2.2. FIA system manifold
The FIA system has an eight channel peristaltic pump (Ismatec
IPC-08, Glattzbrugg, Switzerland) provided with Tygon®tubes to
propel the flow, and polyethylene tubes of 0·8 mm of internal diameter
(i.d.) to conduct the fluids. The commutator and all connections
are acrylic lab-made. An atomic absorption spectrometer (Thermo
Scientific, iCE 3000) was used to measure the absorbance. For the