The aim of this paper was to evaluate the status and trends of water quality in a stressed coastal lagoon in Cartagena, Colombian Caribbean. The water quality data over an eight-year period was analyzed. The study was focused on water parameters as dissolved oxygen (DO), biochemical oxygen demand (BOD5), chemical oxygen demand (COD), salinity, pH, total dissolved solids, total coliforms (TC), ammonium (NH4 +) and total phosphorus (TP). The analysis was conducted in line with Colombian national water standard. Results showed that BOD5, COD and phosphorus are out of the limits for this variables in Colombia. Principal components analysis detected four components that explain 70 % of the variance of data and showed that anthropogenic and temporal factors might be affecting the variation. 1340 Ildefonso Baldiris-Navarro et al.
In the present work, proton exchange membranes were prepared from SEBS copolymer and natural latex modified with vanadium pentoxide (V2O5) to evaluate its performance as an electrolyte in a fuel cell through the characterization of its physicochemical and mechanical properties. The results show that the 0.5% V2O5 addition was favorable for the water absorption test due to its hydrophilic character. The ion exchange capacity had a similar behavior since water is the means for the main mechanisms of protons to occur inside the membrane. The stretching properties and maximum effort decrease with increasing the V2O5 load, but it boosted the Young's modulus. With the FTIR analysis, the presence of V2O5 was verified in the loaded membranes. Therefore, it is necessary to improve ion exchange capacity and mechanical properties to apply this membranes as an electrolyte in a fuel cell.
The aim of this paper was to assess the capability of freshwater microalgae Chlorella vulgaris to remove and biodegrade phenol from wastewater. Microalgae was exposed to different concentrations of the chemical at during four days. Phenol concentration was measured using spectrophotometric method and cell growth was measured by neubauer chamber and optical density. The results showed the ability of chlorella vulgaris to remove the pollutant in short periods of time at both concentration but specially at high phenol concentration (100 ppm). The mean phenol removal value for 50 ppm solution was 75% and 98% for 100 ppm solution. Results also showed a growth inhibition for both phenol concentration. This study demonstrated that Colombian native Chlorella vulgaris could be used for treatment of contaminated aqueous systems. 1962 Ildefonso Baldiris-Navarro et al.
Abstract-The quality of the surface water of Caño Correa and its influence on the coral reefs of the Corales del Rosario and San Bernardo National Natural Park located in the waters of the Colombian Caribbean were analyzed. Multivariate analysis of the water quality data-set was performed through PCA. The statistical analysis showed that the nutrients are at levels close to eutrophication, the solids exceed the levels established by the regulations and the salinity presents abrupt changes in their levels, all these factors affect the health of the marine ecosystems. The principal component analysis identified four components that explain 67.27% of the total variance of the data. The first factor represents the agroindustrial contribution, the second factor represents pollution by minerals and organic matter, the third factor is due to wastewater-fertilization and the fourth factor is clearly microbiological.
Coastal lagoons are one of the most threatened ecosystems in the world, because of population growth, habitat destruction, pollution, wastewater, overexploitation and invasive species which are the main causes of their degradation. The objective of this paper was to evaluate the water quality behavior in a stressed coastal lagoon in Cartagena, Colombian Caribbean. Environmental data was analyzed using hypothesis testing, confidence intervals, and also Principal components analysis (PCA). The study was focused on water parameters such as dissolved oxygen (DO), biochemical oxygen demand (BOD5), chemical oxygen demand (COD), salinity, pH, total dissolved solids, total coliforms (TC), Fecal coliforms (FC), ammonium (NH4+) and total phosphorus (TP). The analysis was conducted in line with the Colombian national water standard. Results showed that BOD5, COD, phosphorus, and coliforms are out of the limits for these variables in Colombia and are reaching levels that may be a threat to human health. Principal components analysis detected five components that explained 79.4% of the variance of data and showed that anthropogenic and temporal factors might be affecting the variation of the parameters.
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