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  • 1
    Publication Date: 2021-08-09
    Description: The search for coatings that extend the useful life of biomedical devices has been of great interest, and titanium has been of great relevance due to its innocuousness and low reactivity. This study contributes to the investigation of Ti/Ag films in different configurations (monolayer and multilayer) deposited by magnetron sputtering. The sessile droplet technique was applied to study wettability; greater film penetrability was obtained when Ag is the external layer, conferring high efficiency in cell adhesion. The morphological properties were characterized by SEM, which showed porous nuclei on the surface in the Ag coating and crystals embedded in the Ti film. The structural properties were studied by XRD, revealing the presence of TiO2 in the anatase crystalline phase in a proportion of 49.9% and the formation of a silver cubic network centered on the faces. Tafel polarization curves demonstrated improvements in the corrosion current densities of Ag/Ti/Ag/Ti/Ag/Ti/Ag/Ti and Ti/Ag compared to the Ag coating, with values of 0.1749, 0.4802, and 2.044 nA.m−2, respectively. Antimicrobial activity was evaluated against the bacteria Pseudomonas aeruginosa and Bacillus subtilis and the yeasts Candida krusei and Candida albicans, revealing that the Ti/Ag and Ag/Ti/Ag/Ti/Ag/Ti/Ag/Ti coatings exhibit promise in biomedical material applications.
    Electronic ISSN: 1420-3049
    Topics: Chemistry and Pharmacology
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  • 2
    Publication Date: 2024-04-11
    Description: The validation of the Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) was carried out. In the first, a potassium acid phthalate standard and a spectrophotometric detection method were used, and for the second, the reading of samples was implemented by membrane electrode, a standard glutamic acid-glucose solution and incubation for 5 days at 20 ± 1ºC. Parameters were determined as linearity, precision, accuracy, sensitivity, limit of detection and quantification. It was demonstrated through experimental design and statistical procedures that methods can be used with sensitivity and confidence. Detection and quantification limits of 46.2 and 100 mg/L for COD and 2.78 and 4.71 mg / L for BOD were reached. In both tests a coefficient of variation for repeatability and reproducibility between 0.001 - 0.055% and 0.001 - 0.022% was evidenced; in accuracy, error and recovery percentages were obtained between 0.04 - 3.39% and 95.0 and 103% respectively.
    Description: Published
    Description: Se realizó la validación de la Demanda Química de Oxígeno (DQO) y Demanda Bioquímica de Oxígeno (DBO). En la primera se utilizó estándar de ftalato ácido de potasio y un método de detección espectrofotométrico y para la segunda, se implementó la lectura de muestras por electrodo de membrana, una solución estándar de glucosa-ácido glutámico e incubación por cinco días a 20±1ºC. Se determinaron parámetros como linealidad, precisión, exactitud, sensibilidad, límite de detección y cuantificación. Se demostró mediante el diseño experimental y los procedimientos estadísticos que se pueden emplear los métodos con sensibilidad y confianza. Se alcanzaron límites de detección y cuantificación de 46.2 y 100 mg/L para DQO y 2.78 y 4.71 mg/L para DBO. En ambas pruebas se evidenció un coeficiente de variación para repetibilidad y reproducibilidad entre el 0.001 - 0.055% y 0.001 – 0.022%; en la exactitud se obtuvieron porcentajes de error y recuperación entre el 0.04 – 3.39% y 95.0 y 103% respectivamente.
    Keywords: Agua residual ; Biodegradabilidad ; Calidad de agua ; Método de validación ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TQ Environmental science, engineering and technology::TQS Sanitary and municipal engineering::TQSR Waste treatment and disposal
    Language: Spanish
    Format: application/pdf
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  • 3
    Publication Date: 2024-04-11
    Description: Published
    Description: El lector podrá encontrar en el libro las definiciones más importantes en los procesos de validación de métodos analíticos; acceder a la validación de la demanda química de oxígeno y demanda bioquímica de oxígeno para la determinación del contenido de materia orgánica y biodegradabilidad en aguas residuales de un ingenio azucarero. También, encontrará contribuciones a la evaluación de metales pesados (plomo y cadmio) en agua cruda y potable por espectroscopia de absorción atómica con horno de grafito del acueducto del municipio de Cerrito. Así mismo, la validación del método de análisis para nitratos en agua potable del corregimiento Paso de la bolsa del municipio de Jamundí mediante la técnica de espectroscopia ultravioleta. El libro hace énfasis en la importancia de la medición de los parámetros fisicoquímicos en el proceso de potabilización y control de calidad de agua pozo del Paraíso (Santander de Quilichao) utilizada en una planta de tratamiento de agua y en el seguimiento del crecimiento microbiano en una laguna facultativa de un ingenio azucarero del Valle del Cauca.
    Keywords: Precisión ; Linealidad ; Validación ; Espectrofotometría ; Metales ; Agua potable ; Trazabilidad ; Espectroscopia UV-Vis ; Potabilización ; Sólidos disueltos ; Coagulantes ; Floculantes ; pH ; Aguas residuales ; Ingenio azucarero ; Laguna facultativa ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TQ Environmental science, engineering and technology::TQS Sanitary and municipal engineering::TQSR Waste treatment and disposal
    Language: Spanish
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  • 4
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    Universidad Santiago de Cali | Aportes analíticos al estudio de aguas residuales y potables
    Publication Date: 2024-04-11
    Description: an overview of the validation methods, the parameters estimated in it and the possible applications they represent for a laboratory are presented.
    Description: Published
    Description: Se presenta un acercamiento de los métodos de validación, los parámetros que se estiman en la misma y las posibles aplicaciones que representan para un laboratorio.
    Keywords: Precisión ; Exactitud ; Linealidad ; Limite detección ; Limite cuantificación ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TQ Environmental science, engineering and technology::TQS Sanitary and municipal engineering::TQSR Waste treatment and disposal
    Language: Spanish
    Format: application/pdf
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