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Harvesting a crop of gold in plants

机译:在植物中收获黄金

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The possibility of turning base metals into gold has intrigued many scientists since the early alchemists, and the discovery of significant gold uptake by plants has long been a 'philosopher's stone'. But background levels of gold in plants are usually very low, rarely exceeding 10 ng per g dry tissue (10 p.p.b.). Hyperaccumulator plants, however, have 100 times the elemental concentrations of normal vegetation, a level of 1 mg per g dry tissue (1 p.p.m.). They can be used in phytoremedia-tion, the in situ improvement of polluted sites. Hyperaccumulation can be induced by adding a chemical amendment, such as EDTA, to a plant substrate to make soluble an otherwise insoluble target metal, such as lead. Here we have induced plants to accumulate gold from ores by treating the substrate with ammonium thiocyanate. This technique might be Used as a form of biological mining (phytomining) for gold.
机译:自早期的炼金术士以来,将贱金属转化为金的可能性引起了很多科学家的兴趣,而植物大量吸收金的发现长期以来一直是“哲学家的石头”。但是植物中的金本底水平通常很低,很少超过每克干组织10 ng(10 p.p.b.)。但是,高蓄积植物的元素浓度是正常植被的100倍,每克干组织(下午1点)的水平为1毫克。它们可用于植物修复,即污染部位的原位改良。可以通过向植物基质中添加化学修饰剂(例如EDTA)来诱导过度积累,从而使原本不溶的目标金属(如铅)变得可溶。在这里,我们通过用硫氰酸铵处理基质,诱导植物从矿石中积累金。该技术可以用作金的生物开采(phytomining)形式。

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