Procedimento lab

Journal of Arid Environments, 1995

Division of Plant Physiology, IARI, New Delhi, 2017

Plant species, age, plant part and the time of sampling can affect the values of mineral nutrients present in a given sample. Besides this, the option used for the digestion of plant sample is also very important. So, for taking up the analysis of mineral nutrients in plant samples and getting the accurate and realistic results, proper and careful sampling and selection of digestion method are some of the very important considerations. Most of the essential elements are not equally distributed in the plant or within the plant parts. Although, it is possible to assay any plant part or even the whole plant but the biological significance of such an analysis always depends on the availability of interpretative data from the plant part(s) collected and used for the analysis. While conducting a plant analysis, primary objective should be to obtain the plant part for which assay results in actual comparison of plant samples coming from different types or stress treatments. Prior to elemental analysis, possible errors can occur at various stages such as; sample collection, initial handling, transportation, decontamination, drying, particle size reduction etc. Thus, possible sources of error must be known to the investigator for the accuracy of the whole procedure and the analysis. The sampling procedures and precautions required at various stages of sample preparation for the analysis of mineral nutrients are described here in this article.

Agrociencia

Las técnicas para analizar los elementos esenciales o tóxicos para las plantas y los seres humanos, ha experimentado un acelerado desarrollo en los últimos tiempos, tanto en las convencionales o clásicas, que requieren la solubilización de la muestra, como en otras emergentes que no la requieren. Las técnicas convencionales avanzadas y las no destructivas se usan poco por los investigadores en genética, agronomía, nutrición, fisiología, biología, para evaluar la composición y calidad nutrimental de alimentos, cuantificar elementos metálicos esenciales y tóxicos, diagnosticar el estado nutrimental de los cultivos y estudiar alimentos funcionales. Estas técnicas analíticas se pueden aplicar, además, a suelos, abonos y fertilizantes. El objetivo de este ensayo es difundir las posibilidades de aplicación y los principios básicos de estas técnicas analíticas emergentes. La espectrometría de emisión por atomización con plasma inductivamente acoplado (ICP, Inductively coupled plasma) y la ...

Canadian Journal of Forest Research, 1993

Pakistan Journal of Chemistry, 2021

Sustainability

The question of trace metal elements (TME) is still relevant and causes several environmental problems. Moreover, the digestion methods of TME have a significant impact on ecosystems. Sample preparation is an important step of any analytical procedure. In fact, defining the levels of TME in vegetal tissues requires various steps: drying samples, crushing, extraction, and dosage. The use of chemical extraction solutions can be put into question. Other than their lack of specificity, they are susceptible to provoking the redistribution and/or re-fixation of a part of the metallic ions between the various vegetal components. Our study aims to test the procedures of extraction that are specific for the metals Cu, Zn, Fe, Ca, Cr and Ba. Our results show an outstanding difference in the levels of TME derived from the same vegetal sample, according to the various techniques of extraction. In fact, cold extraction by nitric acid diluted at 10% is the most efficient way to put the ions of Cu...

Environments

Trace elements (As, Cd, Cr, Pb, Ba, Fe, Al, Mn and Ba) were uptaken by the leaves of the creosote bush (Larrea tridentata (DC.) Coville) in Nelson, Nevada, although at low concentrations. Samples were collected up-gradient of the mine tailings, the tailings, and down gradient from the source to measure spatial distribution. Data show that trace elements (As, Ba, Cr, Hg, Se) enter L. tridentata through root tissues, migrating to leaf tissue, but at significantly lower levels than that of the source sediments. Metalloid (As and Se) concentrations in the leaf tissues ranged from non-detect to greater than 44 mg kg−1 As and non-detect to over 34 mg kg−1 Se. For trace metals, Hg ranged from non-detect to 0.14 mg kg−1; Ba from 1.74 to 4.12 mg kg−1; and Cr from non-detect to 6.18 mg kg−1 while Ag, Cd, and Pb were not detected in the plant leaves. When comparing the ratio of sediment metal concentration to plant metal concentrations, the Techatticup Wash contained the highest levels of trac...

Analytical Letters, 2018

Environmental Monitoring and Assessment, 2006

Nutrition & Food Science, 2009