Department of Molecular Biology and Biotechnology, Faculty of Biology and Geology, Babeş-Bolyai University, 5-7 Clinicilor Str., 400006, Cluj-Napoca, Romania.
INCDO-INOE 2000, Research Institute for Analytical Instrumentation, 67 Donath Str., 400293, Cluj-Napoca, Romania.
Sci Rep. 2021 Sep 20;11(1):18633. doi: 10.1038/s41598-021-97904-1.
In this study we aimed to compare the mineralogical, thermal, physicochemical, and biological characteristics of recent organic carbon-rich sediments ('sapropels') from three geographically distant Romanian lakes (Tekirghiol and Amara, SE Romania, and Ursu, Central Romania) with distinct hydrogeochemical origins, presently used for pelotherapy. The investigated lakes were classified as inland brackish Na-Cl-sulfated type (Amara), coastal moderately saline and inland hypersaline Na-Cl types (Tekirghiol and Ursu, respectively). The settled organic matter is largely composed of photosynthetic pigments derived from autochthonous phytoplankton. Kerogen was identified in the sapropel of coastal Tekirghiol Lake suggesting its incipient maturation stage. The mineral composition was fairly similar in all sapropels and mainly consisted of quartz, calcite, and aragonite. Smectite, illite, mixed layer smectite/illite appeared as major clay components. Potentially toxic elements were found in low concentrations. The physical properties (i.e., specific heat, thermal conductivity and retentivity) and cation exchange capacity are comparable to other peloids used for therapy. This study is the first comprehensive multi-approached investigation of the geochemical nature of recent sapropels in Romanian saline lakes and thus contributes to expanding our knowledge on the origin and physicochemical qualities of organic matter-rich peloids with therapeutic uses.
在这项研究中，我们旨在比较三个地理位置不同的罗马尼亚湖泊（东南罗马尼亚的特基尔吉奥尔湖和阿玛拉湖，以及中罗马尼亚的乌尔苏湖）近期富含有机碳的沉积物（“腐泥”）的矿物学、热学、物理化学和生物学特征，这些沉积物具有不同的水文地球化学起源，目前用于泥疗。研究的湖泊被分类为内陆咸水 Na-Cl-硫酸盐型（阿玛拉湖）、沿海中度咸水和内陆过咸水 Na-Cl 型（特基尔吉奥尔湖和乌尔苏湖）。沉降的有机物主要由源自自生浮游植物的光合作用色素组成。在沿海特基尔吉奥尔湖的腐泥中鉴定出了干酪根，表明其处于初始成熟阶段。所有腐泥中的矿物组成都相当相似，主要由石英、方解石和文石组成。蒙脱石、伊利石、蒙脱石/伊利石混合层是主要的粘土成分。潜在的有毒元素浓度较低。物理性质（如比热、热导率和储能）和阳离子交换容量与用于治疗的其他泥灰岩相当。本研究是对罗马尼亚盐湖近期腐泥地质化学性质的首次综合多方法研究，有助于扩大我们对具有治疗用途的富含有机物泥灰岩的起源和物理化学性质的认识。
