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Preconcentration Mini Column Technique For The Determination Of Cu (II) In Water And Alloy Samples With Spectrophotometry

P.Chiranjeevi, C.Sivani, K.Jayaveera, G.R.K.Naidu, J.Dilip Kumar

4-amino methyl pyridine anchored silica gel (4-AMPS) was used as a sorbent in a simple sensitive spectrophotometry determination of Cu (II) in various samples using piperazine dithiocarbamate as a color developing agent (λmax 420 nm) at pH 5.0 ± 0.2. Beer’s law was obeyed over the range of 0.2 -13 μg ml-1. The molar absorptivity and Sandell’s sensitivity were 0.5731 × 105 l mol-1cm-1 and 0.002280 μg cm-2 respectively. Under these conditions, the preconcentration factor obtained was 80, and the detection limit achieved was 5.0 ng ml-1. The detailed study of various interfering ions made the method more sensitive and selective. The recovery of Cu(II) from various samples range from 94.20 to 99.10 %. The present method was successfully applied for the determination of Cu(II) in various water and alloy samples. The proposed method was compared with reported methods in terms of Student’s ‘T’-test and Variance ratio ‘F’-test which indicates that there is no significant difference between proposed and literature method at 95 % confidence level.