Speciation of Dissolved Trace Nickel in Environmental Waters by On-Line Sonodigestion-Flow Injection Solid Phase Extraction Coupled to Flame Atomic Absorption Spectrometry

Abstract

A simple on-line sonodigestion system was successfully used for breakdown organic nickel complexes in environmental waters acidified with diluted nitric acid prior to flow injection total dissolved nickel preconcentration in a microcolumn containing a chelating resin (Chelite Che with iminodiacetic acid groups) and determination by flame atomic absorption spectrometry. For the determination of the dissolved labile nickel fraction, microcolumns packed with the chelating resin were loaded in-situ with the sample without sample pH modification, and once in the laboratory were inserted in the flow injection device where nickel elution-detection was carried out. The performance of the chelating resin was investigated in order to elucidate its behavior in the presence of dissolved nickel species. The results obtained reveal that the resin, at the experimental employed conditions, retained only dissolved free nickel ions and nickel bound to weak complexes (labile fraction). The figures of merit for determinations in both nickel fractions are given and the obtained values are discussed. The speciation scheme is applied to the analysis of nickel in river and seawater samples collected in Galicia (Northwest, Spain). The results of fractionation showed that Ni are mainly in the dissolved labile fraction in river water, while in seawater samples analyzed was mainly present in the organic fraction.

A comprehensive review on the sources, essentiality and toxicological profile of nickel

“…This scheme is represented with permission from reference no. 53 . Copyright SciRes 2011 (http://www.SciRP.org/journal/ajac).…”

“…A study in hens revealed that nickel exposure decreased the magnesium, manganese, and zinc levels in various tissues. 53 According to studies, nickel and zinc had antagonistic effects on animals and humans. 36 In addition to its cancer-causing properties, nickel can also cause sensitization reactions in humans (Scheme 2).…”

“…A study in hens revealed that nickel exposure decreased the magnesium, manganese, and zinc levels in various tissues. 53 …”

“…Another study by Mandal and co-workers also supported similar ndings in different water samples of their study. 52 In a recent study by Yebra-Biurrun et al, 53 they have tried to nd out the amount of labile Ni (the actual toxic nickel) in seawater and river water samples. Their simple and effective instrumentation was the combined and continuous sonodigestion and solid-phase extraction of Ni by the use of chelating resin.…”

Ultrasonic supramolecular microextration of nickel (II) as N,N′-Dihydroxy-1,2-cyclohexanediimine chelates from water, tobacco and fertilizer samples before FAAS determination

“…Several procedures for samples pretreatments have been developed including; solid phase extraction [8][9][10][11], cloud point extraction [12], dispersive liquid-liquid microextraction [13,14]. In addition, an online sonodigestion method was applied to extract nickel from water samples before the analysis by flame atomic absorption spectrometry [15].…”