Sulphate reduction rates of arctic deep sea sediments measured at station MSM16/2_809-1 (REF, Reference)

Turnover rates were determined for surface sediment cores obtained in 2009 and 2010. Sulfate reduction (SR) were measured ex situ by the whole core injection method (doi:10.1080/01490457809377722). We incubated the samples at in situ temperature (1.0°C) for 12 hours with carrier-free 35**SO4 (dissolved in water, 50 kBq). Sediment was fixed in 20 ml 20% ZnAc solution for AOM or SR, respectively. Turnover rates were measured as previously described (doi:10.4319/lom.2004.2.171).

本研究针对2009年与2010年采集的表层沉积物岩芯（surface sediment cores）测定了其周转速率。硫酸盐还原作用（Sulfate reduction, SR）采用岩芯全样注入法进行异位测定，相关方法参考文献DOI：10.1080/01490457809377722。实验将样品置于原位温度（1.0℃）下，与溶于水的无载体35S标记硫酸盐（carrier-free 35SO4，50 kBq）共同孵育12小时。随后分别使用20 mL 20%乙酸锌（ZnAc）溶液固定沉积物，以分别用于厌氧甲烷氧化（Anaerobic Oxidation of Methane, AOM）与硫酸盐还原作用的相关检测。周转速率的测定方法参照已发表文献，参考文献DOI：10.4319/lom.2004.2.171。