Fig. 2A presents the analytical response obtained to evaluate the deposition
potential for 50 μg L−1 of Mn(II). The studies were conducted
using the interval of 1.0 to 1.4 V, at which the oxidation of Mn2+ to
MnO2 occurs, based on previous works, as described in reaction 1
[15–17,21]. The greatest potential for determination of manganese
was 1.2 V (better signal response) as illustrated in Fig. 2A. The stripping
of Mn(II) occurs in two steps involving the reduction to MnOOH
(reaction 2) followed by further reduction to Mn2+ (reaction 3). In
this work, the first reduction process that occurred at 0.9 V was used
to determine Mn(II). The electrode conditioning was optimized as
−0.5 V for 30 s, which is in agreement with previous works [15–17,
21]. The deposition timewas evaluated based on the analytical response
for 50 μg L−1 of metal. Fig. 2B presents the analytical signal for SWCSV
measurements. The studies were performed in the range of 0 to 300 s.
For further analyses, it was preferred to select 180 s as deposition time
in order to obtain a good correlation between deposition time and
sensitivity without decreasing the analytical frequency method, which
can be estimated in 14 measurements per hour.
Fig. 2A presents the analytical response obtained to evaluate the depositionpotential for 50 μg L−1 of Mn(II). The studies were conductedusing the interval of 1.0 to 1.4 V, at which the oxidation of Mn2+ toMnO2 occurs, based on previous works, as described in reaction 1[15–17,21]. The greatest potential for determination of manganesewas 1.2 V (better signal response) as illustrated in Fig. 2A. The strippingof Mn(II) occurs in two steps involving the reduction to MnOOH(reaction 2) followed by further reduction to Mn2+ (reaction 3). Inthis work, the first reduction process that occurred at 0.9 V was usedto determine Mn(II). The electrode conditioning was optimized as−0.5 V for 30 s, which is in agreement with previous works [15–17,21]. The deposition timewas evaluated based on the analytical responsefor 50 μg L−1 of metal. Fig. 2B presents the analytical signal for SWCSVmeasurements. The studies were performed in the range of 0 to 300 s.For further analyses, it was preferred to select 180 s as deposition timein order to obtain a good correlation between deposition time andsensitivity without decreasing the analytical frequency method, whichcan be estimated in 14 measurements per hour.
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