Sensitive method for the determination of molybdenum in natural groundwater at sub-ppb levels using DLLME coupled with ETAAS

Dublin Core

Título

Sensitive method for the determination of molybdenum in natural groundwater at sub-ppb levels using DLLME coupled with ETAAS

Tema

ANALISIS QUIMICO
MOLIBDENO
AGUAS SUBTERRANEAS
BIBLIOGRAFIA NACIONAL QUIMICA
2017

Abstract

Molybdenum is an essential trace element of biological and environmental relevance. Monitoring its content in water sources is very important from the standpoint of health and environment. Given the very low concentrations of Mo in water, it is necessary to use highly sensitive techniques such as ICP-MS or elaborate methods including preconcentration prior to detection. In this work, a new method for the determination of molybdenum in groundwater was developed, incorporating a preconcentration step based on dispersive liquid–liquid microextraction (DLLME) prior to detection by electrothermal atomic absorption spectrometry (ETAAS). After the injection of a ternary mixture formed by an aqueous solution of the complexing agent (potassium ethyl xanthate) and extraction and dispersion solvents (carbon tetrachloride, acetonitrile), the formation of the Mo–xanthate complex occurs followed by its extraction in fine droplets of carbon tetrachloride. After separating the phases the molybdenum content is measured by ETAAS. Several experimental parameters were optimised and the method was validated, presenting a detection limit (3s/b) of 0.017 μg L−1, a quantification limit (10s/b) of 0.062 μg L−1, and an enrichment factor of 165 for a sample volume of 6.0 mL. The calibration curve was linear in the range of 0.06–1.1 μg L−1, the precision (repeatability, sr (%), n = 10) was 2.98% at 0.1 μg L−1 and the recovery of spiked samples was 98.5–103%. This method was successfully applied to the determination of molybdenum in groundwater and the results were found to be equivalent to those obtained by ICP-MS.

Autor

Tissot, Florencia

Fuente

Analytical Methods v. 9, 2017. -- p. 1755-1761

Editor

Royal Society of Chemistry

Fecha

2017

Derechos

Información sobre Derechos de Autor

(Por favor lea este aviso antes de abrir los documentos u objetos)

La legislación uruguaya protege el derecho de autor sobre toda creación literaria, científica o artística, tanto en lo que tiene que ver con sus derechos morales, como en lo referente a los derechos patrimoniales con sujeción a lo establecido por el derecho común y las siguientes leyes (LEY 9.739 DE 17 DE DICIEMBRE DE 1937 SOBRE PROPIEDAD LITERARIA Y ARTISTICA CON LAS MODIFICACIONES INTRODUCIDAS POR LA LEY DE DERECHO DE AUTOR Y DERECHOS CONEXOS No. 17.616 DE 10 DE ENERO DE 2003, LEY 17.805 DE 26 DE AGOSTO DE 2004, LEY 18.046 DE 24 DE OCTUBRE DE 2006)

ADVERTENCIA - La consulta de este documento queda condicionada a la aceptación de las siguientes condiciones de us

Formato

PDF

Idioma

Inglés

Tipo

Artículo

Identificador

DOI: 10.1039/C6AY03459D

Document Item Type Metadata

Original Format

PDF
Fecha de agregación
June 29, 2017
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
Etiquetas
, ,
Citación
Tissot, Florencia, “Sensitive method for the determination of molybdenum in natural groundwater at sub-ppb levels using DLLME coupled with ETAAS,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed March 29, 2024, https://riquim.fq.edu.uy/items/show/4636.
Archivos