微波程序消解—加标浓度直读法测定芝麻、花生、核桃中的钙

为建立一种快速简便、准确测定食品中钙的新方法,选用坚果为样品,微波程序消解后,采用离子选择性电极加标浓度直读法测定钙含量。结果表明:钙电极的转换系数为98.61%,相对标准偏差均小于4%。该法测定简便快速、读数直观、成本低廉、样品用量少,为食品中钙的测定提供了一种全新的分析技术,有较强的创新性和推广应用价值。

Determination of calcium in sesame seeds, peanuts and walnuts by microwave digestion with standard addition direct reading method

A new, rapid, simple, accurate analysis method to detect calcium in foods was established. Some oily nuts were selected as samples, dissolved by microwave, and detected by ion selective electrode and standard concentration direct reading method. The results indicated that the conversion coefficient of calcium electrode was 98.61% and the relative standard deviation was less than 4%. The method is rapid, simple, direct reading, low cost and less sample consumption. It provides a new analytical technique for the determination of calcium in foods. The method has a strong creative and application value.