… After the ion preconcentration process, the enriched solution was detected by ultraviolet
and visible spectrophotometer (UV–Vis). Then, the concentration of heavy metal …

… by coprecipitation with cobalt (II) hydroxide for a final determination by X-… preconcentration
procedure using Co 2+ for coprecipitation of copper, nickel, manganese and cadmium ions …

… Preconcentrations of Cu(II), Ni(II) and Pb(II) ions by using … Effects of important parameters
on preconcentration … Among the trace ions zinc, iron, cobalt, magnesium, molybdenum…

… of atomic absorption instrument on lead and cadmium ions, so this … the simultaneous extraction
and pre-concentration of lead ions … ions impose no considerable impact on simultaneous …

… ions may be toxic and lead to side effects. High amounts of … It is noteworthy to mention that
the metal content in water can … using TA-DLLME as a pre-concentration technique. Various …

… In addition, heavy metal detection in drug preparations is significant in risk assessment,
so it is clear that metal ion content needs to be monitored. The International Council for …

… temperature on extraction efficiency of lead, cobalt, nickel and manganese were optimized.
… oil samples and waste oils with different properties for the determination of analyte contents. …

… Then the ions content was determined according to the … highest performance in prediction
of Cu 2+ and Ni 2+ concentration. … for simultaneous determination of copper, nickel, cobalt and …

… Dispersive liquid-liquid microextraction based on solidification of floating organic drop for
simultaneous separation/preconcentration of nickel, cobalt and copper prior to determination …

… Furthermore, the effective contact of the elution solvent and the sorbent containing metal
ions leads to more interaction of the analytes with the solvent and definitely the analytes elution …