食品科学

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盐酸浸提-电感耦合等离子体发射光谱法测定秋葵中Na、Mg、P、K、Ca含量

聂西度1,符 靓2,*   

  1. 1.湖南工学院材料与化学工程学院,湖南 衡阳 421002;2.长江师范学院化学化工学院,重庆 408100
  • 出版日期:2015-12-25 发布日期:2015-12-24
  • 通讯作者: 符 靓
  • 基金资助:

    国家自然科学基金面上项目(21271187);湖南省教育厅重点科研项目(14A035);
    湖南省重点学科建设项目(湘教发[2011]76号)

Determination of Macro Elements in Okra by Inductively Coupled Plasma Optical Emission Spectrometry with Hydrochloric Acid Extraction

NIE Xidu1, FU Liang2,*   

  1. 1. College of Material and Chemical Engineering, Hunan Institute of Technology, Hengyang 421002, China;
    2. College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
  • Online:2015-12-25 Published:2015-12-24
  • Contact: FU Liang

摘要:

建立电感耦合等离子体发射光谱法测定食用秋葵中Na、Mg、P、K、Ca元素的分析方法。食用秋葵样品经盐酸浸提后,采用电感耦合等离子体发射光谱法直接测定其中的Na、Mg、P、K、Ca 5 种常量元素,分析盐酸体积分数、浸提时间、浸提方式对样品中常量元素浸提率的影响,选用国家标准物质茶叶(GBW 08513)验证了方法的准确度和精密度。在选定的工作条件下,各元素标准曲线线性相关系数不小于0.999 3,线性关系良好,方法的检出限在3.88~12.26 μg/L之间,相对标准偏差在1.55%~3.91%之间。实际样品的分析结果表明,食用秋葵中含有丰富的常量元素,其中K含量最高,其次是P和Ca。该方法操作简单、结果准确,能满足食用秋葵中5 种常量元素的分析要求。

关键词: 食用秋葵, 盐酸浸提, 电感耦合等离子体发射光谱, 常量元素

Abstract:

An analytical method was developed for the determination of 5 macro elements including Na, Mg, P, K and Ca in
okra by inductively coupled plasma optical emission spectrometry (ICP-OES) with hydrochloric acid extraction. The effects
of different extraction conditions including HCl concentration, extraction method and extraction time on extraction efficiency
were investigated. The accuracy and precision of this method were confirmed by using the reference standard material tea
(GBW 08513). Under the optimum conditions, the standard curve of each element exhibited a good linear correlation with
a coefficient higher than 0.999 3. The detection limits for the 5 elements were in the range of 3.88–12.26 μg/L, with relative
standard deviations (RSDs) between 1.55% and 3.91%. A satisfactory result was obtained when the proposed method was
applied to analyze real samples. Okra contained abundant amounts of nutrient elements, with K being the most predominant
element, followed by P and Ca. The method was simple and accurate, and could be used for the determination of the 5 macro
elements in okra.

Key words: okra, hydrochloric acid extraction, inductively coupled plasma optical emission spectrometry, macro elements

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