不同叶龄桑叶中微量元素含量分析

Analysis of trace elements content in mulberry leaves of different age

桑叶作为桑茶和蚕饲料有着十分重要的价值。采用原子吸收光谱法对不同叶龄的桑叶中微量元素进行测定。结果表明,铁的含量随叶龄的变化不是很明显,最高含量为316.5 mg.kg-1,最低含量为291.0 mg.kg-1;新叶中铜含量相对老叶中要高,最高含量为12.32 mg.kg-1,最低含量为7.40 mg.kg-1;锰的含量变化没有明显的规律;镉、铅的含量随着叶龄越长呈明显的上升趋势,最高含量分别达到0.406 9和5.807 5 mg.kg-1;而锌随着叶龄的增长呈明显的下降趋势,最高含量为391.5 mg.kg-1,最低含量为268.3 mg.kg-1。

In this experiment, the atomic absorption spectrometry was used to detect the trace elements in different stages of mulberry leaves. The results indicated that the change of the iron content was not very obvious, the highest content was 316.5 mg·kg^-1 and the lowest content was 291.0 mg·kg^-1. The copper content in young leaves was higher compared with that in old leaves,and the highest content was 12.32 mg·kg^-1 ,while the lowest content was 7.40 mg·kg^-1. The content change of the manganese in the leaves with the growing leaf age was not in regularity. Cadmium,lead contents trended to raise with the growth of the leaf age, the highest content was 0. 406 9 and 5. 807 5 mg·kg^-1 ,respectively. The zinc content trended downward with the growth of the leaves, the highest content was 391.5 mg·kg^-1 and the lowest content was 268.3 mg·kg^-1.