Studi Kopresipitasi Co(II) Menggunakan Kopresipitan Al(OH)3 Secara Spektrofotometri Serapan Atom (SSA)
Abstract: Has conducted
research on the study of coprecipitation Co(II) using copresipitan Al(OH)3by
Atomic Absorption Spectrophotometry. This study aims to find the optimum
conditions such as pH coprecipitation, volume of coprecipitan and the volume of
nitric acid as eluent and to see efect of Ni(II) to coprecipitation Co(II).
Results of analysis using SSA coprecipitation prove that the optimum conditions
obtained in a relatively at base pH of the solution that is pH 8, where the
condition is colloidal Al(OH)3 formed maximum. At acidic pH colloid formation
process is not maximized, while at higher pH colloids formed will dissolve
again into tetra hidroksoaluminat ions. Maximum Coprecipitan volume occurs at
12 mL Al3+ 0,2 M, which is the case in vulome maximum absorption of Co2+ 50 mL 1 ppm by 2,0 mmol colloidal
Al(OH)3while at higher volumes there is a reduction of the metal cation uptake
due to competition between the Al metal is more electropositive and have
fingers ion is smaller than the cations Co(II). The optimum conditions of
volume nitric acid as eluent occurred on
volume of 1 mL with absorption capacity by Al3 was 0.0905 mg / g, where as in
the volume of eluent managed to extract maximum metal cations while the volume
is higher dilution solution causes a decrease in the concentration of metal
cations soluble in the eluent. The addition of nickel metal ions affect
coprecipitation of metal kobalt because
cobalt and nickel is a 3d transition
which has a tendency of the same characteristic.
Penulis: Monika Yulia, Indang
Dewata, Edi Nasra
Kode Jurnal: jpkimiadd130530
