Examinando por Materia "Cobre"

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    Determinación cuantitativa de arsénico, cobre, níquel y plomo en margarinas y mantequillas expendidas en el mercado de Caquetá – San Martin de Porres – periodo de Junio–Octubre 2015
    (Universidad Privada Norbert Wiener, 2015) Altamirano Verastegui, Luis Antonio; Cruz Quispe, Edwin; Churango Valdez, Javier
    Margarine and butter are widely consumed products, being among the most commonly used cooking ingredients alongside oil. Investigating their quality is of great importance from both health and commercial perspectives. Heavy metals pose a serious risk as they tend to bioaccumulate in biological organisms, increasing their concentration and potentially causing harmful effects on internal organs, the nervous system, kidneys, liver, and lungs. For this reason, a study was conducted to quantitatively determine the levels of arsenic, copper, nickel, and lead in margarines and butters sold at the Caquetá market in San Martín de Porres during the period June–October 2015, using atomic absorption spectrophotometry. Seventeen samples of margarines and butters were collected for analysis. The results showed that the average concentrations of arsenic, copper, nickel, and lead were: As 0.07 mg/kg, Cu 0.09 mg/kg, Ni 0.28 mg/kg, and Pb 0.11 mg/kg. These results were compared against the Codex Alimentarius, the Ecuadorian Technical Standard, and the Venezuelan Technical Standard.
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    PublicaciónAcceso abierto
    Determinación cuantitativa de cadmio, plomo y cobre en hígado de ganado bovino expendidos en mercados: Central, 03 de Febrero y Camal de Yerbateros durante setiembre del 2014
    (Universidad Privada Norbert Wiener, 2015) Cristobal Palomares, Jhovani Walter; Cruz Orihuela, Ruth Rosalyn; Churango Valdez, Javier
    The objective of this study was to quantitatively determine the concentration of cadmium, lead, and copper in bovine liver sold at the Central Market, 03 de Febrero, and the Yerbateros Slaughterhouse during September 2014. The method used for the quantification of these metals was Atomic Absorption Spectrophotometry with a graphite furnace. The cadmium levels found in the twenty-five liver samples showed an average of 9.59 mg Cd/kg liver, with a minimum value of 5.89 mg/kg and a maximum value of 14.11 mg/kg. Lead levels in the samples showed an average of 52.26 mg Pb/kg liver, with a minimum of 28.34 mg/kg and a maximum of 75.85 mg/kg. Finally, copper levels in the samples showed an average of 1.70 mg Cu/kg liver, with a minimum of 0.78 mg/kg and a maximum of 3.09 mg/kg. The results indicate that the bovine liver samples exceed the established cadmium, lead, and copper limits according to the Official Mexican Standard and European Union regulations. Therefore, it is concluded that the liver samples contain Cd, Pb, and Cu above the permitted levels according to international standards, posing a potential health risk for consumers.