Total mercury, monomethylmercury, and total carbon in sediments from the Southern Ocean and South Sandwich Trench during the PS133/1 expedition (3 – 9 November 2022)

Sediment cores for total mercury (Hg), monomethylmercury (MMHg), and total carbon (TC) were collected in the Southern Ocean and the South Sandwich Trench between 3 and 9 November 2022 during the PS133/1 expedition. Sampling depths ranged from approximately 3700 to 8000 m, using a multicorer (MUC) system. Total Hg concentrations were determined by thermal decomposition, amalgamation, and atomic absorption spectrophotometry (TDA–AAS) using a DMA-80 Direct Mercury Analyzer (Milestone). Monomethylmercury (MMHg) was analyzed by gas chromatography–cold vapor atomic fluorescence spectrometry (GC–CVAFS) following ethylation with sodium tetraethylborate on a KOH-digested aliquot, using a Brooks Rand manual system. Total carbon (TC) was measured using an elemental analyzer Euro EA 3000 (HEKAtech GmbH).

2022年11月3日至9日，在PS133/1科考航次期间，科研人员于南大洋及南桑威奇海沟采集了用于检测总汞（total mercury, Hg）、甲基汞（monomethylmercury, MMHg）与总碳（total carbon, TC）的沉积物岩芯。采样水深范围约为3700至8000米，采用多管采样器（multicorer, MUC）系统完成采样。总汞浓度通过热分解-汞齐化-原子吸收分光光度法（thermal decomposition, amalgamation, and atomic absorption spectrophotometry, TDA-AAS）测定，所用仪器为DMA-80直接测汞仪（Milestone）。甲基汞的分析流程为先对经氢氧化钾（KOH）消解的分样进行四乙基硼酸钠乙基化衍生，随后采用气相色谱-冷蒸气原子荧光光谱法（gas chromatography–cold vapor atomic fluorescence spectrometry, GC-CVAFS），并依托Brooks Rand手动分析系统完成检测。总碳的含量通过元素分析仪Euro EA 3000（HEKAtech GmbH）进行测定。