What is it about?

This study provides an integrated physicochemical characterization of freshly extracted sapropelic mud from Techirghiol Lake, a hypersaline lagoon on the Romanian Black Sea coast. Mud samples collected from three established therapeutic mud islands were analyzed to determine their physical properties, mineral and organic composition, particle-size distribution, exchangeable bases, trace elements, and sulfur compounds. The analyzed mud had an alkaline pH of approximately 8.2, a water content of 71.24%, and a predominantly fine-grained structure. Its mineral fraction was characterized by sodium, magnesium, calcium, and potassium, while its organic components included humic substances, proteins, lipids, pectic substances, and bituminous compounds. An important finding was the quantification of sulfur compounds, including total hydrogen sulfide (0.1257%) and its free and bound fractions. Together, these measurements provide a detailed physicochemical profile of Techirghiol sapropelic mud as a complex mineral–organic material used in balneotherapy.

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Why is it important?

The scientific evaluation of therapeutic muds requires more than a description of their traditional medical use. Their mineral, organic, and physicochemical characteristics must be documented to support material characterization, comparison, and future quality assessment. This study integrates several analytical dimensions that are often investigated separately, including mineral composition, organic constituents, particle-size distribution, exchangeable bases, trace elements, and sulfur compounds. The findings establish a physicochemical reference profile for freshly extracted Techirghiol sapropelic mud from the investigated therapeutic area. The distinction between free and bound sulfur compounds, together with the detailed mineral and organic analyses, is particularly relevant for understanding the complexity of the peloid matrix. These results may support future research into environmental variability, material stability, therapeutic preparation, and quality control. However, physicochemical composition does not establish clinical efficacy, skin absorption of specific elements, or biological mechanisms of action. These questions require separate experimental and clinical investigations.

Perspectives

As the first author of this study and a physician in Physical Medicine, Rehabilitation, and Balneology, I consider the detailed characterization of Techirghiol sapropelic mud an important part of our broader research program on natural therapeutic resources. Our 2025 study in Water examined microvascular characteristics of human skin and muscle following different balneotherapy procedures. The present investigation addresses a complementary question: what are the physicochemical characteristics of the natural material used in these treatments? The detailed analysis of mineral and organic constituents, together with the quantification of free and bound sulfur compounds, provides a foundation for investigating the properties of Techirghiol mud under different environmental and therapeutic preparation conditions. I believe that future progress in balneotherapy research requires the integration of physicochemical characterization, histological observations, and well-designed clinical investigations. An important next step is to examine how exposure to environmental conditions may affect freshly extracted sapropelic mud and whether such changes are relevant to its preparation and use in balneotherapy. These complementary approaches may help develop more rigorous methods for the characterization, quality assessment, and scientific investigation of therapeutic peloids.

Dr Traian Virgiliu Surdu
Universitatea Ovidius din Constanta

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This page is a summary of: Integrated Physicochemical Characterization of Techirghiol Sapropelic Mud and Its Relevance for Balneotherapy, Water, June 2026, MDPI AG,
DOI: 10.3390/w18121398.
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