Coprecipitation of Ni2+, Cd2+ and Pb2+ for preconcentration in environmental samples prior to flame atomic absorption spectrometric determinations

Flame atomic absorption spectrometric determination of zinc, nickel, iron and lead in different matrixes after solid phase extraction on sodium dodecyl sulfate (SDS)-coated alumina as their bis (2-hydroxyacetophenone)-1, 3-propanediimine chelates

“…In order to obtain high preconcentration factors, sample volume is a main factor for the preconcentration works [30][31][32][33][34][35]. To determining the sample loading volume, different experiments were performed by contacting the sample volumes, in the range of 50-550 mL at increments of 50 mL of sample solutions at pH 7 containing 50 g of all ions.…”

Flame atomic absorption spectrometric determination of heavy metals in aqueous solution and surface water preceded by co-precipitation procedure with copper(II) 8-hydroxyquinoline

“…A comparison of the proposed co-precipitation procedure in this study with the other reported preconcentration methods for cadmium, nickel, chromium, lead and cobalt ions extraction from water samples are shown in Table 4 (Bulut et al 2010;Feist and Mikula 2014;Soylak and Aydin 2011;Soylak et al 2007Soylak et al , 2008Tuzen and Soylak 2009). Using similar precipitate dissolving media (HNO 3 ), the coprecipitation procedure for metal ions with 8-hydoxyquinoline as a ligand yielded low precipitation factor (PF) compared to those reported in the literatures for which other ligands were used (Table 4).…”

A new coprecipitation method without carrier element for separation and preconcentration of some metal ions at trace levels in water and food samples

“…Other advantages of the coprecipitation method are that separation and preconcentration can be completed in the same step, and several analyte ions can be separated and preconcentrated from the matrix using different inorganic or organic co-precipitants [1]. Metal hydroxides such as zirconium, aluminum, gadolinium, erbium and dysprosium [18][19][20][21][22][23][24][25][26][27][28][29] have been used as inorganic coprecipitants. Organic coprecipitants that are able to form neutral chelates with metallic species such as 8-hydroxyquinoline, pyrrolidine dithiocarbamate, Rubens acid, dibenzyldithiocarbamate, 5-methyl-4-(2-thiazolylazo) resorcinol and violuric acid [30][31][32][33][34][35][36][37][38][39][40][41][42] have been used to preconcentrate trace metal ions from various samples.…”