海洋学报（中文版）
海洋學報（中文版）
해양학보（중문판）
ACTA OCEANOLOGICA SINICA
2014年
6期
50-57
,共8页
黄香利%朱茂旭%陈良进%李铁
黃香利%硃茂旭%陳良進%李鐵
황향리%주무욱%진량진%리철
海洋沉积物%生物有机硫%成岩有机硫%硫同位素%胶州湾
海洋沉積物%生物有機硫%成巖有機硫%硫同位素%膠州灣
해양침적물%생물유궤류%성암유궤류%류동위소%효주만
marine sediments%biogenic organic sulfur%diagenetic organic sulfur%sulfur isotopes%Jiaozhou Bay
有机硫是海洋沉积物中重要的硫形态,其中成岩有机硫对有机质保存和微量元素形态具有重要影响。利用化学提取及硫稳定同位素研究了胶州湾沉积物中碱可提取的腐殖酸硫(HA-S)、富里酸硫(FA-S)以及铬不可还原有机硫(non-CROS)的垂直分布、来源及形成机制。结果表明,non-CROS、HA-S以及FA-S的含量范围分别为19.1~52.6、3.35~7.82和27.3~38.6μmol/g,均处于其他许多近海沉积物中含量的低值区,且3者均为海洋生物有机硫和成岩有机硫的混合物。HA-S 和 non-CROS以海洋生物有机硫为主,其份数分别为65%~68%和67%~77%,而FA-S则以成岩有机硫为主(54%~73%)。相对于生物有机硫,成岩有机硫更易被碱和酸性Cr(Ⅱ)溶液提取,因此腐殖质硫和non-CROS都不能全面反映沉积物中有机硫的组成和来源。黄铁矿和腐殖质中成岩有机硫含量随深度的同步增加表明黄铁矿形成并未明显地竞争性抑制有机质硫化。
有機硫是海洋沉積物中重要的硫形態,其中成巖有機硫對有機質保存和微量元素形態具有重要影響。利用化學提取及硫穩定同位素研究瞭膠州灣沉積物中堿可提取的腐殖痠硫(HA-S)、富裏痠硫(FA-S)以及鉻不可還原有機硫(non-CROS)的垂直分佈、來源及形成機製。結果錶明,non-CROS、HA-S以及FA-S的含量範圍分彆為19.1~52.6、3.35~7.82和27.3~38.6μmol/g,均處于其他許多近海沉積物中含量的低值區,且3者均為海洋生物有機硫和成巖有機硫的混閤物。HA-S 和 non-CROS以海洋生物有機硫為主,其份數分彆為65%~68%和67%~77%,而FA-S則以成巖有機硫為主(54%~73%)。相對于生物有機硫,成巖有機硫更易被堿和痠性Cr(Ⅱ)溶液提取,因此腐殖質硫和non-CROS都不能全麵反映沉積物中有機硫的組成和來源。黃鐵礦和腐殖質中成巖有機硫含量隨深度的同步增加錶明黃鐵礦形成併未明顯地競爭性抑製有機質硫化。
유궤류시해양침적물중중요적류형태,기중성암유궤류대유궤질보존화미량원소형태구유중요영향。이용화학제취급류은정동위소연구료효주만침적물중감가제취적부식산류(HA-S)、부리산류(FA-S)이급락불가환원유궤류(non-CROS)적수직분포、래원급형성궤제。결과표명,non-CROS、HA-S이급FA-S적함량범위분별위19.1~52.6、3.35~7.82화27.3~38.6μmol/g,균처우기타허다근해침적물중함량적저치구,차3자균위해양생물유궤류화성암유궤류적혼합물。HA-S 화 non-CROS이해양생물유궤류위주,기빈수분별위65%~68%화67%~77%,이FA-S칙이성암유궤류위주(54%~73%)。상대우생물유궤류,성암유궤류경역피감화산성Cr(Ⅱ)용액제취,인차부식질류화non-CROS도불능전면반영침적물중유궤류적조성화래원。황철광화부식질중성암유궤류함량수심도적동보증가표명황철광형성병미명현지경쟁성억제유궤질류화。
Organic sulfur (OS)is an important sulfur pool in marine sediments.Sulfurization of organic matter (OM)helps to enhance the preservation of OM and exerts an important impact on mobility of trace elements. Chemical extractions were used to quantify base-extractable humic-acid sulfur (HA-S),fulvic-acid sulfur (FA-S) and non-chromium-reducible OS (non-CROS)in Jiaozhou Bay sediments,and sulfur stable isotope was used to trace their sources and mechanisms of formation.Results show that non-CROS,HA-S and FA-S contents are 1 9.1 to 52.6,3.35 to 7.82,and 27.3 to 38.6μmol/g,respectively,being at the lower ends of the respective contents in many other marine sediments.The three OS pools are mixtures of diagenetic and marine biogenic OS,with the HA-S and non-CROS dominated by biogenic OS (65% to 68% and 67% to 77%,respectively),while the FA-S dominated by diagenetic one (54% to 73%).Relative to the biogenic OS,diagenetic OS is more readily extracted by both base and acidic Cr(Ⅱ)solutions.Thus both base-extractable OS (i.e.,HA-S+FA-S)and non-CROS can-not truly reflect the compositions and sources of OS in the bulk sediments.Simultaneous downcore increase in con-tents of pyrite-S and diagenetic OS in humic substances suggests that pyrite formation has not competitively inhibi-ted OM sulfurization to a significant extent.
