春季黄渤海沉积物中酸可挥发性硫与黄铁矿的分布特征及影响因素

Distributions and influence factors of Acid Volatile Sulfide and Pyrite in the Bohai Sea and Yellow Sea in spring

依据2010年4月22日~5月6日对黄渤海调查所得的数据,分析了该海域酸可挥发性硫(AVS)及黄铁矿的含量及分布特征,并对其影响因素进行了初步探讨。结果表明,春季,调查海域沉积物中AVS的含量范围为0~16.04μmol/g dry,平均值为(1.67±1.05)μmol/g dry。AVS含量在不同海区表现为南黄海最低,渤海其次,北黄海略高于渤海。平面分布上,AVS的平面分布呈现近岸高、远海低的特征。AVS的垂直分布则呈先升高后降低的趋势,有78.8%的站位AVS含量最大值出现在5 cm^20 cm。AVS含量的变化主要与沉积物的氧化还原状态、有机质的含量及沉积类型等多种因素有关。调查海区沉积物中黄铁矿的含量范围为(0.89~94.4)μmol/g dry,平均值为(22.68±18.64)μmol/g dry。本次调查的所有站位AVS与黄铁矿比值普遍小于0.3,反应了AVS在深处可有效转化为黄铁矿的趋势。

Based on data from the cruise carried out in the Yellow Sea and Bohai Sea from April 22 to May 8,2010,the concentrations and distributions of Acid Volatile Sulfide（ AVS） and pyrite were studied. Their possible influencing factors were also discussed in this paper. The results showed that the concentration of AVS in the Yellow Sea and Bohai Sea ranged from 0 to 16. 04 μmol / g dry. And its average concentration was（ 1. 67 ± 1. 05） μmol / g dry. The concentration of AVS in South Yellow sea was the lowest in research area,Bohai sea was the second,while the North Yellow sea was slightly higher than that in Bohai sea. Furthermore,the horizontal distribution of AVS in spring showed that the concentration of AVS decreased from inshore to offshore. As for vertical distribution,it increased at first and then declined with increasing in depth. Among our studied stations,there were about 78. 8% sites maximum AVS content appearing at 5 cm to 20 cm. The redox state of sediment,organic matter and sediments type can affect the concentration of AVS. As for pyrite,it ranged from 0. 89 to 94. 4 μmol / g dry,and its average concentration was（ 22. 68 ± 18. 64） μmol / g dry。The ratio of AVS and pyrite was less than 0. 3 at most sites in our research,which showed that AVS can convert to pyrite effectively in the deep layer.