Determination of Trace Amounts of Copper and Lead by Tungsten Metal Furnace Atomic Absorption Spectrometry after Preconcentration with Activated Carbon Impregnated with 1,2-Cyclohexanediondioxime

Abstract

A simple and rapid determination method for trace amounts of copper and lead in water and rock samples by tungsten metal furnace atomic absorption spectrometry was investigated. Copper and lead were quantitatively collected on activated carbon impregnated with 1,2-cyclohexanediondioxime (AC-Dox) at pH 5.0 for copper and pH 8.0 for lead. The copper and lead collected on an AC-Dox were eluted with 1 mol dm -3 hydrochloric acid, and the absorbances of the eluents were measured at 324.8 nm for copper and 283.3 nm for lead, respectively. The detection limit (S/N=3) for copper was 0.013 mg/5.0 cm 3 and that for lead was 0.075 mg/5.0 cm 3 . The relative standard deviations (n=5) were 2.0 -4.0% for each metal.

Determination of Lead in Different Samples by Atomic Absorption Spectrometry after Preconcentration with Dithizone Immobilized on Surfactant-Coated Alumina

“…[6][7][8][9] Much interest has been shown recently in replacing conventional liquid-liquid extraction with solid-phase extraction techniques, [10][11][12][13][14] owing to its high enrichment capability and operational simplicity. The effectiveness and versatility of immobilized water-insoluble chelating agents on surfactant coated alumina have been demonstrated.…”

Determination of Pb(II) and Cu(II) by Electrothermal Atomic Absorption Spectrometry after Preconcentration by a Schiff Base Adsorbed on Surfactant Coated Alumina

“…The values of LOD of reported methods in literature are higher than our work, thus better LOD has been achieved with BSAE impregnated admicelles. 15,20,[30][31][32][33] The reproducibility of the method for extraction and determination of 100 ng of each cation in a 50 mL of solution was examined. As the results of seven individual replicate measurements indicated, the errors were 2.77% and 2.46% for Pb(II) and Cu(II) respectively.…”

“…11 An example for the first type is the use of ammonium pyrrolidine dithiocarbamate as a chelating agent for metals, followed by adsorption of the resulting complex on a mixture of C 60 and C 70 , which is then eluted with ethanol (80%, V/V). 12 Some examples of the second type are, using silica gel functionalized with methylthiosalicylate, 13 Sephadex C-50 modified with mercaptoacetic acid, 14 C-18 disk loaded with a ligand, [15][16][17] silicagel modified with 3-aminopropyltriethoxysilane, 18 co-crystallized naphthalene alizarin, 19 activated carbon impregnated with 1,2-cyclohexanedioxime, 20 or activated carbon loaded with 5-(4-heptyloxyphenyl)azo-N-(4-propyloxyphenyl)-salicylidenamine]. 21 Alumina is a very versatile sorbent and can be tailored for specific applications.…”

Simultaneous Preconcentration of Copper, Nickel, Cobalt and Lead Ions Prior to Their Flame Atomic Absorption Spectrometric Determination

“…Solid phase extraction procedures based on sorption of metal complexes on various support, such as silica gel, alumina and activated carbon in the two past centuries have been widely used for this purpose, among which activated carbon has been widely applied. The reasons for widespread application of the activated carbon as a trace collector for metal ion preconcentration [9][10][11][12][13][14][15][16] are strong interaction and quantitative adsorption of molecules with π electrons on activated carbon 17 . Because activated carbon is a type of hydrophobic adsorbent which adsorbs non-polar or little polar substances in aqueous solutions, metal ions to be preconcentrated need to be transformed in corresponding metal chelates [18][19][20][21] .…”