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于1993年5月和1994年3－4月通过调查，用硫离子选择电极法研究南沙群岛海域泻湖及礁外沉积物间隙水中的∑S（－Ⅱ）及SO~(2-)_4，探讨泻湖内及礁外间隙水中-2价硫的分布特征，沉积物-海水界面间硫的扩散转移通量和-2价硫的热力学平衡控制体系。结果表明，该海区∑S（－Ⅱ）含量，泻湖间隙水中远比礁外高，人为活动剧烈的礁内泻湖高于人为活动少的泻湖，离礁近的礁外间隙水中的高于远离礁的间隙水中的。在礁外沉积物间隙水中-2价硫含量呈垂向增加的趋势，沉积物-海水界面间HS-，S2-均是从沉积物向上覆海水扩散，SO反之。礁内泻湖的扩散量远高于礁外的，HS-扩散总平均为61．34μmol／（m2·d），SO为-0．41mmol／（m2·d）；礁外泻湖的HS-总平均为14．96μmol／（m2·d），SO为-0．35mmol／（m2·d）。该海区的-2价硫主要由S＋2e→S2-氧化还原电对控制，平衡时Eh计算值与实测值接近，单质疏作为亚稳态可存在于沉积物中，并可与溶解铁继续形成自生黄铁矿（FeS2）沉淀。
In May 1993 and from March to April 1994, we investigated the ΣS (-Ⅱ) and SO ~ (2 -) _4 in the interstitial water of lagoons and reefs in the Nansha Islands by Sulfide Electrode. The distribution characteristics of -2 sulfur in the lagoon and outer reef water, the diffusion flux of sulfur between the sediment-seawater interface and the thermodynamic equilibrium control system of -2 sulfur. The results show that ΣS (-Ⅱ) content in the sea area is much higher than that in the lagoon interstitial water. The lagoons in the reef with high anthropogenic activity are higher than the lagoons with less human activities. The gap in the water. In the reef sediment interstitial water, the -2-valent sulfur content showed a vertically increasing trend. Both sediments-seawater interface HS- and S2- diffused from the sediment to the overlying seawater, and SO conversely. The diffusion of lagoon in the reef was much higher than that of the reef. The average HS-diffusion was 61.34μmol / (m2 · d) and SO was -0.41mmol / (m2 · d) Was 14.96μmol / (m2 · d), SO was -0.35mmol / (m2 · d). The 2-valent sulfur in the sea area is mainly controlled by the S + 2e → S2-redox couple. The calculated Eh at equilibrium is close to the measured value. The simple substance sparse as a metastable state may exist in the sediment and may continue to form with the dissolved iron Pyrite (FeS2) precipitation.