BIOGEOCHEMICAL TRANSFORMATIONS OF SULPHUR IN THE SALINE LAKES OF TRANSBAIKALIA

IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY
 V. BORZENKO S,  A. FEDOROV I,  A. KOMOGORTSEVA I
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Abstract

Biogeochemical transformations of sulphur in the saline lakes of southeastern Transbaikalia have been studied. Quantitative measurements show that hydrogen sulphide is present in the water and bottom sediments of most of the lakes studied. In addition to hydrogen sulphide, the presence of sulphate, thiosulphate, and elemental sulphur was detected in the water column, while sulphate and elemental sulphur were found in the bottom sediments. It was established that elemental sulphur exists in the lakes primarily in the form of suspension and colloids, as well as polysulphidic sulphur, the amount of which increases with increasing water pH. It is concluded from the isotopic ratios of sulphur for sulphate, hydrosulphide ions, and elemental sulphur that sulphur in the studied natural systems is controlled by biological and geochemical processes. One of the processes controlling the behaviour of sulphate ions in the lakes is sulphate reduction, which leads to the enrichment of sulphate sulphur and depletion of sulphur in hydrogen sulphide with the 34S isotope. It is shown that oxidation of reduced sulphur in the lakes proceeds with the participation of oxygen, iron, manganese, as well as various bacteria. The presence of an additional source of sulphur and/or absence of sulphur reduction causes 32S accumulation in sulphate ions. It is determined that the loss of sulphate ions due to their bacterial reduction in bottom sediments is most pronounced in the chloride and soda lakes of the I and III subtypes. In the sulphate and soda lakes of the II subtype, an increase in the amount of sulphate ions was detected.
外贝加尔盐湖中硫的生物地球化学转化
研究了外贝加尔东南部盐湖中硫的生物地球化学转化。定量测量结果表明,所研究的大多数湖泊的湖水和湖底沉积物中都存在硫化氢。除硫化氢外,水体中还检测到硫酸盐、硫代硫酸盐和元素硫的存在,而在湖底沉积物中则发现了硫酸盐和元素硫。研究证实,湖泊中的元素硫主要以悬浮物和胶体的形式存在,同时还存在多硫化物硫,其含量随水体 pH 值的增加而增加。根据硫酸根、硫氢离子和元素硫的同位素比值得出的结论是,所研究的自然系统中的硫受生物和地球化学过程的控制。控制湖泊中硫酸根离子行为的过程之一是硫酸根还原,这导致硫酸根硫的富集和硫化氢中 34S 同位素硫的贫化。研究表明,湖泊中还原硫的氧化过程有氧、铁、锰以及各种细菌的参与。额外硫源的存在和/或硫还原的缺失会导致 32S 在硫酸根离子中积累。据测定,在 I 和 III 亚型的氯化物湖和苏打湖中,由于底层沉积物中细菌的还原作用,硫酸根离子的损失最为明显。在 II 亚型的硫酸盐湖和苏打湖中,发现硫酸根离子的数量有所增加。
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来源期刊
Chemistry for Sustainable Development
Chemistry for Sustainable Development CHEMISTRY, MULTIDISCIPLINARY-
自引率
25.00%
发文量
52
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