Stable hydrogen isotope record of C30-Alkanoic acid from sediment core MD98-2152 for 450 kyr

The stable hydrogen isotopes of C30-Alkanoic acids were measured from marine sediment core MD98-2152, collected off the southern coast of Sumatra, likely reflecting rainfall over southern Sumatra and western Java. The record extends to ~450,000 years before present and includes the five most recent glacial periods. To purify the leaf wax fatty acids for analysis, organic material was extracted from the sediment using an Accelerated Solvent Extractor, leaf waxes were isolated from each total lipid extract using column chromatography then methylated with methanol of a known isotopic composition to form fatty acid methyl esters, and purified with a final column. Hydrogen isotopes were measured using a gas chromatography-isotope ratio-monitoring mass spectrometer against Vienna Standard Mean Ocean Water (VSMOW). […]

对来自苏门答腊岛南部海岸的海洋沉积物核心MD98-2152中C30-烷酸稳定氢同位素进行了测量，该沉积物可能反映了苏门答腊岛南部和爪哇岛西部的降雨情况。该记录追溯至约450,000年前，并涵盖了最近的五个冰川时期。为分析叶蜡脂肪酸，采用加速溶剂萃取仪从沉积物中提取有机物质，然后通过柱层析技术从总脂质提取物中分离出叶蜡，并使用已知同位素组成的甲醇对其进行甲基化，以形成脂肪酸甲酯，最后通过最终柱层析进行纯化。利用气相色谱-同位素比率监测质谱仪测量氢同位素，以维也纳标准平均海洋水（VSMOW）为对照。