equipped with a copper hollow cathode lamp furnished
by own Perkin-Elmer. The equipment was operated
at standard conditions recommended by the manufacturer.
The wavelength was set at 324.8 nm, the lamp current was
adjusted to 10 mA and a lean-blue air–acetylene flame was
employed (air, 13 l min−1; acetylene, 2.5 l min−1). Transient
peaks obtained were registered with a x–y graphic recorder
supplied by Equipamentos Cientificos do Brasil (Curitiba,
Brazil). The pH measurements and adjustments were carried
out in an Analyser 300 (S˜ao Paulo, Brazil) apparatus equipped
with a combined glass electrode. A Gilson Minipuls 3 (Villiers
le Bel, France) peristaltic pump provided with flexible
PVC tubes was used to propel the solutions. A Rheodyne
5041 (Cotati, CA, USA), six-port rotary valve was used to
select preconcentration or elution steps. The system manifold
was built of PTFE tubes with 0.5mm i.d. and connections
made of PEEK.
equipped with a copper hollow cathode lamp furnished
by own Perkin-Elmer. The equipment was operated
at standard conditions recommended by the manufacturer.
The wavelength was set at 324.8 nm, the lamp current was
adjusted to 10 mA and a lean-blue air–acetylene flame was
employed (air, 13 l min−1; acetylene, 2.5 l min−1). Transient
peaks obtained were registered with a x–y graphic recorder
supplied by Equipamentos Cientificos do Brasil (Curitiba,
Brazil). The pH measurements and adjustments were carried
out in an Analyser 300 (S˜ao Paulo, Brazil) apparatus equipped
with a combined glass electrode. A Gilson Minipuls 3 (Villiers
le Bel, France) peristaltic pump provided with flexible
PVC tubes was used to propel the solutions. A Rheodyne
5041 (Cotati, CA, USA), six-port rotary valve was used to
select preconcentration or elution steps. The system manifold
was built of PTFE tubes with 0.5mm i.d. and connections
made of PEEK.
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