IODP Expedition 341 Elemental analysis (CHNS)

Fundamental elemental component (total carbon, hydrogen, nitrogen, and sulfur) fluctuations help define the origin, depositional environment, and diagenetic alteration of source materials. To determine C, H, N, and S, solid samples are reacted with a catalyst, separated by chromatography, and detected by thermal conductivity on a FlashEA 1112 CHNS elemental analyzer. Organic carbon can be directly measured on the elemental analyzer by acidification of the sample to drive off carbonate as carbon dioxide before analyzing. Total organic carbon on this report is measured rather than calculated.基础元素组分（总碳、氢、氮及硫）的波动特征，可为物源的成因、沉积环境与成岩蚀变过程提供限定依据。为测定碳、氢、氮、硫元素含量，需将固体样品与催化剂反应，经色谱分离后通过热导检测器完成检测，所用仪器为FlashEA 1112型CHNS元素分析仪。分析前可通过对样品进行酸化处理，使碳酸盐以二氧化碳形式逸出，从而直接在该元素分析仪上测定有机碳含量。本报告中的总有机碳均为实测值，而非计算值。