Solvent Extraction of Copper (I) and (II) as Thiocyanate Complexes with Tetrabutylammonium Ions into Chloroform and with Trioctylphosphine Oxide into Hexane

Chemically modified activated carbon with 1-acylthiosemicarbazide for selective solid-phase extraction and preconcentration of trace Cu(II), Hg(II) and Pb(II) from water samples

“…The recovery data of Cu(II), Hg(II) and Pb(II) were given in Table 2. It is clear that in excess of 1000 g mL −1 of K + , Na + , Ca 2+ , Mg 2+ , Cl − , 400 g mL −1 of SO 4 2− , HPO 4 2− , and 100 g mL −1 of Zn(II), Cd(II), Mn(II), Ni(II), Co(II), these ions did not significant interfere with the determination of the analytes. The recoveries of Cu(II), Hg(II) and Pb(II) were not less than those in the absence of coexisting ions, indicating that AC-ATSC had a high selectivity towards Cu(II), Hg(II) and Pb(II) and present a potential to apply to analyze real samples.…”

“…The traditional separation/preconcentration methods for removing heavy metals include liquid-liquid extraction [4], ionexchange [5] and chemical precipitation [6], etc., but these methods are usually time consuming and require relatively large volumes of high purity solvents. Recently solid-phase extraction (SPE) has been widely used for preconcentration of heavy metals due to advantages such as, high enrichment factor, high recovery, rapid phase separation, low consumption of organic solvents and the ability of combination with different detection techniques in the form of on-line or off-line mode [7,8].…”

Tris(2-aminoethyl) amine functionalized silica gel for solid-phase extraction and preconcentration of Cr(III), Cd(II) and Pb(II) from waters

“…The traditional separation and preconcentration methods for metal ions include liquid-liquid extraction [5], coprecipitation [6] and ion-exchange [7], etc. These methods often require large amounts of high purity organic solvents, some of which are harmful to health and cause environmental problems.…”

Chromium(VI) Removal Using Biosorbents Derived from Moringa Oleifera

“…They are so many methods for removal of Chromium from ground water. The methods are oxidation with chlorine and potassium permanganate treatment with limestone, liquid-liquid extraction, ion exchange, chemical precipitation, bioremediation, use of activated carbon and other filtering materials [7][8][9][10][11][12][13].…”