FAAS法测定打瓜不同部位微量元素的含量

Determination of microelement in different parts of watermelon by flame atomic absorption spectrometry

采用微波消解和超声波技术处理打瓜样品,空气-乙炔火焰原子吸收光谱法测定打瓜不同部位中的钙、铜、锌、铁、钾、锰、镁和钠含量。此方法的各元素加标回收率均在95%～105%之间,平均回收率在96.2%～104.0%之间,10次测定的相对标准偏差为0.23%～2.98%,准确性好、精密度高。研究结果表明,在新鲜的打瓜外皮、内皮、瓤和干燥的瓜籽中,钾、钙和镁含量较高,其中Ca含量顺序为外皮>籽>内皮>瓤,Cu含量为籽>外皮>内皮>瓤,Zn含量为籽>外皮>瓤≥内皮,Fe含量为籽>外皮>瓤>内皮,K含量为籽>内皮>外皮>瓤,Mn含量为籽>外皮>瓤>内皮,Mg含量为籽>外皮>内皮>瓤,Na含量为籽>外皮>内皮>瓤,研究结果可为打瓜瓤、外皮和内皮的开发利用提供理论依据。

Microwave and ultrasonic wave techniques were used for disposing watermelon samples. The contents of Ca,Cu,Zn, Fe, K, Mn, Mg and Na in different parts of watermelon were determined by flame atomic absorption spectrometry. The recoveries for each element were within the range of 95% to 105% ,the average recoveries were 96.2% to 104.0%,and RSD of the method for 10 times determinations were 0.23% to 2.98%,the method was accuracy and precise. The results showed that the contents of potassium ,calcium and magnesium were high in rind,endodermis,pulp and dried seed. The order of the content of Ca was rind〉seed〉endodermis〉 pulp, Cu was seed 〉rind 〉endodermis 〉pulp,Zn was seed 〉rind 〉pulp i〉 endodermis, Fe was seed 〉rind 〉pulp 〉 endodermis, K was seed 〉endodermis 〉rind 〉pulp, Mn was seed 〉rind 〉pulp 〉endodermis, Mg was seed 〉rind 〉 endodermis 〉pulp,Na was seed 〉rind 〉endodermis 〉pulp. The results of watermelon could provide theoretical basis for developing and utilizing the melon.