火焰原子吸收光谱法测定黑花生中微量元素

Determination of Trace Elements in Black-Skinned Peanut by Flame Atomic Absorption Spectrometry

以硝酸和过氧化氢混合溶液为消解剂,建立了高压密闭消解-火焰原子吸收光谱法测定黑花生中6种微量元素的分析方法。加入三氯化镧和氯化铯消除钙、镁和钾的测定干扰,方法的相对标准偏差为0.30%—2.38%,回收率在95.0%—110.0%范围内。结果表明,黑花生中对人体健康有益的铜、铁、锌、钙、镁、钾等元素的含量均比较丰富,在花生包衣中铜、铁、钙、镁和钾的含量高于果仁,作为比较,本研究还对同一产地出产的另外两个花生品种进行分析。

The method for analysis of six trace elements（Cu,Fe,Zn,Ca,Mg and K）in black-skinned peanut was established by flame atomic absorption spectrometry combining with high-pressure closed-vessel digestion system and mixture solution of nitric acid as digestion solution.LaCl3 and CsCl were used as releasing agent to eliminate chemical interference to determination of calcium,magnesium and potassium,respectively.The relatively standard deviation was 0.30%—2.38%,and the recovery was from 95.0% to 110.0%.Some elements essential to human such as Cu,Fe,Zn,Ca,Mg and K in black-skinned peanut were relatively abundant.The contents of Cu,Fe,Ca,Mg and K in peanut skins were higher than that in kernels.The levels of six elements contents in black-skinned peanut were compared with that of other two local peanuts.