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地球学报  2008 

沉积岩总有机质碳同位素分析的前处理影响

DOI: 10.3975/cagsb.2008.06.03

Keywords: 沉积岩,有机碳同位素,样品前处理,条件试验

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Abstract:

岩石样品中的有机质稳定碳同位素地球化学已经在重建古环境和古植被等领域得到十分广泛的应用。但对样品的前处理方法的系统研究较少。由于岩石样品前处理的方法不同而对有机碳同位素的测量结果所产生的正负偏差,从而导致不能准确地反映样品中所记录的信息。笔者通过大量条件试验,分析了前处理过程中主要影响实验结果的几种因素。①样品粒度的影响:粒度100目的样品可得理想数据,而粒度在60目时两个样品同位素值均相对偏正,200目时灰岩样品也相对偏正;②不同酸浓度的影响:在1~12N浓度酸处理样品其有机质碳同位素没有明显变化,但低等级酸所含杂质明显使数据偏负,加入15%的氢氟酸对数据没有产生明显影响;③洗除样品中残余酸和烘干温度的影响:为了避免样品中有机质的损失,而不洗除样品中残余的酸,但是样品数据明显偏负并对仪器有损坏,烘干温度100°C时样品部分有机质挥发或升华而使数据相对偏正。

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