A GBC flame atomic absorption spectrometer (FAAS) model
Avanta (Australia) fitted with a silver hollow cathode lamp
(Unicam, Franklin, MA) was used to perform atomic absorption
measurements. The wavelength of 328 nm, lamp current of
4 mA and spectral band pass of 0.50 nm were used throughout.
An air-acetylene flame was used for the determination of
the Ag(I). A Metrohm 632 (Switzerland) pH-meter was used
to measure pH with a combined glass electrode. A model
BHG HERMLE centrifuge (Germany) was used for the phase
separation.