钴 cobalt
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Co，原子量 58.9。对于某些植物来说，是必需的微量元素。钴是共生细菌和蓝藻类在固氮时所必需的维生素 B12 的组成成分（含量 6％），对具有茎叶的植物来说，也是必需的。在反刍类瘤胃中共生的微生物利用钴合成维生素 B12 ，但在澳大利亚等地，因土壤中缺乏该元素，所以通过口服来补充钴，以防家畜因缺乏 B12 出现贫血。
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