Planktonic foraminifera, stable isotope record and temperature reconstruction of sediment core MD95-2040

Stable isotope measurements were generally made on 30 specimens of the planktonic foraminifera species Globigerina bulloides picked from the 250-355 µm size fraction. Before analysis, the forams were treated with a 3 % solution of hydrogen peroxide to remove traces of organic contaminants, crushed and cleaned using an ultrasonic generator, rinsed in acetone and oven dried at 50°C. Depending on the sample size, they were analysed using different mass spectrometers and preparation systems. The larger samples were reacted with 100 % orthophosphoric acid at 90oC using a VG Isotech Isocarb common acid bath system, and the carbon dioxide produced during this reaction was then analysed by a VG Isotech SIRA - Series II mass spectrometer. For the smaller samples (less than100 micrograms) analyses were performed using a PRISM mass spectrometer with a Micromass Multicarb sample preparation system. […]

稳定同位素测量通常针对从250-355微米尺寸分级中选取的30个浮游有孔虫物种Globigerina bulloides样本进行。在分析之前，这些有孔虫样本经过3%过氧化氢溶液处理以去除有机杂质的痕迹，并使用超声波发生器进行粉碎和清洗。随后，样本用丙酮冲洗，并在50°C下进行烘干。根据样本的大小，它们被用不同的质谱仪和制备系统进行分析。较大的样本在90°C下与100%正磷酸反应，使用VG Isotech Isocarb通用酸浴系统，期间产生的二氧化碳随后通过VG Isotech SIRA系列II质谱仪进行分析。对于较小的样本（小于100微克），分析是通过PRISM质谱仪和Micromass Multicarb样本制备系统进行的。