Dissolved Organic Sulfur in Seawater: Determination and Biogeochemical Cycling

小行星9521628 海水中溶解的有机硫（DOS）化合物的光解是重要的辐射性气体羰基硫循环的主要来源，并且由于许多有机硫化合物是强配体，因此可能参与痕量金属络合。 然而，没有合适的手段来检测海水中的DOS。 因此，这项工作的总体目标是适应现有的还原热解方法测定海水中的DOS（在氢气气氛中燃烧硫化氢，然后气相色谱-火焰光度检测），并将其应用到DOS循环的初步研究。该项目的具体目标是：（1）评估方法的准确度、精密度、检测限和线性;（2）在现场测试该方法并开发适当的样品储存程序;（3）获得河口、沿海和公海沃茨的DOS数据，作为其地球化学行为的初步调查。 关于这最后一个目标的工作将与其他研究的硫化羰，DOC和DON，和微量金属络合，以允许制定具体的假设DOS生物化学。

9521628 Cutter The photolysis of dissolved organic sulfur (DOS) compounds in seawater is a principle source of the radiatively important gas carbonyl sulfur cycle and may be involved in trace metal complexation since many organic sulfur compounds are strong ligands. However, no suitable means for the detection of DOS in seawater exists. Therefore, the overall goal for this work is to adapt an existing reductive pyrolysis method for the determination of DOS in seawater (combustion in a hydrogen atmosphere to hydrogen sulfide and then gas chromatography-flame photometric detection) and to apply it to an initial study of DOS cycling. Specific objectives for this project are: (1) to evaluate the accuracy, precision, detection limits, and linearity of the method; (2) to test the method in the field and develop appropriate sample storage procedures; and (3) to obtain DOS data for estuarine, coastal, and open ocean waters as an initial survey of its biogeochemical behavior. Work on this last objective will be in conjunction with other studies of carbonyl sulfide, DOC and DON, and trace metal complexation in order to allow the formulation of specific hypotheses on DOS biochemistry.