Quicklime samples were collected from six vertical layers (L1–L6) of a feedstock calcined in a traditional single-batch wood-fired kiln and assessed. Three samples were well-burned and three under-burned. The quicklime was slaked in an excess of water and the presence of unburned particles was investigated after settling it into putty. The putty was assessed as bulk and also at three depth levels. Thermal analysis determined the CO2 residua in the quicklime samples. Cathodoluminescence detected individual unburned particles and image analysis was used for their quantification. Settling of the putties led to a considerable reduction of geogenic particles in the layers above the bottom. This was also confirmed by the stable isotope analysis. In the case of the putties made from well-burned quicklime, the δ13C values of samples L4 and L5 ranged from –25.5‰ to –20.5‰ VPDB, and the δ18O values ranged from –17.5‰ to –16.5‰ VPDB. The fractionation was likely affected by the division according to the particle size during the sedimentation. The results of the 14C analysis correlate with the quantified percentage of cathodoluminescent particles.

中文翻译：

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与放射性碳测年有关的砂浆中残余地源碳的评估


从在传统单批次燃木窑中煅烧的原料的六个垂直层 (L1–L6) 中收集生石灰样品并进行评估。三个样品燃烧良好，三个样品燃烧不足。将生石灰在过量的水中熟化，并在将其沉降到腻子中后检查未燃烧颗粒的存在。腻子被评估为块状且具有三个深度水平。热分析测定了生石灰样品中的 CO2 残留量。阴极发光检测单个未燃烧的颗粒，并使用图像分析对其进行量化。油灰的沉降导致底部以上各层中的地质颗粒大量减少。稳定同位素分析也证实了这一点。对于由充分燃烧的生石灰制成的腻子，样品 L4 和 L5 的 δ13C 值在 –25.5‰ 至 –20.5‰ VPDB 范围内，δ18O 值在 –17.5‰ 至 –16.5‰ VPDB 范围内。分级可能受到沉降过程中根据粒径划分的影响。 14C 分析的结果与阴极发光颗粒的定量百分比相关。