Search results for: R. Muñiz-Valencia

Items from 1 to 9 out of 9 results

article

Measurement of organochlorine pesticides in drinking water: laboratory technical proficiency testing in Mexico

J. B. Leyva-Morales, P. J. Bastidas-Bastidas, R. Muñiz-Valencia, S. G. Ceballos Magaña, more

Accreditation and Quality Assurance > 2019 > 24 > 6 > 451-461

An interlaboratory comparison exercise was performed to assess the technical proficiency of laboratories in measuring the organochlorine pesticides in drinking water. The homogeneity and stability of the samples to be used in the test were evaluated, the assigned value and the standard deviation were determined according to ISO Guide 35 and ISO standard 17043, and the results showed that the samples...

article

Some practical considerations for linearity assessment of calibration curves as function of concentration levels according to the fitness-for-purpose approach

J.M. Jurado, A. Alcázar, R. Muñiz-Valencia, S.G. Ceballos-Magaña, more

Talanta > 2017 > 172 > C > 221-229

Since linear calibration is mostly preferred for analytical determinations, linearity in the calibration range is an important performance characteristic of any instrumental analytical method. Linearity can be proved by applying several graphical and numerical approaches. The principal graphical criteria are visual inspection of the calibration plot, the residuals plot, and the response factors plot,...

article

Preparation of activated carbons from pecan nutshell and their application in the antagonistic adsorption of heavy metal ions

I.A. Aguayo-Villarreal, A. Bonilla-Petriciolet, R. Muñiz-Valencia

Journal of Molecular Liquids > 2017 > 230 > C > 686-695

Activated carbons have been synthetized using the pecan nutshell (Carya illinoinensis) biomass for the adsorption of heavy metal ions. Adsorbents with different surface and ion exchange properties were obtained using physical and chemical activation routes with different reagents. These activated carbons have been assessed and compared in the removal of heavy metal ions Zn²⁺, Cd²⁺, Ni²⁺ and Cu²⁺ given...

article

Comparative study of As, Cd, Cu, Cr, Mg, Mn, Ni, Pb and Zn concentrations between sediment and water from estuary and port

I. Bejarano-Ramirez, Jose M. Jurado, R. Muñiz-Valencia, Á. Alcázar, more

International Journal of Environmental Science and Technology > 2017 > 14 > 6 > 1333-1342

The contents of As, Cd, Cu, Cr, Mg, Mn, Ni, Pb and Zn have been determined in sediment and water samples from Valle de las Garzas estuary and Port Manzanillo (Colima, Mexico) using ICP-AES. The concentrations of these elements were used for a comparative study to determine the distribution of heavy metals and to evaluate which elements reflect natural or anthropogenic backgrounds. For this purpose,...

article

GC–MS method for pesticide in fruit sample

V.C. Salvatierra-Stamp, N.S. Pano-Farias, S.G. Ceballos-Magaña, R. Muñiz-Valencia, more

Toxicology Letters > 2016 > 259 > S > S90-S91

article

Pesticides determination in fruit samples using SFC-DAD

N.S. Pano-Farias, S.G. Ceballos-Magaña, J. Gonzalez, J.M. Jurado, more

Toxicology Letters > 2016 > 259 > S > S90

article

Application to animal feed samples

R. Muñiz-Valencia, R. Gonzalo-Lumbreras, A. Santos-Montes, R. Izquierdo-Hornillos

Analytica Chimica Acta > 2008 > 611 > 1 > 103-112

An isocratic HPLC method for the determination with screening purposes of anabolic androgenic steroids (AASs: fluoxymesterone, boldenone, nortestosterone, metandrostenolone, norethindrone, methyltestosterone and bolasterone), used as growth promoting agents, in finishing pig feed samples has been developed and validated. The separation was achieved by using a reversed-phase Chromolith RP-18e column...

article

A liquid chromatography method using a monolithic column for the determination of corticoids in animal feed and animal feeding water

R. Muñiz-Valencia, S. G. Ceballos-Magaña, R. Gonzalo-Lumbreras, A. Santos-Montes, more

Analytical and Bioanalytical Chemistry > 2008 > 391 > 7 > 2683-2691

An HPLC-DAD method for determining corticoids in calf feed and in animal feeding water samples using a monolithic column has been developed and validated. The method optimization included the study of binary mobile phases of water and acetonitrile. The optimum separation was achieved at 40 °C, with acetonitrile:H₂O 29:71 v/v used as mobile phase and a 3 ml/min flow-rate, which resulted in their separation...

article

Application to animal feed samples

R. Gonzalo-Lumbreras, R. Muñiz-Valencia, A. Santos-Montes, R. Izquierdo-Hornillos

Journal of Chromatography A > 2007 > 1156 > 1-2 > 321-330

A LC isocratic separation study of a complex mixture containing 18 steroids (corticoids and anabolics), used potentially as growth promoters, was carried out. For this purpose, using a Hypersil ODS column at controlled temperature, mobile phases (from binary to quaternary) prepared from water and MeOH, ACN or THF as organic modifiers and UV detection at 245nm, were employed (dehydroepiandrosterone...

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