generator. In this work, the cold vapor generator for MIP OES determination
is illustrated in Fig. 1. In the first channel, a 10% (w/v) SnCl2
was suctioned entering through the top of multi-mode sample introduction
system (MSIS). The second channel was linked to a connection
with two inputs and one output (T-type) before and after the peristaltic
pump, to suction the sample and a 10 mol L−1 HCl solution. A flowcontrol
(restrictor of catheter)was inserted in the HCl solution channel. The
mixture of sample and HCl solution is introduced through the bottomof
MSIS, at which occurs the reaction with 10% (w v−1) SnCl2 solution to
generatemercury vapor that is carried to the torch formed by nitrogen.
The third channel was used to discharge the residual solutions fromthe
MSIS. Tables 1 and 2 present the operating conditions for each equipment.
The instruments were operated under the conditions recommended
by the respective manufacturers. The MSIS spray chamber
was pre-conditioned for 15 s (stabilization time in Table 2) using the
acid and reducing agent solutions (washing step) before the next sample
introduction. The analytical frequency was around 80 samples per
hour.
Ultra-pure water used in the analytical stages, as well as the water
employed during the cleaning of material and used to prepare solutions,
was obtained by a Gehaka-Master-System deionization equipment
model OS 20LX, presenting resistivity higher than 18 M Ω-cm.
generator. In this work, the cold vapor generator for MIP OES determination
is illustrated in Fig. 1. In the first channel, a 10% (w/v) SnCl2
was suctioned entering through the top of multi-mode sample introduction
system (MSIS). The second channel was linked to a connection
with two inputs and one output (T-type) before and after the peristaltic
pump, to suction the sample and a 10 mol L−1 HCl solution. A flowcontrol
(restrictor of catheter)was inserted in the HCl solution channel. The
mixture of sample and HCl solution is introduced through the bottomof
MSIS, at which occurs the reaction with 10% (w v−1) SnCl2 solution to
generatemercury vapor that is carried to the torch formed by nitrogen.
The third channel was used to discharge the residual solutions fromthe
MSIS. Tables 1 and 2 present the operating conditions for each equipment.
The instruments were operated under the conditions recommended
by the respective manufacturers. The MSIS spray chamber
was pre-conditioned for 15 s (stabilization time in Table 2) using the
acid and reducing agent solutions (washing step) before the next sample
introduction. The analytical frequency was around 80 samples per
hour.
Ultra-pure water used in the analytical stages, as well as the water
employed during the cleaning of material and used to prepare solutions,
was obtained by a Gehaka-Master-System deionization equipment
model OS 20LX, presenting resistivity higher than 18 M Ω-cm.
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