不同产地及采摘期柴达木枸杞中无机元素含量分析

Element contents of Qaidam Chinese wolfberry from different habitats and harvesting time

【目的】测定不同产地、不同采摘期柴达木枸杞中的24种元素的含量,并对重金属含量进行评价.【方法】样品经微波消解后分别采用原子吸收分光光度法测定Pb和Cd的含量;原子荧光光谱法测定Hg和As的含量;ICP-OES法测定20种无机元素的含量,并选取K、Fe、Zn等9种主要元素,结合SPSS 19.0统计软件进行主成分分析.【结果】不同产地、不同采摘期柴达木枸杞中元素的种类相似,但含量存在一定差异.Fe、Cu、Mn和Zn的平均含量分别为49.80、2.55、5.84和4.80mg/kg.重金属Hg、Pb、Cu、Cd的含量都低于2015版《中华人民共和国药典》限量要求.主成分综合分析结果得出产于德令哈的枸杞较优.【结论】柴达木枸杞24种元素的含量与其生长环境、生长期、植物的生理活动有一定的关联性.

[Objective] To determine 24 inorganic elements in Qaidam Chinese wolfberry from different habitats and harvesting time, to evaluate heavy metals. [Method] Samples were dissolved by microwave. Content of Pb and Cd was determined by atomic absorption spectrophotometry; content of Hg and As was determined by atomic fluorescence spectrometry; Content of 20 elements were determined by inductively coupled plasma atomic emission spectrometry. Meanwhile, 9 primary elements were selected to the object of principal component analysis by SPSS 19. 0 software. [Result] There were similar types of elements,while there was a certain difference in the content of elements from different habitats and different harvesting time. The average content of Fe, Cu,Mn and Zn was 49.80,2. 55,5.84 and 4. 80 mg/kg, respectively. Con- tent of heavy metals （Pb, Cd, Hg, As, Cu） in all samples were lower than the 2015 edition of Chinese Phar- macopoeia Requirements. [Conclusion] Contents of 24 inorganic elements in Qaidam Chinese wolfberry from different habitats and harvesting time are closely related to their growing environment, growth stages and physical activities.