The cultivated rheum required quantity has an increase for the fe, mn, co, and decrease for the zn, cu, ni element nutrition with the growth age changes.

随著生长年龄增加种植大黄对铁、锰、钴元素营养需求量有所增加，对锌、铜、镍元素营养的需求量略减。

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A method for the analysis of an, ag, Zn, Cu, Ni, Co and fe in ion-exchange resins at the different stages of technological processes of leaching Au using ion-exchange technology was developed.

本工作对离子交换法提取金的工艺生产过程不同阶段离子交换树脂中的金及其它元素银、锌、铜、镍、钻和铁的分析进行了研究。

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The proportions of exchangeable Zn, Cd, Co and Ni in the inner bay were higher than in the outer bay, indicating the impacts of pollutant input along the bank.

湾内沉积物中锌、镉、钴和镍的可交换态比例明显高于湾外，体现了沿岸污染径流输入的影响。

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