Pore-water nutrients, cations and DIC for sediment core SO268/2_125-1 (MUC-25) at a disturbed site after a small-scale dredge experiment during RV SONNE cruise SO268/2 in the CCZ, Pacific Ocean@en

This dataset comprises downcore measurements of pore-water nutrients, cations and DIC for sediment cores (MUC) retrieved from disturbed sites after a small-scale dredge experiment in the framework of the European collaborative JPI Oceans MiningImpact project onboard R/V SONNE cruise SO268 in 2019. The scientific work during cruise SO268 was part of the second phase of the MiningImpact project (Environmental impacts and risks of deep-sea mining) and is designed to assess the environmental impacts of deep-sea mining of polymetallic nodules in the Clarion-Clipperton Zone (CCZ) in the Pacific Ocean. The pore water was extracted onboard by rhizon sampling. Pore-water nutrient concentrations (nitrate, nitrite, ammonium, silicic acid, phosphate) were analyzed onboard on freshly extracted pore water upon 3-fold dilution or undiluted (ammonium) using a QuAAtro continous segmented flow analyzer (Seal Analytical). Major and minor elements were determined on acidified samples (25 µL double sub-boiling distilled concentrated HCl per 1 mL sample) using ICP-AES (iCAP 7400, Thermo Scientific) and DIC was determined on HgCl2-treated pore-water samples using a QuAAtro continous segmented flow analyzer (Seal Analytical) at the Marine Geochemistry Lab, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven.本数据集包含2019年搭载于松恩号（R/V SONNE）科考船SO268航次、在欧洲联合JPI Oceans采矿影响（JPI Oceans MiningImpact）项目框架下开展的小规模疏浚实验后，取自受扰动海域站位的沉积物岩芯（MUC）的岩芯剖面孔隙水营养盐、阳离子及溶解无机碳（Dissolved Inorganic Carbon, DIC）测量数据。本航次期间的科研工作属于MiningImpact项目第二阶段——深海采矿的环境影响与风险，旨在评估太平洋克拉里昂-克利珀顿区（Clarion-Clipperton Zone, CCZ）多金属结核深海采矿的环境影响。孔隙水于航次现场通过Rhizon采样装置采集。孔隙水营养盐（硝酸盐、亚硝酸盐、铵盐、硅酸、磷酸盐）浓度在航次现场对新鲜采集的孔隙水进行分析：除铵盐采用未稀释样品外，其余指标均经3倍稀释后，使用QuAAtro连续流动分析仪（Seal Analytical公司）完成检测。常量与微量元素通过酸化后的样品（每1mL样品加入25微升二次亚沸蒸馏浓盐酸）测定，采用电感耦合等离子体原子发射光谱（Inductively Coupled Plasma Atomic Emission Spectroscopy, ICP-AES，赛默飞世尔科技iCAP 7400型）；溶解无机碳（DIC）则在不来梅港阿尔弗雷德·魏格纳研究所-亥姆霍兹极地与海洋研究中心海洋地球化学实验室，对经氯化汞处理的孔隙水样品，使用QuAAtro连续流动分析仪（Seal Analytical公司）完成测定。