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A Synopsis of Pterostemon (Iteaceae), a Group Endemic to mexico

American Journal of Plant Sciences 2013年第12期4卷 1-9页

作者： judith márquez guzmán martha martínez Gordillo Ramiro Cruz Durán Jaime Jiménez Ramírez maría Cristina Pérez-Amador Departamento de Biología Comparada Facultad de Ciencias Universidad Nacional Autónoma de México México D.F. México Laboratorio de Desarrollo en Plantas Facultad de Ciencias Universidad Nacional Autónoma de México México D. F. México Laboratorio de Química Facultad de Ciencias Universidad Nacional Autónoma de México México D. F. México

The genus Pterostemon Schauer (Iteaceae), is a group of three species restricted in distribution to mexico. It includes: Pterostemon mexicanus Schauer, P. rotundifolius Ramírez, and P. bravoanus J. Jiménez-Ram. & martínez Gordillo. On the basis of field observations and herbarium specimens, we review the morphology (vegetative and reproductive), and distribution to give an updated taxonomic treatment for the genus. Additionally the utility of morphological characters is evaluated for taxomic use, and detailed taxonomic descriptions and ecological associations are given for each species.

关键词： Endemic mexico Pterostemon Iteaceae

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Heavy metals monitoring in Sediments from Lerma River in West-Central mexico

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American Journal of Analytical Chemistry 2018年第2期9卷 77-87页

作者： Héctor Hernández-mendoza maría judith Ríos-Lugo Elizabeth Teresita Romero-guzmán Lázaro Raymundo Reyes-Gutiérrez michael E. Ketterer Instituto nacional de Investigaciones nucleares Ocoyoacác México Universidad del Centro de méxico San Luis Potosí México Universidad Autónoma de San Luis Potosí San Luis Potosí México División of Ciencias Básicas e Ingeniería Departmentof Recursos de la Tierra Universidad Autónoma Metropolitana-Lerma (UAM-L) Lerma México Department of Chemistry Metropolitan State University of Denver Denver USA

The aim of this work was to carry out monitoring of some elements considered toxic in sediments from Lerma River. An analytical method was optimized in our laboratory for quantification of nickel (ni), cobalt (Co), manganese (mn), arsenic (As), chromium (Cr) and lead (Pb) by using Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). Ten sediments were collected along the Lerma River at variable distances and at 20 cm depth. Samples were heated to 60°C to dryness, followed by separation of particle size using a 74-μ no. 200 mesh for homogeneity purposes. 0.2 g of sample underwent microwave-assisted acid digestion, followed by plate evaporation. The samples were dissolved in 10 mL with HnO3 at 5% v/v for ICP-OES analysis. A certified reference material (CRm 8704) was used to evaluate the method’s accuracy and precision. The method showed linearity, precision, accuracy, and limits of quantification and detection acceptable for protocol validation of analytical method. The average results obtained in recovery of CRm 8704 were ~90% and precision was below 7% for all elements. Levels concentration of As, Cr, Pb show high pollution in A1, A7 and A8 sites. Therefore, Co, mn and ni can be considered in this study as normal values. In conclusion, concentration levels of As, Cr, Pb in sediments were high according to US-EPA and nOm-147-SEmARnAT/SSA1-2004. The presence of these heavy metals in Lerma River could be due mainly for the emitted from industries, such as pharmaceutical, automotive, metal mechanics and tannery, and urban residual water. Finally, the method developed using ICP-OES has enabled monitoring of these elements in sediments from Lerma River, with possible applications in a routine analytical laboratory.

关键词： ICP-OES Lerma River Sediments US-EPA

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