Spectrofluorometric determination and chemical speciation of trace concentrations of tungsten species in water using the ion pairing reagent procaine hydrochloride

A Chronoamperometric Screen Printed Carbon Biosensor Based on Alkaline Phosphatase Inhibition for W(VI) Determination in Water, Using 2-Phospho-l-Ascorbic Acid Trisodium Salt as a Substrate

“…For instance, it has been reported recently that tungsten as a trace element is toxic to people and animals, such as 5 μg·kg −1 of tungsten led to the death of animal embryos [ 2 , 6 , 7 ]. Other studies have shown that dissolution of metallic tungsten particles may cause adverse environmental effects such as soil acidification as well as direct and indirect toxic effects in plants, soil microorganisms and invertebrates.…”

“…There are many techniques to analyse tungsten in environmental samples; mostly spectrophotometric methods such as Atomic Absorption and ICP-OES, as well as voltammetric and polarographic methods have been used [ 2 , 3 , 9 – 11 ]. The application of enzyme biosensors for determining toxic compounds is a dynamic promising research trend, because the associated analytical systems are simple, rapid and selective for amperometric, potentiometric or conductimetric techniques.…”

3,5-Dihydroxy Benzoic Acid-Capped CaF2:Tb3+ Nanocrystals as Luminescent Probes for the WO42– Ion in Aqueous Solution

“…For example, El-Shahawi et al reported the determination and chemical speciation of trace concentrations of the WO 4 2− ion (LOD = 7.51 μg L −1 ) using the ion pairing reagent (procaine hydrochloride). 25 Besides, the luminescence detection based on the lanthanide-doped materials is more advantageous than using organic molecules. This is because, the lanthanide ion shows intraconfigurational 4f → 4f transitions resulting in sharp absorption and emission bands over a wide UV−vis− NIR region, large spectral shift of the emission bands versus the absorption once, and long excited state lifetimes.…”

“…Using the luminescence method, one can perform the detection studies in both the solution and solid state. − However, there are only very few reports on WO 4 2– ion sensing using luminescence methods. For example, El-Shahawi et al reported the determination and chemical speciation of trace concentrations of the WO 4 2– ion (LOD = 7.51 μg L –1 ) using the ion pairing reagent (procaine hydrochloride) . Besides, the luminescence detection based on the lanthanide-doped materials is more advantageous than using organic molecules.…”

A Novel Solid Platform–Based Ag Nanoparticles Chemically Impregnated Activated Carbon for Selective Separation of Tungstate Species in Water: Kinetics and Thermodynamic Study

“…(Sun and Li 2015;Strigul 2010;Parizanganeh et al 2014;Gunawardena et al 2015). Heavy metal ions are not biodegradable and/or photodegradable, and their potential toxicity in the aquatic environment depends on their chemical forms (El-Shahawi and Al Khateeb 2012). Tungsten is typically extracted from these ores in the form of tungstate (WO 4 −2 ) (Nordberg et al 2014;Datta et al 2017).…”