Examinando por Materia "Nickel"

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Acceso abierto
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.
Acceso abierto
Determinación cuantitativa de arsénico, níquel y cobalto en las tintas para tatuaje corporal comercializados en Lima Metropolitana durante el periodo enero–febrero 2018
(Universidad Privada Norbert Wiener, 2018-07-05) Idrogo Delgado, César Olmedo; Montenegro Diaz, Evelyn Marianela; Lizano Gutiérrez, Jesús Víctor
In this research, the concentrations of Arsenic, Nickel, and Cobalt were determined in samples of tattoo inks marketed in Metropolitan Lima, in order to establish whether these were within the permissible concentrations according to EPA 0128: Environmental Protection Authority Guidelines for Tattooing and Permanent Makeup. A total of 15 samples from different brands of tattoo inks marketed in Metropolitan Lima were collected, with black, red, and blue selected as the colors most frequently used in tattoo practice. The metals were quantified by Graphite Furnace Atomic Absorption Spectrophotometry. The average levels of Arsenic, Nickel, and Cobalt in the blue ink samples were 0.12, 0.20, and 30.0 ppm, respectively. The average levels of Arsenic, Nickel, and Cobalt in the black ink samples were 0.13, 14.29, and 0.49 ppm, respectively, while the average levels of Arsenic, Nickel, and Cobalt in the red ink samples were 0.23, 0.16, and 0.45 ppm, respectively. The values found were compared with the parameters established by EPA 0128.