分光光度法(FI)。改进后的FI法快速、准确、精密度高,运行成本低。在1 ~ 8ppm的线性范围内,平均回收率为103.46,精密度为1.5 ~ 3.4%。本方法以PAN为显色剂,可用于天然水、牛奶、酸奶和人血清中钙的测定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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