ABSTRACT The organic ligand 5-{[2-(4-Bromobenzyl)-1H-benzimidazol-1-yl]methyl}-N-methyl-1,3,4-thiadiazol-2-amine (BOBTA) was utilized for the first time as an efficient co-precipitant for the development of a unique co-precipitation technique without addition of a carrier element to separate and preconcentrate the Cu(II) and Cd(II) ions from water samples. The recovery efficiency of the analyte ions was researched in terms of significant experimental factors including solution pH, BOBTA quantity, waiting time, centrifuge speed and duration and sample volume. These parameters were optimized as 8.0, 2.0 mg, 5 min, 3000 rpm, 1 min, and 100 mL, respectively. The developed system displayed outstanding performance in ascertaining the Cu(II) and Cd(II) levels in water samples. Under the optimum experimental conditions, the limits of detection (LODs) were 1.23 and 1.92 μg L-1 for Cu(II) and Cd(II) ions, respectively while the preconcentration factor (PF) was 40 and the relative standard deviations (RSDs) were <3.6% for both metal ions. Consequently, the method was applied to stream and sea water samples for the quantitation of their Cu(II) and Cd(II) levels without any significant matrix effects.
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