Sources and formation mechanisms of organic sulfur in Jiaozhou Bay sediments

Huang Xiangli; Zhu Maoxu; Chen Liangjin; Li Tie

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Huang Xiangli, Zhu Maoxu, Chen Liangjin, Li Tie. Sources and formation mechanisms of organic sulfur in Jiaozhou Bay sediments[J]. Haiyang Xuebao, 2014, 36(6): 50-57.

Citation:

Huang Xiangli, Zhu Maoxu, Chen Liangjin, Li Tie. Sources and formation mechanisms of organic sulfur in Jiaozhou Bay sediments[J]. Haiyang Xuebao, 2014, 36(6): 50-57.

Huang Xiangli, Zhu Maoxu, Chen Liangjin, Li Tie. Sources and formation mechanisms of organic sulfur in Jiaozhou Bay sediments[J]. Haiyang Xuebao, 2014, 36(6): 50-57.

Citation:

Huang Xiangli, Zhu Maoxu, Chen Liangjin, Li Tie. Sources and formation mechanisms of organic sulfur in Jiaozhou Bay sediments[J]. Haiyang Xuebao, 2014, 36(6): 50-57.

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Sources and formation mechanisms of organic sulfur in Jiaozhou Bay sediments

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2013-07-19

Abstract

Abstract

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 19.1 to 52.6,3.35 to 7.82,and 27.3 to 38.6 μmol/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 cannot truly reflect the compositions and sources of OS in the bulk sediments. Simultaneous downcore increase in contents of pyrite-S and diagenetic OS in humic substances suggests that pyrite formation has not competitively inhibited OM sulfurization to a significant extent.
- marine sediments,
- biogenic organic sulfur,
- diagenetic organic sulfur,
- sulfur isotopes,
- Jiaozhou Bay

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References(34)

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