Dissolved Organic Sulfur in Seawater: Determination and Biogeochemical Cycling

9521628 Cutter溶解有机硫化合物在海水中的光解是辐射重要的气体羰基硫循环的主要来源，并可能参与痕量金属络合，因为许多有机硫化合物是强配体。然而，目前还没有合适的方法来检测海水中的DOS。因此，这项工作的总体目标是将现有的还原热解方法应用于海水中DOS的测定(在氢气气氛中燃烧成硫化氢，然后用气相色谱-火焰光度检测)，并将其应用于DOS循环的初步研究。该项目的具体目标是：(1)评估该方法的准确度、精密度、检测下限和线性；(2)在现场测试该方法并制定适当的样品存储程序；(3)获得河口、沿海和开阔海域的DOS数据，作为其生物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对羰基硫化物、DOC和DON以及微量金属络合的其他研究相结合，以便能够提出关于DOS生物化学的具体假设。

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.