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Use of heavy liquid density separation to remove pyrite from sediment samples for radiocarbon dating

机译:使用重液密度分离从沉积物样品中去除黄铁矿以进行放射性碳测年

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摘要

Sample preparation protocols for concentrating organic material from sediments for radiocarbon dating often include a large number of steps and the use of hazardous chemicals. Thus, these protocols are often problematic for pollen-poor sediments as material can get lost or may become degraded. Pyrite in samples for radiocarbon dating hinders an effective graphitisation process and thus needs to be removed during sample preparation. Standard protocols require the use of nitric acid, a strong oxidant that corrodes organic material. Therefore, the use of nitric acid needs to be avoided when preparing pollen-poor but pyrite-rich sediments.
机译:从沉积物中浓缩有机物质以进行放射性碳测年的样品前处理方案通常包括大量步骤和使用危险化学品。因此,这些协议对于缺乏花粉的沉积物通常是有问题的,因为材料可能会丢失或降解。样品中用于放射性碳定年的黄铁矿阻碍了有效的石墨化过程,因此需要在样品制备过程中将其除去。标准协议要求使用硝酸,后者是一种强氧化剂,会腐蚀有机物质。因此,制备花粉少但富含黄铁矿的沉积物时,应避免使用硝酸。

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