background: there is a rapid increase worldwide in the consumption of mineral waters which may contain different level of radioactive elements, especially 226ra, in addition to varying amounts of beneficial salts. therefore, a comprehensive study was planned and carried out in order to determine concentration of 226ra natural radionuclide in bottled mineral waters that commercially available in...

The quality of mineral water commercialized in Brazil regarding the microbial content was analyzed and the results were compared with the standards established by the current legislation. Results demonstrated there was no bacterial contamination, but several types of fungi were found. Therefore, bottled mineral water could be considered a possible route for the transmission of filamentous fungi...

The genus Caulerpa is known for its invasion of tropical, subtropical, and temperate coastal waters. Whereas the role of humans as vectors for the introduction of Caulerpa has been well documented, other anthropogenic factors that may mediate the success of an invasion are poorly understood. We provide evidence that a recent invasion of Caulerpa ollivieri into shallow Bahamian seagrass meadows ...

Tidal forcing and its fortnightly variation are known to be one of the main regulating agents of physical and biogeochemical signatures in the Strait of Gibraltar and surrounding areas. Samples obtained during spring and neap tides in the region were analyzed to determine the influence of this tidal variation on the submesoscale distribution of water masses and biological elements. During sprin...

Abstract Mine waters are a significant point source stressor for aquatic environments, not only due to their acidity and high metal concentrations, but also because of electrolyte concentrations. Ion-rich mine can disturb the seasonal mixing lake waters, even leading permanent stratification, i.e. meromixis. In this study, we investigated two small natural lakes receiving from closed Ni-Cu mine...

Fouling of membranes decreases the applicability of the nanofiltration (NF) process, and thus a deeper understanding of membrane fouling is needed. Fouling and retention of different NF membranes by model feed waters was investigated in a laboratory-scale filtration unit. The model waters were composed so as to imitate the characteristics of chemically pre-treated surface water. No differences ...

The distribution and reproductive success of fish were examined in Dutch soft waters of varying pH. In total, 20 fish species were encoun­ tered. The lowest pH-values at which fish species were observed varied remarkably. Umbra pygmaea and Tinea tinea appeared to be extremely acid tolerant and occurred in waters with pH-values below 4.0. Abramis brarna, Cyprinus carpio, E’sox iucius, Misgumus f...

Concrete sewer pipes can be deteriorated by sulfuric acid (H2SO4), which is created the oxidation of hydrogen sulfide in presence certain bacteria inside sewers. This process called biocorrosion. In this paper, H2SO4 (i.e., chemical, non-biogenic) was used to study attack on concrete samples. The authors conducted experiments under different flows and concentrations, account for conditions prev...