Development of a New and Facile Carrier Element-Free Coprecipitation Procedure for Separation, Preconcentration and Sensitive Determination of Cu(II) and Cd(II) Ions in Water and Vegetable Samples

Taking a deeper look into the roles of amines in atomic absorption spectrometry

“…A coprecipitation procedure using a multi-nitrogen compound, 2-(2-(2-(4-bromobenzyl)-1H-benzo[d]imidazole-1-yl) acetyl)-N-ethylhydrazine-1-carbothioamide, allows us to determine traces of Cu (II) and Cd (II) in vegetables and water by FAAS. 119 The best preconcentration condition was at pH 8.0 with LODs of 0.51 and 2.28 mg L −1 for Cu (II) and Cd (II) , respectively. Another study used TEA to assist Mg(OH) 2 coprecipitation to preconcentrate Cd (II) from seawater by an optimised polystyrene-coated magnetic NP-based dispersive solid phase extraction method at pH 6.5.…”

“…117 The synthesis and application of a restricted-access poly(protoporphyrin-co-vinyl pyridine) macromolecule (sorbent) to preconcentrate Cu (II) in water samples and bovine milk only depend on pH adjustment (pH 6.0), avoiding the time-consuming use of concentrated acids in a microwave-assisted acid digestion procedure. 118,119 The restricted access arises from the hydrophilic compound 2hydroxyethyl methacrylate. This method preconcentrates Cu (II) ions using an FI system, buffered with 0.05 M of Britton-Robinson (BR) at pH 6.0, and using a mini-column, packed with 50.0 mg of sorbent and a ow rate of 14.0 mL min −1 .…”

Atomic spectrometry update: review of advances in the analysis of clinical and biological materials, foods and beverages

“…It should be noted that the reagent is not commercially available. In the second paper, Duran et al 68 reported a very similar procedure for the FAAS determination of Cu and Cd in vegetables (lettuce, parsley, carrot and tomato) and waters (stream and sea), in which the precipitant (also not commercially available) was 2-(2-(2-(4-bromobenzyl)-1 H -benzo[ d ]imidazole-1-yl)acetyl)- N -ethylhydrazine-1-carbothioamide (BIMANEC), added as a 0.2% solution in EtOH and DMSO (1 + 1). The LODs were 2.3 and 0.51 μg L −1 for Cd and Cu, respectively.…”