title: Determination of Co(II) in water and soil samples using spectrophotometry coupled with preconcentration on 4-amino methyl pyridine anchored silica gel column.
abstract: 4-amino methyl pyridine anchored silica gel (4-AMPS) was used as a sorbent in a simple sensitive spectrophotometry determination of Co(II) in various samples using piperazine dithiocarbamate as a color developing agent (lambda(max)=390 nm) at pH 5.0+/-0.2. Beer's law was obeyed over the range of 0.1-5.0 microg ml(-1). The molar absorptivity and Sandell's sensitivity were 1.257x10(5) lmol(-1) cm(-1) and 0.006145 microg 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 Co(II) from various samples range from 97.50 to 99.66%. The present method was successfully applied for the determination of Co(II) in various water and soil 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.
authors.affiliation: Department of Environmental Sciences, S.V. University, Tirupati 517502, A.P., India.
authors.forename: C
authors.initials: C
authors.lastname: Sivani
authors.forename: G
authors.initials: G
authors.lastname: Ramakrishna Naidu
authors.forename: J
authors.initials: J
authors.lastname: Narasimhulu
authors.forename: D
authors.initials: D
authors.lastname: Rekha
authors.forename: J
authors.initials: J
authors.lastname: Dilip Kumar
authors.forename: P
authors.initials: P
authors.lastname: Chiranjeevi
mesh_terms: D000327:Adsorption; D002219:Carbamates / Q000737:chemistry; D003035:Cobalt / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D010880:Piperidines / Q000737:chemistry; D058428:Silica Gel; D012822:Silicon Dioxide / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D013053:Spectrophotometry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D002219:Carbamates; D010880:Piperidines; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D003035:Cobalt; D058428:Silica Gel; D012822:Silicon Dioxide