Clay-associated organic matter (OM) resistant to hydrogen peroxide (H_2O_2) treatment is presumed to have higher proportions of recalcitrant OM (Plante et al., 2004), some of which has been shown to be enriched in aliphatic compounds. The objectives of this study were to characterize clay-associated OM using thermal analysis techniques before and after hydrogen peroxide treatment and secondly, to characterize the molecular structure of the hydrophobic part (e.g. lipids) of this resistant OM pool to determine the impact of land use. Clay-sized fractions were isolated from a cultivation sequence located in southwest France consisting of continuous forest, and 7 and 35 years of corn cultivation after forest clearing. Fractions were analyzed by thermogravimetry and differential scanning calorimetry using a Netzsch STA 409 thermal analyzer. The lipidic parts of the fractions were also analyzed using preparative thermochemolysis with TMAH (Gobe et al., 2000; Grasset et al., 2002).
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机译：粘土相关的有机物质（OM）抵抗过氧化氢（H_2O_2）处理，以具有更高的氯普膦族OM（Plante等，2004），其中一些已被证明富含脂族化合物。本研究的目的是在过氧化氢治疗前后使用热分析技术来表征粘土相关OM，其特征在于，其特征是这种抗性OM池的疏水部分（例如脂质）的分子结构，以确定土地使用的影响。从位于法国西南部的培养序列中分离粘土尺寸的级分，包括连续森林，森林清除后7和35年的玉米栽培。通过使用NetZSCH STA 409热分析仪通过热重度和差示扫描量热法分析级分。使用用TMAH的制备型热化学溶解分析级分的脂质部分（Gobe等，2000; Grasset等，2002）。
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