Dissolved Organic Sulfur in Seawater: Determination and Biogeochemical Cycling

海水中溶解的有机硫（DOS）化合物的光解是辐射重要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，因此可能涉及微量金属络合。然而，目前还没有合适的方法来检测海水中的DOS。因此，本工作的总体目标是采用现有的还原热解法（在氢气气氛中燃烧生成硫化氢，然后气相色谱-火焰光度法检测）来测定海水中的DOS，并将其应用于DOS循环的初步研究。该项目的具体目标是：(1)评价该方法的准确度、精密度、检出限和线性度；(2)实地检验方法，制定相应的样品保存程序；(3)获取河口、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。最后一个目标的工作将与羰基硫化物、DOC和DON以及痕量金属络合的其他研究结合起来，以便对DOS生物化学提出具体的假设。

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.