太湖沉积物中无机硫的化学特性

The chemical characteristic of inorganic sulfur in Taihu Lake sediments

选取太湖富营养化相对较严重的梅梁湾北部（ML）与西五里湖（WL）为研究对象，对沉积物及其间隙水中的无机硫形态进行了分析.结果表明，WL和ML间隙水中Fe^2＋的平均含量分别为72.1-162.7μmol/L和63.0-182.7μmol/L，是∑S^2-的18倍和6倍，分析认为，太湖沉积物中的还原环境是以Fe^3＋为主导而并非SO4^2-.沉积物中酸性可挥发性硫化物（AVS）的含量为1.0-11.7μmol/g，在未受污染湖泊范围之内.黄铁矿态硫（Pyrite-S）/AVS〉3，表明AVS能够高效地转化为黄铁矿，也说明黄铁矿是SO4^2-还原的主要产物.沉积物中黄铁矿化程度（DOP）〈10%、硫化程度（DOS）〈14%，说明黄铁矿的形成主要受SO4^2-的控制.

Selecting Meiliang Bay （ML） and Wuli Lake （WL） of Taihu Lake suffering relatively severe eutrophication as studied object, the analysis of inorganic sulfur in sediment and its interstitial water was carded out. The average contents Fe^2＋ in the interstitial waters of WL and ML were 72. 1-162.7μmol/L and 63.0-182.7μmol/L respectively, being 18 times and 6 times of ∑S^2-, which indicated that the reduced environment in Talhu Lake sediment was dominated by Fe^3＋ rather than SO4^2-. The content of acid volatile sulfide （AVS） was 1.0 to 11 .7μmol/g, which was in the range of unpolluted lake. Pyrite-S/AVS〉3 showed that AVS could be transformed to pyrite efficiently; at the same time, pyrite was the main product of SO4^2-. The degree of pyritization （DOP）〈10% and degree of sulphidization （DOS）〈14% all indicated that the formation of pyrite was controlled mainly by SO4^2-.